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Extended Basic Long format


mizapf

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I need the specification of the Extended Basic "long format" (INT/VAR 254). Although I can list files in TIImageTool in that format, it is not yet complete.

 

This is the beginning of such a file:

000000: 0a ab cd c5 38 ca 2b f0 ed ff e7 ff 00 10 00 11     ....8.+.........
000010: 00 12 00 03 00 13 00 04 00 05 00 06 00 07 00 08     ................
000020: 00 09 00 0a 00 14 00 15 00 00 00 00 00 00 00 00     ................
000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
0000a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
0000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
0000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
0000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
0000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
0000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ................
000100: fe 2f 26 cc 55 2f 1c cc 61 2f 12 cc 69 2f 08 cc     ./&.U/..a/..i/..
000110: 7e 2e fe cb ef 2e f4 cc a4 2e ea cc 16 2e e0 cc     ~...............
000120: bd 2b 52 ca 3e 2b 48 ca 4e 2b 3e ca 6a 2b 34 ca     .+R.>+H.N+>.j+4.
...

So the first bytes look like this:

0x0A, 0xABCD, start of Line Number Table, end of LNT, checksum (-(start XOR end)), memtop

 

But in this first record we then have 0xFF, 0x0010, 0x0011, ..., whose meaning is unclear to me.

 

Do we have some more information on that?

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Never mind ... I guess I found it. Some sleep seems to be a good way to solve problems ... when I lay in bed this morning I thought "oh no, that's a FILE, not a PROGRAM, so ..."

 

0A = length of record

First record: ABCD, startLNT, endLNT, Checksum, Memtop (10 bytes)

FF = last record in this sector; all following bytes are ignored (never read)

 

offset 100:

FE = length of record

2F 26 CC ... Bytes of record

...

 

The reason for this "last record marker" in the first sector is simply that the first record has 10 bytes, and the following record has 254 bytes, which do not fit into one sector, and records cannot cross sectors. The bytes I mentioned above are just some remainders from an earlier operation.

 

Edit: And while we're at it, the values starting at offset 0x101 are the line number table:

 

Line number 0x2F26 (12070) is at address 0xCC55

Line number 0x2F1C (12060) is at address 0xCC61

Line number 0x2F12 (12050) is at address 0xCC69

...

 

So the long format is basically the same as the normal format, except that the addresses refer to CPU RAM locations, not VDP RAM locations.

 

Edit2: What I also found interesting is that the BASIC program lines in memory are ordered as they were typed in, not by their line number. The ordering according to the line number is up to the line number table only. It would be too inefficient to move large memory blocks in order to insert a line that was added later, considering that there is a table which already sorts them.

 

Edit3: The checksum can be negated which turns on the Extended Basic LIST protection. As it seems, the example shown above happened to be LIST-protected. The standard calculation would be startLNT XOR endLNT.

Edited by mizapf
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Yes, you are the one! This file format is on my list to investigate to. The TiDisk-Manager have to know this format too. But currently the work on my tool is paused, because the summer brings me out side and I do a lot of work in the garden (I think the Yanks says back yard).

I'm looking forward to a new post on ninerpedia. Thank you, Michael!

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I have posted the GPL source code on how XB does this. (And RXB source too.)

 

RXB 2015 has a new feature: (EXAMPLE)

 

SAVE DSK2.XBPGMTEST,IV254

 

Works just like:

 

SAVE DSK2.XBPGMTEST,MERGE

 

But loads into normal XB just like Program Image does.

 

Cataloging XB Programs will be much more easy to see and not confuse XB Program Image with EA Program Image files.

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  • 3 months later...

Let's raise this again ... I'm currently implementing the long XB format as well, and I thought I understood the layout.

 

But when I create a small test program using TI Image Tool neither MESS nor Classic99 will load it:

>OLD DSK1.LXB
 * I/O ERROR 20

The raw program data looks like this (including the record length bytes):

 

00000000  0a ab cd ff c6 ff d1 00  17 ff e7 22 00 1e ff d3  |..........."....|
00000010  00 14 ff d7 00 0a ff dc  03 96 49 00 04 9c 49 b3  |..........I...I.|
00000020  00 0c 8c 49 be c8 01 31  b1 c8 02 31 30 00        |...I...1...10.|

 

Other long programs from, say, the TI Game Shelf do work, however.

 

Is there an actual minimum size requirement for long programs? Or what's the missing piece here?

 

lxb.dsk

Edited by ralphb
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Let's raise this again ... I'm currently implementing the long XB format as well, and I thought I understood the layout.

 

But when I create a small test program using TI Image Tool neither MESS nor Classic99 will load it:

>OLD DSK1.LXB
 * I/O ERROR 20

The raw program data looks like this (including the record length bytes):

 

00000000  0a ab cd ff c6 ff d1 00  17 ff e7 22 00 1e ff d3  |..........."....|
00000010  00 14 ff d7 00 0a ff dc  03 96 49 00 04 9c 49 b3  |..........I...I.|
00000020  00 0c 8c 49 be c8 01 31  b1 c8 02 31 30 00        |...I...1...10.|

 

Other long programs from, say, the TI Game Shelf do work, however.

 

Is there an actual minimum size requirement for long programs? Or what's the missing piece here?

 

attachicon.giflxb.dsk

You are correct. Here is the RXB data on:

 

SAVE DSK2.TESTPGM,IV254

 

(This only works in RXB 2015 and no other XB has this feature.)

 

From page 6 RXB 2015 E manual:

 

SAVE FILES IN INTERNAL VARIABLE 254 OR PROGRAM IMAGE FORMAT
_______________________________________________________________
RXB allows XB programs to load or be saved in two formats as
previously, but now RXB allows more control of this feature.
Normally XB will save files in Program Image format if these
programs are small enough to fit in VDP memory. If these XB
programs are larger then what will fit in VDP then XB programs
will be saved in Internal Variable 254 format. RXB has a added
feature added to save command. IV254 is the new feature.
EXAMPLE: SAVE DSK3.TEST,IV254
This is from RXB 2015 E page S1 :
SAVE command PAGE S1
-------------------------------------------------------------
Format SAVE DSK3.PRGM
SAVE DSK2.PRGM,IV254
Description
The SAVE command functions normally to save XB programs.
An additional freature is IV254 may be specified after the
SAVE command to convert to Internal Variable 254 format.
The IV254 format makes it much more easy to tell an XB
program from EA programs when cataloging a disk.
Internal Variable files do take up one sector more then
XB program format. It should be noted that XB programs
smaller then 3 sectors can not be saves in IV254 format.
Command
Saves to DISK 2 in XB program | >SAVE DSK2.TEST
image format TEST |
|
Saves to disk 3 in XB program | >sAVE DSK3.STUFF,IV254
Internal Variable 254 named |
STUFF |
|
Saves to WDS1 in dirctory EXB | >SAVE WDS1.EXB.RB,IV254
XB program Internal Variable |
254 named RB |
| |
Options
Allows better cataloging options for saving XB files.
(As you can see above any program has to have a minimum size or can not be saved in IV254 format.)
Edited by RXB
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The issue is that your BASIC program is too short. When it is long enough to take more than one sector, there won't be any problem.

 

OK, thanks for all the hints, that explains it. Padding is simple enough, so that problem is solved.

 

But unfortunately the loader doesn't really do what I expected, i.e., it doesn't store the program at the address specified in the header. From my observation it seems that the file is loaded as-is at address >A040 and then copied again in memory so that it ends at >FFE7, adjusting the pointers in the line number table on the way.

 

I was hoping for a simple way to to place stuff where I want, but it seems like I need to do another manual move.

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OK, thanks for all the hints, that explains it. Padding is simple enough, so that problem is solved.

 

But unfortunately the loader doesn't really do what I expected, i.e., it doesn't store the program at the address specified in the header. From my observation it seems that the file is loaded as-is at address >A040 and then copied again in memory so that it ends at >FFE7, adjusting the pointers in the line number table on the way.

 

I was hoping for a simple way to to place stuff where I want, but it seems like I need to do another manual move.

Well RXB has

CALL MOVES("RR",NUMBYTES,FROMADDRESS,TOADDRESS)

or

CALL MOVES("V$",NUMBYTES,VDPADDRESS,VARIABLE$)

or

CALL MOVES("GR",NUMBYTES,GROMADDRESS,RAMADDRESS)

 

G=GROM/GRAM ADDRESS

R=RAM ADDRESS

V=VDP ADDRESS

$=STRING VARIABLE

 

I know this would not work in normal XB but then everything is so complicated to do in normal XB.

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What is it that you want to do? Why do you care where the program is kept? There is something you are not telling us.....

 

 

Well, I was adding a feature to my xas99 cross-assembler to embed the generated code in an Extended BASIC program. (There are, of course, quite a few tools which do that already.) When compiling the code myself I can relocate it so that it fits the upper end of the XB token table, and everything works fine.

 

But for arbitrary, existing images I cannot coax the XB loader into placing the tokens where I want them. And fudged header data is noticed by the loader and results in an I/O Error. If it were an actually useful feature I'd add some code to move the image from the token table to the final destination, but it's been more of a plaything anyway ...

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Well, I was adding a feature to my xas99 cross-assembler to embed the generated code in an Extended BASIC program. (There are, of course, quite a few tools which do that already.) When compiling the code myself I can relocate it so that it fits the upper end of the XB token table, and everything works fine.

 

But for arbitrary, existing images I cannot coax the XB loader into placing the tokens where I want them. And fudged header data is noticed by the loader and results in an I/O Error. If it were an actually useful feature I'd add some code to move the image from the token table to the final destination, but it's been more of a plaything anyway ...

In order to do this you are going to have to modify the XB ROMs as the Tables are hardcoded to be at a certain location.

 

So not only would GPL in XB have to be modified but ROM also.

 

A few routines in ROM do this in XB GPL code:

***********************************************************
[0060]               *    Equates for XMLs
[0061] 0000          SYNCHK EQU  >00               SYNCHK XML selector
[0062] 0003          SEETWO EQU  >03               SEETWO XML selector
[0063] 0070          COMPCT EQU  >70               PREFORM A GARBAGE COLLECTION
[0064] 0072          MEMCHK EQU  >72               MEMORY check routine: VDP
[0065] 0074          PARSE  EQU  >74               Parse a value

99/4 GPL-ASSEMBLER (Pass 3) correct                                   PAGE 0002 
EQUATES EDIT-359
[0066] 0077          VPUSH  EQU  >77               Push on value stack
[0067] 0078          VPOP   EQU  >78               Pop off value stack
[0068] 0079          PGMCHR EQU  >79               GET PROGRAM CHARACTER
[0069] 007A          SYM    EQU  >7A               Find Symbol entry
[0070] 007B          SMB    EQU  >7B               Find Symbol table entry
[0071] 007D          SCHSYM EQU  >7D               Search symbol table
[0072] 007E          SPEED  EQU  >7E               SPEED UP XML
[0073] 007F          CRUNCH EQU  >7F               Crunch an input line
[0074] 0081          CONTIN EQU  >81               Continue after a break
[0075] 0083          SCROLL EQU  >83               SCROLL THE SCREEN
[0076] 0084          IO     EQU  >84               IO utility (KW table search)
[0077] 0085          GREAD  EQU  >85               READ DATA FROM ERAM
[0078] 0086          GWRITE EQU  >86               WRITE DATA TO ERAM
[0079] 0087          DELREP EQU  >87               REMOVE CONTENT FROM VDP/ERAM
[0080] 0088          MVDN   EQU  >88               MOVE DATA IN VDP/ERAM
[0081] 0089          MVUP EQU    >89               MOVE DATA IN VDP/ERAM
[0082] 008A          VGWITE EQU  >8A               MOVE DATA FROM VDP TO ERAM
[0083] 008B          GVWITE EQU  >8B               WRITE DATA FROM GRAM TO VRAM
[0084] 008E          GDTECT EQU  >8E               ERAM DETECT&ROM PAGE 1 ENABLE
[0085] 008F          SCNSMT EQU  >8F               SCAN STATEMENT FOR PRESCAN
[0086]               ***********************************************************

COMPCT, SYM, SMB, SCHSYM and some others are all hard coded. (Sorry this is your problem.)

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Well, I was adding a feature to my xas99 cross-assembler to embed the generated code in an Extended BASIC program. (There are, of course, quite a few tools which do that already.) When compiling the code myself I can relocate it so that it fits the upper end of the XB token table, and everything works fine.

 

But for arbitrary, existing images I cannot coax the XB loader into placing the tokens where I want them. And fudged header data is noticed by the loader and results in an I/O Error. If it were an actually useful feature I'd add some code to move the image from the token table to the final destination, but it's been more of a plaything anyway ...

I don't know what you mean by the "XB token table" or "arbitrary, existing images" - can you clarify these terms?

 

Anyway, let's start at the beginning. If I understand you correctly you are trying to get the cross assembler to embed an assembly language program into an XB program, presumably so you can easily load and run it via XB. As you noted there are several loaders that can do this but as far as I know they all require that you go to the TI and create the program using XB and then save it from XB. One example is HMLOADER which is part of The Missing Link package. This lets you embed up to 24K of assembly in an XB program. But it sounds like you want to create and save the XB program directly from the assembler, bypassing the need to load the assembly code with the s..l..o..w.. CALL LOAD assembly loader in XB. If you use relocatable code (no AORGs) and assuming xas99 can compute the addresses of the labels the same way CALL LOAD would, then this should not be too difficult. To create the file you'd have to figure a starting address for the A/L code so that it ends at >FFE7 and then add a 1 line XB program ahead of that to start up the code, then save the file to disk.

 

Let me know if I understand you correctly and we can go from there - no point in taking a lot of time answering the wrong question.

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If I understand you correctly you are trying to get the cross assembler to embed an assembly language program into an XB program, presumably so you can easily load and run it via XB.

 

Let me know if I understand you correctly and we can go from there - no point in taking a lot of time answering the wrong question.

 

Yes, you're spot on, that's exactly what I'm doing. But I already integrated it into the xas99 assembler, pretty much in the way you outlined in your post, so there aren't really any open questions left. ;)

 

I was merely musing how convenient it would have been if the XB loader could have been made to place the code at arbitrary positions, because then you could have embedded AORG'ed code or precompiled code ("arbitrary, existing images") as well. Of course you can still do that if you embed an additional routine that will move the embedded code to its real position before executing it, but I haven't bothered to implement that.

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Look like I get to take the weekend off! Glad that you could work it out. For what it's worth, I think the XB loader would work if you saved the entire high memory, but I don't think you could quite get to >A000 and you'd have to save all the way to >FFE7. Not very efficient if you only want to save 1k starting at >B000.

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Never mind ... I guess I found it. Some sleep seems to be a good way to solve problems ... when I lay in bed this morning I thought "oh no, that's a FILE, not a PROGRAM, so ..."

 

0A = length of record

First record: ABCD, startLNT, endLNT, Checksum, Memtop (10 bytes)

FF = last record in this sector; all following bytes are ignored (never read)

 

Actually I was also thrown off track with INT/VAR (and INT/FIX), because my Extended BASIC sample programs

 

100 A$="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
110 OPEN #1:"DSK1.INTVAR63",OUTPUT,INTERNAL,FIXED 63
120 PRINT #1:SEG$(A$,1,20)
...
yielded
tiger ~/xdt99 > xdm99.py w.dsk -S 0x2a
00:  14 41 42 43  44 45 46 47  48 49 4A 4B  4C 4D 4E 4F   .ABC DEFG HIJK LMNO 
10:  50 51 52 53  54 00 00 00  00 00 00 00  00 00 00 00   PQRS T... .... .... 
20:  00 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00   .... .... .... .... 
on disk. I was assuming that the first data byte indicates how long the record is, so for INT/VAR this would be
00:  15 14 41 42  43 44 45 46  47 48 49 4A  4B 4C 4D 4E   ..AB CDEF GHIJ KLMN 
10:  4F 50 51 52  53 54 0B 0A  42 43 44 45  46 47 48 49   OPQR ST.. BCDE FGHI 
20:  4A 4B 15 14  43 44 45 46  47 48 49 4A  4B 4C 4D 4E   JK.. CDEF GHIJ KLMN 
But obviously this must be an artifact of writing Extended BASIC strings in INT mode, not a general feature of INT records. Otherwise the start of long BASIC programs
000000: 0a ab cd c5 38 ca 2b f0 ed ff e7 ...
wouldn't make sense ...
I should probably read more documentation rather than try to reverse-engineer stuff ... :-D
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Actually I was also thrown off track with INT/VAR (and INT/FIX), because my Extended BASIC sample programs

 

100 A$="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
110 OPEN #1:"DSK1.INTVAR63",OUTPUT,INTERNAL,FIXED 63
120 PRINT #1:SEG$(A$,1,20)
...
yielded
tiger ~/xdt99 > xdm99.py w.dsk -S 0x2a
00:  14 41 42 43  44 45 46 47  48 49 4A 4B  4C 4D 4E 4F   .ABC DEFG HIJK LMNO 
10:  50 51 52 53  54 00 00 00  00 00 00 00  00 00 00 00   PQRS T... .... .... 
20:  00 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00   .... .... .... .... 
on disk. I was assuming that the first data byte indicates how long the record is, so for INT/VAR this would be
00:  15 14 41 42  43 44 45 46  47 48 49 4A  4B 4C 4D 4E   ..AB CDEF GHIJ KLMN 
10:  4F 50 51 52  53 54 0B 0A  42 43 44 45  46 47 48 49   OPQR ST.. BCDE FGHI 
20:  4A 4B 15 14  43 44 45 46  47 48 49 4A  4B 4C 4D 4E   JK.. CDEF GHIJ KLMN 
But obviously this must be an artifact of writing Extended BASIC strings in INT mode, not a general feature of INT records. Otherwise the start of long BASIC programs
000000: 0a ab cd c5 38 ca 2b f0 ed ff e7 ...
wouldn't make sense ...
I should probably read more documentation rather than try to reverse-engineer stuff ... :-D

 

If you could read GPL code RXB has the XB source code included. Any changes are noted with

 

* RXB PATCH CODE then some note here on what it is ********

 

The Regular XB code is there but indented with * as the GPL Assembler ignores anything after * in Source Code INT/VAR 254 is in RXB TEXT lrxb4 (>8000->9FFF) in GROM

 

This is the SAVE, SAVE INT/VAR 254 and MERGE souce code:

***********************************************************
[2175]               *                    SAVE STATEMENT
[2176]               * SAVE "NAME", MERGE : Save in crunched form in program
[2177]               *  into a file one line at at time with the line number.
[2178]               *  File opened with sequential accessed, variable-length
[2179]               *  records (161 max), display type & output mode, move one
[2180]               *  line number and one in text to the crunch buffer then
[2181]               *  write to the file one line at a time.
[2182]               * A normal SAVE : When ERAM not exist or the size of the
[2183]               *  program and line number table in ERAM can fit in VDP
[2184]               *  (can be moved into VDP from ERAM once), then the save
[2185]               *  statement saves a program image to an external device,
[2186]               *  including all the information the system needs for
[2187]               *  rebuilding the program image on a machine with a
[2188]               *  different memory size, also included is a checksum for
[2189]               *  rudimentary error checking and for PROTECTION VIOLATION
[2190]               * A sequential SAVE : Maximum-length records are performed
[2191]               *  to write the file and each record is copied into the VDP
[2192]               *  from ERAM before it is written.
[2193]               ***********************************************************
[2194] 8DB8 DA,45,80 SAVE   CLOG >80,@FLAG         * PROTECTION VIOLATION
[2195] 8DBB 57,DB           BR   ERRPV
[2196] 8DBD 06,92,35        CALL GPNAME            This will also close all file
[2197]               * Check SAVE "NAME", MERGE or SAVE "NAME", PROTECTED first
[2198] 8DC0 86,A3,B9        CLR  V@SAPROT          Clear "PROTECTED" flag
[2199] 8DC3 0F,79           XML  PGMCHR
[2200] 8DC5 8E,42           CZ   @CHAT             EOL?
[2201] 8DC7 6E,2B           BS   SAZ1              Yes, no need to check any opt
[2202] 8DC9 D6,42,B3        CEQ  COMMAZ,@CHAT      Has to be a comma here
[2203] 8DCC 41,09           BR   ERRSYN
[2204] 8DCE D7,B0,2C        DCEQ >C805,V*PGMPTR    Unquoted string with length 5
       8DD1 C8,05
[2205]               *                              has to be MERGE at this time
[2206] 8DD3 4D,F4           BR   G8DF4
[2207] 8DD5 D7,E0,02        DCEQ >4D45,V@2(@PGMPTR) "ME" of MErge
       8DD8 2C,4D,45
[2208]               * RXB PATCH CODE OPTION ADDED IV254 FOR SAVE 2015 *********
[2209]               * SAVE "DSK#.FILENAME",MERGE ! SAVE MERGE FORMAT
[2210]               * SAVE "DSK#.FILENAME",IV254 ! SAVE IV254 PROGRAM FORMAT
[2211]               * SAVE "DSK#.FILENAME" ! NORMAL PROGRAM FORMAT OR IV254
[2212]               *       BR   ERRSYN             If not : SYNTAX ERROR
[2213] 8DDB 5F,7C           BR    CIV254            CHECK FOR IV254 OPTION
[2214] 8DDD D7,E0,04        DCEQ >5247,V@4(@PGMPTR) "RG" of meRGe
       8DE0 2C,52,47
[2215] 8DE3 41,09           BR   ERRSYN             If not : SYNTAX ERROR
[2216] 8DE5 D6,E0,06        CEQ  >45,V@6(@PGMPTR)   "E" of mergE

99/4 GPL-ASSEMBLER (Pass 3) correct                                   PAGE 0039 
FLMGR-359
       8DE8 2C,45
[2217] 8DEA 41,09           BR   ERRSYN             If not : SYNTAX ERROR
[2218] 8DEC 8E,E0,07        CZ   V@7(@PGMPTR)      Check for EOL
       8DEF 2C
[2219] 8DF0 41,09           BR   ERRSYN            Not EOL : SYNTAX ERROR
[2220] 8DF2 4F,76           BR   SAVMG             Go to handle this option
[2221]               * Has to be PROTECTED option here, crunched as unquoted str
[2222] 8DF4 D7,B0,2C G8DF4  DCEQ >C809,V*PGMPTR    Unquoted string with length 9
       8DF7 C8,09
[2223]               *                              has to be PROTECTED
[2224] 8DF9 41,09           BR   ERRSYN
[2225] 8DFB D7,E0,02        DCEQ >5052,V@2(@PGMPTR) "PR" of PRotected
       8DFE 2C,50,52
[2226] 8E01 41,09           BR   ERRSYN             If not : SYNTAX ERROR
[2227] 8E03 D7,E0,04        DCEQ >4F54,V@4(@PGMPTR) "OT" of prOTected
       8E06 2C,4F,54
[2228] 8E09 41,09           BR   ERRSYN             If not : SYNTAX ERROR
[2229] 8E0B D7,E0,06        DCEQ >4543,V@6(@PGMPTR) "EC" of protECted
       8E0E 2C,45,43
[2230] 8E11 41,09           BR   ERRSYN             If not : SYNTAX ERROR
[2231] 8E13 D7,E0,08        DCEQ >5445,V@8(@PGMPTR) "TE",of protecTEd
       8E16 2C,54,45
[2232] 8E19 41,09           BR   ERRSYN             If not : SYNTAX ERROR
[2233] 8E1B D6,E0,0A        CEQ  >44,V@10(@PGMPTR)  "D" of protecteD
       8E1E 2C,44
[2234] 8E20 41,09           BR   ERRSYN             If not : SYNTAX ERROR
[2235] 8E22 8E,E0,0B        CZ   V@11(@PGMPTR)     Check EOL
       8E25 2C
[2236] 8E26 41,09           BR   ERRSYN
[2237] 8E28 90,A3,B9        INC  V@SAPROT
[2238]               ***********************************************************
[2239] 8E2B 8E,80,84 SAZ1   CZ   @RAMTOP           If ERAM NOT present then
[2240] 8E2E 4E,42           BR   G8E42
[2241]               ***** CLEAR THE BREAKPOINT IN VDP ALONE TO SPEED UP *******
[2242] 8E30 BD,52,30        DST  @STLN,@FAC8       End of line # buffer
[2243] 8E33 B2,B0,52 G8E33  AND  >7F,V*FAC8        Clear the breakpoint
       8E36 7F
[2244] 8E37 A3,52,00        DADD 4,@FAC8           Move to the next one
       8E3A 04
[2245] 8E3B C5,52,32        DCH  @ENLN,@FAC8       Until done
[2246] 8E3E 4E,33           BR   G8E33
[2247] 8E40 4E,69           BR   VSAVZ
[2248] 8E42 06,A0,20 G8E42  CALL UBSUB             Clear the breakpoint in ERAM
[2249] 8E45 BD,02,80        DST  @RAMTOP,@MNUM     Top of memory in ERAM
       8E48 84
[2250] 8E49 A5,02,30        DSUB @STLN,@MNUM
[2251] 8E4C 91,02           DINC @MNUM             # of bytes total in ERAM
[2252] 8E4E BD,00,70        DST  @HIVDP,@VAR0      Top of memory in VDP
[2253] 8E51 A5,00,02        DSUB @MNUM,@VAR0
[2254] 8E54 91,00           DINC @VAR0
[2255]               * Check is there enough memory in VDP to move the program
[2256]               *  text and line number table from ERAM to VDP
[2257] 8E56 0A              GT                  Not enough memory in VDP for sur
[2258] 8E57 4E,B7           BR   GSAVE
[2259] 8E59 BF,10,0A        DST  VRAMVS+64+256,@VAR5 * 64 bytes are for safety b
       8E5C 98
[2260]                
[2261]               * DSR routine give file error when loading a program which
[2262]               *  VDP maximum size and was saved from VDP to be a program
[2263]               *  on disk when ERAM not exist. In order to fix this proble
[2264]               *  restrict the program memory to be 256 bytes less then th
[2265]               *  real space in VDP when ERAM not exist.
[2266] 8E5D C9,00,10        DCHE @VAR5,@VAR0       Not enough memory in VDP, do
[2267]               *                              sequential file save

99/4 GPL-ASSEMBLER (Pass 3) correct                                   PAGE 0040 
FLMGR-359
[2268] 8E60 4E,B7           BR   GSAVE
[2269] 8E62 A7,10,00        DSUB 10,@VAR5        * 10 bytes for control informat
       8E65 0A
[2270] 8E66 06,8F,4A        CALL GVMOV             Enough memory in VDP, move it
[2271]               *                             over and do the normal save l
[2272]               **************** Without ERAM, or after GVMOV *************
[2273]               **************** do the normal save           *************
[2274] 8E69 BD,0A,40 VSAVZ  DST  @FREPTR,@STADDR   Store additional control info
[2275] 8E6C 93,0A           DDEC @STADDR           Back up some more for 2 byte
[2276] 8E6E BD,B0,0A        DST  @>8370,V*STADDR   First current top of memory
       8E71 70
[2277] 8E72 97,0A           DDECT @STADDR
[2278] 8E74 BD,B0,0A        DST  @STLN,V*STADDR    Then STLN
       8E77 30
[2279] 8E78 97,0A           DDECT @STADDR
[2280] 8E7A BD,B0,0A        DST  @ENLN,V*STADDR    Then ENLN
       8E7D 32
[2281] 8E7E 97,0A           DDECT @STADDR          Then
[2282] 8E80 BD,B0,0A        DST  @STLN,V*STADDR
       8E83 30
[2283] 8E84 B9,B0,0A        DXOR @ENLN,V*STADDR    STLN XORed with ENLN
       8E87 32
[2284] 8E88 D6,A3,B9        CEQ  1,V@SAPROT        Check is there PROTECTED opti
       8E8B 01
[2285] 8E8C 4E,91           BR   G8E91
[2286] 8E8E 83,B0,0A        DNEG V*STADDR          Negate the CHECKSUM to indica
[2287]               *                             LIST/EDIT protection
[2288] 8E91 BD,E0,06 G8E91  DST  @STADDR,V@BUF(@PABPTR)  Save start address in P
       8E94 04,0A
[2289] 8E96 93,0A           DDEC @STADDR
[2290] 8E98 BD,E0,0A        DST  @>8370,V@RNM(@PABPTR)   Compute # of bytes used
       8E9B 04,70
[2291] 8E9D A5,E0,0A        DSUB @STADDR,V@RNM(@PABPTR)   and store that in PAB
       8EA0 04,0A
[2292] 8EA2 8E,80,84        CZ   @RAMTOP           If ERAM exists then
[2293] 8EA5 6E,AD           BS   G8EAD
[2294] 8EA7 BD,30,0C        DST  @BBB1,@STLN       Restore the original STLN, EN
[2295] 8EAA BD,32,08        DST  @CCC1,@ENLN        which points to ERAM
[2296] 8EAD 06,97,5E G8EAD  CALL IOCALL            Call Device Service Routine f
[2297] 8EB0 06              BYTE CZSAVE          * SAVE operation
[2298] 8EB1 06,60,22 LRTOPL CALL KILSYM            Release string space/symbol t
[2299] 8EB4 05,60,12        B    TOPL15            Go back to toplevel
[2300]               ***********************************************************
[2301]               * Open the sequential file, set the PAB
[2302]               * File type             : sequential file
[2303]               * Mode of operation     : output
[2304]               * Data type             : internal
[2305]               * Record type           : variable length records
[2306]               * Logical record length : 254 maximum
[2307] 8EB7 31,00,09 GSAVE  MOVE 9,G@PAB3,V@4(@PABPTR) Build the PAB
       8EBA E0,04,04
       8EBD 8D,24
[2308] 8EBF 96,E0,05        DECT V@FLG(@PABPTR)    Put in the correct I/O mode :
       8EC2 04
[2309]               * Compute the data buffer address
[2310] 8EC3 BD,4A,70        DST  @>8370,@FAC
[2311] 8EC6 A7,4A,00        DSUB 253,@FAC
       8EC9 FD
[2312] 8ECA BD,E0,06        DST  @FAC,V@BUF(@PABPTR)
       8ECD 04,4A
[2313] 8ECF BD,58,4A        DST  @FAC,@EEE1     Save it for later use in GVWITE
[2314] 8ED2 06,97,6B        CALL CDSR           Call device service routine to o
[2315] 8ED5 57,94           BR   ERRZ2B         Return with ERROR indication in
[2316]               *                          Put 8 bytes control info at the

99/4 GPL-ASSEMBLER (Pass 3) correct                                   PAGE 0041 
FLMGR-359
[2317]               *                          beginning of the data buffer
[2318] 8ED7 BF,B0,4A        DST  >ABCD,V*FAC       >ABCD indentifies a program f
       8EDA AB,CD
[2319] 8EDC 95,4A           DINCT @FAC              when doing LOAD later
[2320] 8EDE BD,B0,4A        DST  @STLN,V*FAC       Save STLN in control info
       8EE1 30
[2321] 8EE2 95,4A           DINCT @FAC
[2322] 8EE4 BD,B0,4A        DST  @ENLN,V*FAC       ENLN too
       8EE7 32
[2323] 8EE8 95,4A           DINCT @FAC
[2324] 8EEA BD,B0,4A        DST  @STLN,V*FAC
       8EED 30
[2325] 8EEE B9,B0,4A        DXOR @ENLN,V*FAC       Save the checksum
       8EF1 32
[2326] 8EF2 D6,A3,B9        CEQ  1,V@SAPROT        Check is there PROTECTED opti
       8EF5 01
[2327] 8EF6 4E,FB           BR   G8EFB
[2328] 8EF8 83,B0,4A        DNEG V*FAC             Negate the CHECKSUM to indica
[2329]               *                              the LIST/EDIT protection
[2330] 8EFB 95,4A    G8EFB  DINCT @FAC
[2331] 8EFD BD,B0,4A        DST  @RAMTOP,V*FAC     Save the top of memory info
       8F00 80,84
[2332] 8F02 BE,E0,09        ST   10,V@CNT(@PABPTR) Set the caracter count in PAB
       8F05 04,0A
[2333] 8F07 06,97,5E        CALL IOCALL            Call device service routine
[2334] 8F0A 03              BYTE CZWRIT          * With I/O opcode : write, to s
[2335]               *                       the control info for the first reco
[2336]               * Now start to use maximum-length record to write the file
[2337]               * and each record is copied into the VDP from ERAM bofore i
[2338]               * is written
[2339] 8F0B BD,54,30        DST  @STLN,@DDD1       Starting address on ERAM
[2340]               *      DST  @>8370,@EEE1      @EEE1 has been set up before
[2341]               *      DST  253,@EEE1         Starting address of the data
[2342]               *                              buffer on VDP
[2343] 8F0E BD,08,80        DST  @RAMTOP,@CCC1
       8F11 84
[2344] 8F12 A5,08,30        DSUB @STLN,@CCC1
[2345] 8F15 91,08           DINC @CCC1
[2346] 8F17 BE,E0,09        ST   254,V@CNT(@PABPTR) Set the character count of P
       8F1A 04,FE
[2347] 8F1C BF,56,00 G8F1C  DST  254,@FFF1         @FFF1 byte count
       8F1F FE
[2348] 8F20 0F,8B           XML  GVWITE            Move data from ERAM to VDP
[2349] 8F22 06,97,5E        CALL IOCALL            Call device service routine
[2350] 8F25 03              BYTE CZWRIT
[2351] 8F26 A3,54,00        DADD 254,@DDD1         Update the source addr on ERA
       8F29 FE
[2352] 8F2A A7,08,00        DSUB 254,@CCC1         # of bytes left to move
       8F2D FE
[2353] 8F2E 6F,44           BS   GSAV1             No more bytes to save
[2354] 8F30 CB,08,00        DCHE 254,@CCC1         Leave the last record alone
       8F33 FE
[2355] 8F34 6F,1C           BS   G8F1C
[2356]               * Move the last @CCC1 bytes from ERAM to VDP
[2357] 8F36 BD,56,08        DST  @CCC1,@FFF1       @FFF1 : Byte count
[2358] 8F39 0F,8B           XML  GVWITE            Write data from ERAM to VDP
[2359] 8F3B BC,E0,09        ST   @CCC1+1,V@CNT(@PABPTR) Update the character cou
       8F3E 04,09
[2360]               *                                   in PAB
[2361] 8F40 06,97,5E        CALL IOCALL            Call device service routine
[2362] 8F43 03              BYTE CZWRIT
[2363] 8F44 06,97,5E GSAV1  CALL IOCALL
[2364] 8F47 01              BYTE CZCLOS          * Close the file
[2365] 8F48 4E,B1           BR   LRTOPL            Continue

99/4 GPL-ASSEMBLER (Pass 3) correct                                   PAGE 0042 
FLMGR-359
[2366]               ***********************************************************
[2367]               * Move the program text & line # table to VDP, and relocate
[2368] 8F4A BD,0C,30 GVMOV  DST  @STLN,@BBB1       Save STLN, ENLN for later use
[2369] 8F4D BD,08,32        DST  @ENLN,@CCC1
[2370] 8F50 BD,54,30        DST  @STLN,@DDD1       Source addr on ERAM
[2371] 8F53 BD,58,10        DST  @VAR5,@EEE1       Destination addr on VDP
[2372] 8F56 BD,0A,58        DST  @EEE1,@STADDR     Use later for RELOCA
[2373] 8F59 BD,56,80        DST  @RAMTOP,@FFF1
       8F5C 84
[2374] 8F5D A5,56,30        DSUB @STLN,@FFF1       # of bytes to move
[2375] 8F60 91,56           DINC @FFF1             @FFF1 : byte count for GVWITE
[2376] 8F62 0F,8B           XML  GVWITE            Move from ERAM to VDP
[2377] 8F64 BD,A3,BC        DST  @RAMTOP,V@OLDTOP  Set up @RAMTOP for old top
       8F67 80,84
[2378]               *                             of memory
[2379] 8F69 BD,A3,BE        DST  @>8370,V@NEWTOP   Set up @>8370 for new top
       8F6C 70
[2380]               *                             of memory
[2381] 8F6D 06,8D,36        CALL RELOCA            Relocate the program
[2382] 8F70 BD,40,30        DST  @STLN,@FREPTR     Set up @FREPTR
[2383] 8F73 93,40           DDEC @FREPTR
[2384] 8F75 00              RTN
[2385]               ***********************************************************
[2386]               * Save the crunched form of a program into a file.
[2387]               * Move the line number and text to the crunch buffer, then
[2388]               * write to the file one line at a time.
[2389]               ***********************************************************
[2390]               * Open the file with:
[2391]               *  I/O opcode            : OPEN
[2392]               *  File type             : SEQUENTIAL file
[2393]               *  Mode of operation     : OUTPUT
[2394]               *  Data type             : DISPLAY type data
[2395]               *  Record type           : VARIABLE LENGTH records
[2396]               *  Data buffer address   : Crunch buffer address
[2397]               *  Logical record length : 163 (length of curnch buffer + 2
[2398]               *                                bytes for line #) maximum
[2399] 8F76 31,00,09 SAVMG  MOVE 9,G@PAB1,V@4(@PABPTR) Build PAB
       8F79 E0,04,04
       8F7C 8F,F9
[2400] 8F7E 06,97,65        CALL IOCLZ1         Call the DSR routine to open fil
[2401] 8F81 BD,50,32        DST  @ENLN,@FAC6    Start from the first line #
[2402] 8F84 A7,50,00        DSUB 3,@FAC6        @FAC6 now points to the 1st line
       8F87 03
[2403]               *                          Write to the file from crunch bu
[2404]               *                           one line at a time
[2405] 8F88 86,00    G8F88  CLR  @VAR0             Make it a two byte later
[2406] 8F8A 8E,80,84        CZ   @RAMTOP           If ERAM exists then
[2407] 8F8D 6F,B6           BS   G8FB6
[2408] 8F8F BD,54,50        DST  @FAC6,@DDD1       Write the 4 bytes (line # and
[2409]               *                              line pointer) from ERAM to
[2410]               *                              crunch buffer
[2411]               *                             @DDD1 : Source address on ERA
[2412] 8F92 BF,58,08        DST  CRNBUF,@EEE1      @EEE1 : Destination address
       8F95 20
[2413]               *                                      on VDP
[2414] 8F96 BF,56,00        DST  4,@FFF1           @FFF1 : byte count
       8F99 04
[2415] 8F9A 0F,8B           XML  GVWITE            Write data from ERAM to VDP
[2416] 8F9C BD,54,A8        DST  V@CRNBUF+2,@DDD1  Line pointer now points to
       8F9F 22
[2417]               *                              length byte
[2418] 8FA0 93,54           DDEC @DDD1             Get the length of this line
[2419]               *                             @DDD1 : Source address on ERA
[2420] 8FA2 91,56           DINC @FFF1             @FFF1 : Byte count, coming ba

99/4 GPL-ASSEMBLER (Pass 3) correct                                   PAGE 0043 
FLMGR-359
[2421]               *                                     from GVWITE above, =0
[2422] 8FA4 0F,8C           XML  GREAD1            Read the length byte from ERA
[2423] 8FA6 BC,01,58        ST   @EEE1,@VAR0+1     @EEE1 : Destination addr on C
[2424] 8FA9 BF,58,08        DST  CRNBUF+2,@EEE1    Write the text from ERAM to 3
       8FAC 22
[2425]               *                             byte of crunch buffer
[2426]               *                             @EEE1 : Destination addr on V
[2427]               *                             @DDD1 : Source addr on ERAM
[2428] 8FAD 91,54           DINC @DDD1             Back to point to the text
[2429] 8FAF BD,56,00        DST  @VAR0,@FFF1       @FFF1 : Byte count
[2430] 8FB2 0F,8B           XML  GVWITE            Write data from ERAM to VDP
[2431] 8FB4 4F,CD           BR   G8FCD             ERAM not exist : line # table
[2432]               *                              and text in VDP
[2433] 8FB6 BD,A8,20 G8FB6  DST  V*FAC6,V@CRNBUF   PUT THE LINE # IN
       8FB9 B0,50
[2434] 8FBB BD,4C,E0        DST  V@2(@FAC6),@FAC2  Get the line pointer out
       8FBE 02,50
[2435] 8FC0 93,4C           DDEC @FAC2             Line pointer now points to th
[2436]               *                              length byte
[2437] 8FC2 BC,01,B0        ST   V*FAC2,@VAR0+1    Get the length out
       8FC5 4C
[2438]               * Move the text into the crunch buffer
[2439] 8FC6 34,00,A8        MOVE @VAR0,V@1(@FAC2),V@CRNBUF+2
       8FC9 22,E0,01
       8FCC 4C
[2440] 8FCD B2,A8,20 G8FCD  AND  >7F,V@CRNBUF      Reset possible breakpoint
       8FD0 7F
[2441] 8FD1 95,00           DINCT @VAR0    * Total length=text length+line # len
[2442] 8FD3 BC,E0,09        ST   @VAR0+1,V@CNT(@PABPTR) Store in the cahracter c
       8FD6 04,01
[2443] 8FD8 06,97,5E        CALL IOCALL            Call the device service routi
[2444] 8FDB 03              BYTE CZWRIT          * Write
[2445] 8FDC A7,50,00        DSUB 4,@FAC6           Go to the next line #
       8FDF 04
[2446] 8FE0 C9,50,30        DCHE @STLN,@FAC6       Finish moving all
[2447] 8FE3 6F,88           BS   G8F88
[2448] 8FE5 BF,A8,20        DST  >FFFF,V@CRNBUF    Set up a EOF for the last rec
       8FE8 FF,FF
[2449] 8FEA BE,E0,09        ST   2,V@CNT(@PABPTR)  Only write this 2 bytes
       8FED 04,02
[2450] 8FEF 06,97,5E        CALL IOCALL            Call the device service routi
[2451] 8FF2 03              BYTE CZWRIT          * Write
[2452] 8FF3 06,97,5E        CALL IOCALL            Call the device service routi
[2453] 8FF6 01              BYTE CZCLOS          * Close the file
[2454] 8FF7 4E,B1           BR   LRTOPL            Go back to top level
[2455] 8FF9 00,12,08 PAB1   BYTE >00,>12,>08,>20,>A3,>00,>00,>00,>60
       8FFC 20,A3,00
       8FFF 00,00,60
[2456]               *           >0820 = CRNBUF
[2457]               *           >A3   = 163
[2458]               *           >60   = OFFSET
[2459]               ***********************************************************
[2460]               *                   MERGE ROUTINE
[2461]               * MERGE load a file which is in crunched program form into
[2462]               * the CRNBUF one record (one in) at a time then take the
[2463]               * line # out in FAC, text length into @CHAT, and edit it
[2464]               * into the program. Identify EOF by the last record which
[2465]               * is set up at SAVE time.
[2466]               ***********************************************************
[2467] 9002 06,92,35 MERGE  CALL GPNAME            Close all file, set up PAB
[2468] 9005 DA,45,80        CLOG >80,@FLAG         Check PROTECTION VIOLATION
[2469] 9008 57,DB           BR   ERRPV
[2470]               * To fix the bug #06 in MERGE
[2471] 900A 0F,79           XML  PGMCHR            Check EOL

99/4 GPL-ASSEMBLER (Pass 3) correct                                   PAGE 0044 
FLMGR-359
[2472] 900C 8E,42           CZ   @CHAT
[2473] 900E 41,09           BR   ERRSYN            Not EOL : SYNTAX ERROR
[2474]               * Open the file with
[2475]               *  I/O opcode            : OPEN
[2476]               *  File type             : SEQUENTIAL file
[2477]               *  Mode of operation     : INPUT
[2478]               *  Data type             : DISPLAY type data
[2479]               *  Record type           : VARIABLE LENGTH records
[2480]               *  Data buffer address   : crunch address
[2481]               *  Logical record length : 163 maximum
[2482] 9010 31,00,09        MOVE 9,G@PAB1,V@4(@PABPTR)  Set up PAB
       9013 E0,04,04
       9016 8F,F9
[2483] 9018 94,E0,05        INCT V@FLG(@PABPTR)    Put in correct I/O mode : >14
       901B 04
[2484] 901C 06,97,65        CALL IOCLZ1            Call the device service routi
[2485]               *                              to open the file
[2486] 901F 06,97,5E        CALL IOCALL            Call the device service routi
[2487] 9022 02              BYTE CZREAD          *  to read
[2488] 9023 D7,A8,20        DCEQ >FFFF,V@CRNBUF    If 1st rec is EOF
       9026 FF,FF
[2489] 9028 77,94           BS   ERRZ2B
[2490] 902A 87,80,D6 G902A  DCLR @>83D6            Read in one line and edit it
[2491]               *                              program
[2492] 902D BC,42,E0        ST   V@CNT(@PABPTR),@CHAT Length of this record
       9030 09,04
[2493] 9032 96,42           DECT @CHAT             Text length = total length-2
[2494]               *                                          (line # length)
[2495]               *                              Put it in @CHAT for EDITLN
[2496] 9034 BD,4A,A8        DST  V@CRNBUF,@FAC     Put the line # in @FAC for ED
       9037 20
[2497] 9038 86,56           CLR  @FAC12            Make it a double byte
[2498] 903A BC,57,42        ST   @CHAT,@FAC13
[2499]               * Move the text up 2 bytes
[2500] 903D 34,56,A8        MOVE @FAC12,V@CRNBUF+2,V@CRNBUF
       9040 20,A8,22
[2501] 9043 BD,A3,9E        DST  @PABPTR,V@MRGPAB  SAVE PAB POINTER
       9046 04
[2502] 9047 06,60,32        CALL EDITLN            EDIT IT TO THE PROGRAM
[2503] 904A 87,04           DCLR @PABPTR           Clear temporary PAB pointer
[2504] 904C C1,04,A3        DEX  V@MRGPAB,@PABPTR  Restore old PAB pointer
       904F 9E
[2505] 9050 06,97,5E        CALL IOCALL            CALL THE DEVICE SERVICE ROUTI
[2506] 9053 02              BYTE CZREAD          *  read another record or anoth
[2507]               *                              line
[2508] 9054 D7,A8,20        DCEQ >FFFF,V@CRNBUF    End of EOF
       9057 FF,FF
[2509] 9059 50,2A           BR   G902A
[2510]               * Double check EOF record
[2511] 905B D6,E0,09 MERGZ1 CEQ  2,V@CNT(@PABPTR)  I/O ERROR
       905E 04,02
[2512] 9060 57,94           BR   ERRZ2B
[2513] 9062 06,97,5E        CALL IOCALL            Call the device service routi
[2514] 9065 01              BYTE CZCLOS          *  close the file
[2515] 9066 4E,B1           BR   LRTOPL            Go back to top level
[2516]               ***********************************************************
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  • 6 months later...

Okay, thanks for this info. I read that already anywhere, that only large programs are stored in the large format. But I don't know how large large is.

I'll try your trick. I thought there is an other (undocumented) more easy way to force saving a program to that file type.

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XB256 has a utility that forces a save in IV254 format. This is part of the Game Developer's Package that can be downloaded from the Development Resources at the top of the page.

You would load and run XB256, then load the XB program. Then:

CALL LINK(“SAVEIV”,”DSKn.FILENAME”)
This will save an XB program in IV254 format. See page 26 for more information.

Also, I think Rich Gilbertson did some work including this with RXB and it may be part of that package.

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