Atari 800 with Encore Video Productions Info Display System

[Atari 800 with Encore Video Productions Info Display System]

The 1st sector link appears ok. the 2nd sector link is mangled. from then on, it is very difficult to tell the sector link from code as the sector link appears to be a copy of the next 3 bytes in the file Ie the sector link wasn't put in. (looking at the raw data in the atr file with a hex editor). it would appear the this dos cannot write out roms properly.

 

James

[Atari 800 with Encore Video Productions Info Display System]

Have just had a very quick look. The fact it replaces the 3rd ram slot makes this look like a 16K cart starting at $8000. Maybe try superdos for the binary save next time.

 

here is the last 6 bytes 80 00 04 F8 BF 08 init address of $BFF8, run address of $8000

 

James

[Interview questions for Bill Wilkinson?]

I too would like the specs of dos XE and how to get it working with 16meg drive size. I dissembled it and gave it a go but failed.

 

James

[ITalk II voice synthesizer for Atari 400/800]

No doubt - if they were already using SIO, why the heck would they use joystick cables for data?

Likely to save a chip or 2 to cut down on costs and for better direct control of the chip and easier to program from basic etc.

 

James

[Ultimate 1MB, OS-B and BASIC]

D'oh! Looks like the pigwa.net domain just expired. That's what I get for leaving things until morning.

 

hmmmm. just tried and it works.... no idea what happened.

 

James

[Ultimate 1MB, OS-B and BASIC]

download the HTT version from here

 

http://ftp.pigwa.net/stuff/collections/nir_dary_cds/ROMS/ROMS_OS/REPLACEM/SUPERMON/

 

you may need to remove the 6 header bytes. It is supermon. RevB and patched for cart and 2 joystick ports.

 

James

[Searching for Super Archiver ROM dumps]

I know i used to have an image of the rom and dissembled it as well to have a look. Think i can find any of it now

 

James

[Atari Indus GT disk drive - equivalent to a 'Happy' drive? Better?]

If the indus has the 64K ram, There shouldn't be any reason for it not to emulate a happy or an archiver. someone just needs to write the software to upload to the drive

 

James

[Atari 1400XL, 1060 CP/M and 1450XLD updates]

Mega bump.....

A schematic of the 1060 would be nice to see.

 

James

[CA2001 G5 Error indication]

Back in early 2010, AA member tregare did a scan of the (his own copy I suppose) Indus GT Field manual, and is located here -

 

http://atariage.com/forums/topic/131602-indusgt-field-service-manual/page-2

 

Good luck

Actually, it was mine. I scanned the schematics years ago from the service manual and released them on to a BBS Now look where they are. The manual came much latter.

 

James

[CA2001 G5 Error indication]

Yes, but it is only sets the default density at turn on.

 

James

[Flight Simulator II Scenery Disks & subLogic Binder]

bump.

 

Is there anyplace to get any scenery disks along with the maps that come with them?

 

James

[What was the 1050 Kiwi chip for 1050?]

Now for some questions:

 

It would be interesting to have some other ROM dumps so we can check if Guus' dump is correct.

 

Was there any supporting software available, like a diagnostic tool or some archiver/backup software?

 

Does this upgrade provide any custom SIO commands, like for example the possibility to upload code to the SRAM?

 

so long & thanks in advance for any further info,

 

Hias

1) it is correct

2) Supermax required Superdos for best use. Back in the day, getting anything from over seas cost $$$$ this was a much cheaper local product.

3) Only extra commands are ' g = reset fdc: h= return ack only,: i is superdos skew format command single or double only.

I personally added the USD compatiable format command and one to read 256 bytes from anywhere in memory.

 

James

[1050 Drive Diagnosis]

Be careful with the 2793 or 2797. if using a 2797, i think one leg needs to hang out of the socket. Cannot remember which one tho.

 

James

[Socket vs. Precision Socket?]

I thought most XL's have single wipe sockets. They are a piece of c$#p. Many times they cause grief when doing upgrades or fault finding.

 

James

[What was the 1050 Kiwi chip for 1050?]

It is a 74HC42.

 

See, my memory sometimes works........

I also modded USD firmware to work with this board. Weather i still have it is something else.

 

James

[Atari 800 Help !]

It looks like extra ram switched at $D6xx? or maybe appearing at $D6xx? with a custom rom. is it PAL 800? if so, could be OS Rev B as no PAL 400/800 had rev B.

As for getting it going. Are you using a 9V AC power supply? one for 810 or 1050 will be fine. If so, it could be one of the ram boards, the CPU board or mother board acting up.

The power led runs from -5v from memory which comes from the ram boards.

 

James

[What was the 1050 Kiwi chip for 1050?]

BTW: I see a (homebrew?) mod around the trimcap aside the 2793, a 15k resistor and ceramic cap. What's its purpose?

 

re-atari

I actually have no idea. First time i noticed it. It looks like a factory mod. That trim cap is for the data separator built into the WD2793. Maybe it is for temp stability??

 

Here is a link on how to setup the data separator in the WD2793 that i found. http://www.s100computers.com/My%20System%20Pages/ZFDC%20Board/ZFDC.htm.

 

down near the end.

 

James

[What was the 1050 Kiwi chip for 1050?]

Thanks for the picture.

I have one of those.

It also has one pin that goes into the socket of the 6810 that was removed.

 

BR/

Guus Assmann

Correct. that is for R/W.

As a side note. The small chip is a HC version. The original maker tried a LS version but it kept playing up or wouldn't work properly or at all. Someone suggested to use the HC as it was faster....

Another note, when i modded the Supermax rom, i added a longer copyright notice to the beginning of the code only to find it wouldn't work. I eventually discovered that if the message didn't go over a certain length, the firrmware worked fine. Only thing i could figure out was a page boundary for a branch was crossed that upset the apple cart somehow.

 

James

[What was the 1050 Kiwi chip for 1050?]

Here is a pic of supermax. The 3 black wires go to a switch for normal 1050 firmware and supermax firmware.

 

James

[What was the 1050 Kiwi chip for 1050?]

Back in the 80's a mate of mine had a Supermax in his 1050. As you say it originated from Australia, IIRC it came bundled with SuperDOS. The upgrade was basically a tidied-up US Doubler. Just a plugin board containing a rom, an extra 6810 and an empty socket, no wires to solder. Installing it only required removing the 1050 rom and swapping the 1050's 6810 to the empty socket. The board plugged into the 1050 rom socket.

 

Although the Supermax did double density, the speed improvement was not very impressive. It was a big improvement over a stock drive, though. You could tell the difference in speed between his 1050 and my Copy Card 7 enhanced drive by just listening to the pitch of the datatransfer beeps and length of the pauses between those beeps. After seeing my 1050 in action he upgraded his drive with a CC7 within a few weeks and got rid of the Supermax.

 

re-atari

Supermax is a plugin board with one wire to solder. Remove 2 chips (rom and ram) and plug in this board. SuperMAX originally worked like USDoubler except for the special format command and had a delay removed. Also some protected software didn't load due to the removed delay. First thing i did when i got the super products for the 8bit was to dissemble the rom, add in the delay so the protected disks worked and added the Sparta special format command. I also thought about adding smart buffering as the upgrade has a 2K ram chip, ie buffer directory and sector map depending on DOS version but gave it a miss. I did however play around with adding commands to dump contents of ram etc just for giggles.

I still have blank boards.

 

James

[ATR-8000 (and other) CP/M System disks here]

; OUT
$20 ; printer data out (pin 13)

; IN
; printer control lines
; BIT 7 Busy
; BIT 6 Paper out?
; BIT 5 Select?
; Bit 4 Ack?

; OUT
$30 ; floppy control lines
; Bit 0 DSEL 1
; BIT 1 DSEL 2
; BIT 2 DSEL 3
; BIT 3 DSEL 4
; BIT 4 Master reset fdc ?
; BIT 5 Sidesel
; BIT 6 5-1/4" - 8" select?
; BIT 7 DD ENable

; IN OUT
; FDC
$40 ; Command/status
$41 ; Track
$42 ; sector
$43 ; Data

$50 ; In
; Bit 1 CTS/DSR or pin 11? Set by jumper
; Bit 2 Ring Ind
: Bit 4 Printer enable/disable jumper
; Bit 7 RS232 serial in
;------------------------------------------

; OUT
; Bit zero used to switch states.
$50 ; Atari serial output
$51 ; Rs232 serial output
$52 ; Rom enable/disable
$53 ; Printer strobe
$54 ; Index control flop set
$55 ; Rs232 out line. RTS/DTR Set by jumper
$56 ; Index control flop clear
$57 ; Atari cmd/data mux control

; IN
$70 ; Atati sio buss Z80 in
; BIT 1 Command
; Bit 3 +5v - Atari on
; BIT 7 Serial out, recieve data from consol

; CTC
; Bit 1 Start/stop count. =1 stop
; Bit 2 Time constant will/wont follow. 1= will follow
; Bit 3 When to start timer. Int t2 or external trig 1= trig
; Bit 4 Pos/Neg edge trigger. 1= pos
; Bit 5 16/256 divider. 1= /256. timer only
; Bit 6 Counter/timer mode. 1= counter
; Bit 7 channel int enable =1
$80 ; Channel 1 Tigg on SIO command and data?? Schematic correct?
$81 ; Channel 2
$82 ; channel 3 Trigg on rs232 data in
$83 ; channel 4

 

james

[SpartaDos 3.2d manual or help?]

Are you at a READY prompt?

if so, you are in basic.

 

type DOS <enter> then you should see D1:

 

from there, type DIR.

Else when booting, Hold down OPTION key when turning on. This will disable basic.

 

 

James

[ATR-8000 (and other) CP/M System disks here]

You make me want to open mine ATR8000 soon ! Rats ....

You can send it to me so i can open it on your behalf :D

 

James

[Question about irregular cycles in Atari Basic]

Never use basic for timing like this. Assembly is the only way to go

 

JAMES