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brenski

more questions than answers

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just bought this out of curiosity

from what i can see there's a XOS rom and twin SIO - all resembling the Christmas Lights' cables when you take them out of the box every December.

 

so from Pics attached can anyone identify exactly what's going on here, and more importantly - what are each of the switches intended to do?

 

post-39567-0-44032400-1450390440_thumb.jpgpost-39567-0-62773500-1450390450_thumb.jpgpost-39567-0-19314200-1450390459_thumb.jpgpost-39567-0-18304900-1450390466_thumb.jpgpost-39567-0-27511700-1450390474_thumb.jpg

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well the first thing I notice is that there is another ROM piggybacked on the normal OS ROM, so I'm guessing at least one of the switches changes OS. It appears that the left most switch changes the OS, though I'm not sure.

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Are they 256k RAMs? If so, RAM upgrade? Anything soldered on the back side of the board under 6520 (PIA)?

Edited by flashjazzcat

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The MMU mod is what interests me. I've never seen anything like that. The numbers are ground off of two of the chips on the board. Most of the switches go to that board.

 

Does anyone have any documentation on XOS? From preliminary testing, it looks like it contains the Rebound font.

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It's clearly a continuum transfunctioner...

 

Yeah no clue, but looking purely at the switches and not taking the wiring into account looks like:

 

X (?)

L (?)

R (Ram?)

O (OS?)

P (Pause?)

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Turns out a number of traces got burned up on this machine when the upgrades were fitted and the underside of the motherboard is a mess of solder and jumper wire. I did, however, desolder the EPROM from the OS ROM and dump it:

 

XOS - The Tool.bin

 

Tried running it in emulation but the reset vector points to $FFCF where it reads STRIG1 and promptly runs straight into garbage and crashes. I understand XOS is an 80 column OS, but I couldn't find another dump anywhere to compare it with. Anyone shed any light or know why it might crash?

 

EDIT: Bad dump first time (one of the legs is hanging off the 27C128). Boots now but still appears to be a corrupt image.

 

post-21964-0-32122300-1452026950_thumb.png

Edited by flashjazzcat

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This doesn't appear to be an 80-column OS, at least not what I've seen referred to as XOS/80. It has a built-in memory dumper instead. Once after boot, hit Ctrl+Shift+Tab, wait for the buzzer, then hit start. D1: will be formatted (!) and then have $03C0-BFFF dumped to disk starting at sector 1, and the following message placed on the last sector:

Sector 720 / $2D0 (128 bytes):
000: 01 02 03 04 05 06 07 08-09 10 11 12 13 14 15 16 |................|
010: 50 4C 45 41 53 45 20 52-45 53 50 45 43 54 20 54 |PLEASE RESPECT T|
020: 48 45 20 43 4F 50 59 52-49 47 48 54 53 20 4F 46 |HE COPYRIGHTS OF|
030: 20 41 4E 59 20 50 52 4F-47 52 41 4D 20 54 48 41 | ANY PROGRAM THA|
040: 54 20 59 4F 55 20 4D 41-59 20 42 41 43 4B 55 50 |T YOU MAY BACKUP|
050: 20 55 53 49 4E 47 20 54-48 49 53 20 44 45 56 49 | USING THIS DEVI|
060: 43 45 20 18 00 04 06 86-20 52 45 56 FF 30 31 FF |CE ..... REV.01.|
070: 16 15 14 13 12 11 10 09-08 07 06 05 04 03 02 01 |................|

As for the crashes, it's a hybrid OS-B/XLOS ROM. C: and P: appear to be present, but anything that uses the PBI routines will crash.

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A short review in Page 6 for XOS/80 Column Pack:

 

XOS-80 Column Pack.pdf

 

"The Tool"... wasn't that a separate product? It seems like I've heard of that before, maybe from one of the cart collectors on here. It's kinda hard to do a search on something as generic as "The Tool" though...

 

  • Like 1

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Turns out a number of traces got burned up on this machine when the upgrades were fitted and the underside of the motherboard is a mess of solder and jumper wire. I did, however, desolder the EPROM from the OS ROM and dump it:

 

attachicon.gifXOS - The Tool.bin

 

Tried running it in emulation but the reset vector points to $FFCF where it reads STRIG1 and promptly runs straight into garbage and crashes. I understand XOS is an 80 column OS, but I couldn't find another dump anywhere to compare it with. Anyone shed any light or know why it might crash?

 

EDIT: Bad dump first time (one of the legs is hanging off the 27C128). Boots now but still appears to be a corrupt image.

 

attachicon.gifxos.png

 

A hex editor reveals some text in the Dump: "SUPER CHIP! ©1986 COMPUTER SUPPORT (UK) LTD" - There were three versions advertised, one for 400/800, one for XL/XE and one for 130XE.

 

Given that the BB0001 version number is in the ROM, perhaps this is the XL/XE version? (Which, I've just realised may be why it's in an 800XL... D'oh!)

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this could use a real close look, and a final report of exactly what all it's got, the modification switches and the XOS rom/the tool/xxxxxx combined prom. all that spaghetti and the add on may not just be reworked traces but also modifications to switch things in and out.

Edited by _The Doctor__

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