Hi Guys i am looking for a copy of the roms for a SYSCOM II clone, if someone does have it i would really need a copy as i am stuck with my restoration project
Thanks Marco
Anonymous
User login
Please support the defense of Ukraine.
Direct or via Unclutter App
Active forum topics
Recent content
Navigation
No Ads.
No Trackers.
No Social Media.
All Content Locally Hosted.
Built on Free Software.
We have complied with zero government requests for information.
According this link, it seems to be that the Syscom II system used pirated Apple + ROMs, instead own developed ROMs.
https://www.applefritter.com/comment/5099#comment-5099
But I'm not sure about
Kind regards
Torsten (aka tokabln) - Berlin, Germany
Hi Torsten,thanks for you insight, yes i am researching all topics regarding this clone but it seems that the original Apple II+ Roms do not work on it. I have merged D0+DF,E0+EF,F0+F8 into 3 eproms as the board has onle 3 EPROM spaces assuming they would work, but the copmputer is dead as if no ROMS were installed, seems on the orriginal board there was only the F0-F8 ROM, with that it does show some signs of life but i did read this EPROM but seems to be suffering from BITROT syndrome as i have also tried to disassemble the actual ROM and parts make are understandable and similar to the original Apple II+ but a lot of garbage in there.
There is so little information on the net regarding this clone, any information is helpful thanks
You can try to readout an unstable eprom by reducing the supply voltage. If a bit is flipping to 0 (zero) then, this cell is marginal. With this information and different readouts (using different supply voltages) it's sometimes feasible to recreate the original content. But it isn't a 100% reliable methode.
I believe Tom Owad may have one.
Hi David, thanks for the headsup but he has not :(
Seems that this clone has only 3 eproms in it i assume they are devided into D0/d8 E0/E8 and F0/F8 i have managed to read the F0/F8 rom but it does not even look similar to the original F8 of the Apple II+ is there any expert that can help me out here.
I managed to get the logo to appear so the monitor rom is working, but i am not sure why
Anyone out there have a disassembler for 6502?
Disassemblers for the world of the 6502s:
http://6502.org/tools/asm/
I've written my own as many people did. This one is similiar to the DASMx 1.40 (which I preferred) but it runs with OS-9/68k.
Regards
Ralf
Thanks for the link Ralf
Did you ever find your ROMs? I have a syscom ][ somewhere.
If the ROMs are not on asimov yet, but you have a machine, then go for it: dump & upload the ROMs. Someday someone will be really grateful. (And "someone" might also be you yourself - if the machine ever stopped working).
Would be interesting to see how and if at all the ROMs differ from the Apple II+ (apart from the 8 bytes for the boot ID: "APPLE ][" => "SYSCOM 2").
I actually did find a copy but do have other issues on the board, it does turn on now with the logo and cursor, but does lock up if i try anything, to be honest it as very rusted and i am working on it.
Will take me a bit of time as work is getting in the way :) but i'll get there.
Didn't think of uploading them, will do today. Thank you all for the interest
BTW the difference between them is that the SYSCOM used a bit flipper to avoid copyright issues
I was going to say, it's probably bitflipped in some way. If you can find out the (likely simple) method, you could make regular Apple ROMs (or adapters for the sockets to do the flip).