PC Speed schematics

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tOri
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Re: PC Speed schematics

Post by tOri »

Hi all,

As I promised some posts above - all documentation about PC-SPEED is available on my page FOR FREE:

diagram, pcb gerber files, GAL jed files

http://atari.myftp.org/pcspeed/pcspeed.html

You're Welcome.

Please use google translator to read text because site is in polish language.
You need Pc-speed software available on Atarimania site and MS-DOS boot disk. I tested emulator and it work under MS-DOS 6.22 well.

http://www.atarimania.com/utility-atari ... 23201.html

I'm searching for Sack's AT-speed emulator :)

-> joska - try to fix your device and write about success or fail, thanx.

regards
tOri
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backup addresses not up todate: http://raven1.magix.net http://atari.000space.com
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czietz
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Re: PC Speed schematics

Post by czietz »

tOri wrote: Fri Jan 28, 2022 11:09 pm As I promised some posts above - all documentation about PC-SPEED is available on my page FOR FREE:
Thank you so much! This will be invaluable if I ever damage my PC-SPEED during testing.
joska
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Re: PC Speed schematics

Post by joska »

tOri wrote: Fri Jan 28, 2022 11:09 pm -> joska - try to fix your device and write about success or fail, thanx.
Thank you so much for this! Yes, I will now attempt to get my PC-Speed working :) Need to finish a couple of other projects first simply to clear some space on my workdesk.
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tOri
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Re: PC Speed schematics

Post by tOri »

joska wrote:

"Yes, I will now attempt to get my PC-Speed working"

fingers crossed :)
http://atari.myftp.org
backup addresses not up todate: http://raven1.magix.net http://atari.000space.com
various varieties for Atari and not only - useful or not, but it's worth a look ...
joska
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Re: PC Speed schematics

Post by joska »

That was quick :) I just replaced the GALs, did not do any other repairs or checks. Before this pc_speed.prg would not detect the presence of PC Speed. Now I just have to find my DOS boot-disk and see if the emulator actually works...
2022-01-29 14.29.06.jpg
This is in an otherwise stock Mega 2. No harddisks connected (yet).
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tOri
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Re: PC Speed schematics

Post by tOri »

It was really quick :) I'm sure it is working good because you see pc-speed boot screen.
I'm curious about old GALs operationality. Maybe they simply are deprogrammed by time?
You can check it using programmer.

Anyway - gratulations Joska :)

My hard work looks useful. I am happy...

regards
tOri
http://atari.myftp.org
backup addresses not up todate: http://raven1.magix.net http://atari.000space.com
various varieties for Atari and not only - useful or not, but it's worth a look ...
joska
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Re: PC Speed schematics

Post by joska »

Have not checked the old GALs yet, will do it later this weekend.
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joska
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Re: PC Speed schematics

Post by joska »

Tried booting MS-DOS 3.31 and it appears to work fine. So my PC-Speed is back :) Again, thanks a lot tOri.
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tOri
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Re: PC Speed schematics

Post by tOri »

VERY IMPORTANT INFO:

I have to warn everyone who uses devices with old CPLDs like the GAL or memories like EPROM, EEPROM. It looks like they might come lost single configuration bits due to aging and for some other reason. Datasheets mentions about 20-30 years of data retention. Only way to keep these working for next years is to reverse engineer all logic inside secured chips and reprogram they like new. Don't be surprised when your beloved device stop working someday due to single bitflip... I ask everyone who can help with it and can contribute old devices for reverse engineering before they'll completely die...Not all will be rebuilt because some devices are secured by custom chips, but some can be...
It will be a serious problem for all vintage computing...
http://atari.myftp.org
backup addresses not up todate: http://raven1.magix.net http://atari.000space.com
various varieties for Atari and not only - useful or not, but it's worth a look ...
joska
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Re: PC Speed schematics

Post by joska »

joska wrote: Sat Jan 29, 2022 2:55 pm Have not checked the old GALs yet, will do it later this weekend.
Both the old GALs could be programmed and successfully read back, but when I reinstall them my PC-Speed does not work. So there's something fishy with atleast one of them. I will not spend any more time on this as it works perfectly with the new GALs.
Last edited by joska on Sun Jan 30, 2022 12:39 pm, edited 1 time in total.
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tOri
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Re: PC Speed schematics

Post by tOri »

Really - it looks strange and is not obvious. Not all pins are involved in the programming process of GAL. I suspect that one of the outputs is damaged.

regards
tOri
http://atari.myftp.org
backup addresses not up todate: http://raven1.magix.net http://atari.000space.com
various varieties for Atari and not only - useful or not, but it's worth a look ...
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tOri
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Re: PC Speed schematics

Post by tOri »

BTW:

Atari PC Supercharger is not reversable in a simple way because an ASIC used in this device.

GATE ARRAY.jpg
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http://atari.myftp.org
backup addresses not up todate: http://raven1.magix.net http://atari.000space.com
various varieties for Atari and not only - useful or not, but it's worth a look ...
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