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CYBERYOGI =CO=Windler
Joined: Aug 05, 2012 Posts: 10 Location: Germany
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Posted: Thu Aug 16, 2012 7:06 pm Post subject:
Motorola MC68705P3S: how to extract firmware? Subject description: mind machine with tekkno sound, Want to dump ROM |
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I own a mind machine from 1990 with CPU Motorola MC68705P3S (28 pin DIL, eprom based microcontroller with 2KB) and grainy POKEY-like tekkno noises. I want to backup it to prevent bitrot, but my eprommer (Willem Pro 4 isp) does not support it.
I only found a dead link about the tech details:
http://matthieu.benoit.free.fr/pdf/How_to_read_the_MC68705U3_EPROM.pdf
Does anybody know how to build an adapter or other *simple* DIY circuit to dump its rom contents? _________________
Code: | MAY THE SOFTWARE BE WITH YOU!
*============================================================================*
CYBERYOGI Christian Oliver(=CO=) Windler
(teachmaster of LOGOLOGIE - the first cyberage-religion!)
!
*=============================ABANDON=THE=BRUTALITY==========================*
{http://weltenschule.de/e_index.html} |
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cappy2112
Joined: Dec 24, 2004 Posts: 2465 Location: San Jose, California
Audio files: 2
G2 patch files: 1
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Posted: Fri Aug 24, 2012 9:11 pm Post subject:
Re: Motorola MC68705P3S: how to extract firmware? Subject description: mind machine with tekkno sound, Want to dump ROM |
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CYBERYOGI =CO=Windler wrote: | I own a mind machine from 1990 with CPU Motorola MC68705P3S (28 pin DIL, eprom based microcontroller with 2KB) and grainy POKEY-like tekkno noises. I want to backup it to prevent bitrot, but my eprommer (Willem Pro 4 isp) does not support it.
I only found a dead link about the tech details:
http://matthieu.benoit.free.fr/pdf/How_to_read_the_MC68705U3_EPROM.pdf
Does anybody know how to build an adapter or other *simple* DIY circuit to dump its rom contents? |
This may be a good lace to start, but probably isn't exactly what you need.
http://ppep.sourceforge.net/schemas.php
You may try posting this message in the Nuts & Volts forums,
as well as Circuit Cellar. I would be surprised if this project hasn't been in those magazines. Dumping roms was quite common and isn't that complicated (although I've never built a circuit to do that, I always had access to a commercial rom burner).
Try googling/binging for other variations of "build rom reader", build eeprom reader", etc.
There are 1000's of DIY sites out there that are likely to have the resources you need. _________________ Free Tibet. Release the Panchen Lama from prison. Let the Dalai Lama return to his home. |
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CYBERYOGI =CO=Windler
Joined: Aug 05, 2012 Posts: 10 Location: Germany
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Posted: Sat Aug 25, 2012 2:58 pm Post subject:
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The PPEP thing doesn't look too different from the Willem eprommer.
By the way, the French dead link seems to work again. They describe a mechanism that counts clock cycles and such complex stuff to conclude bits by a hacked write-verify mode (simulated writing without Vpp voltage), and it fails to read the last byte. On the French website is plenty of unsorted info (partly in French language only). There is also schematics for a copier device (a bit much work for me to wirewrap that thing to only read one chip - I have no access to PCB making equipment).
- Is there an easier way (e.g. Willem adapter) to read this microcontroller? _________________
Code: | MAY THE SOFTWARE BE WITH YOU!
*============================================================================*
CYBERYOGI Christian Oliver(=CO=) Windler
(teachmaster of LOGOLOGIE - the first cyberage-religion!)
!
*=============================ABANDON=THE=BRUTALITY==========================*
{http://weltenschule.de/e_index.html} |
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