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 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
Motorola MC68705P3S: how to extract firmware?
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CYBERYOGI =CO=Windler



Joined: Aug 05, 2012
Posts: 10
Location: Germany

PostPosted: 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?

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cappy2112



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PostPosted: 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.

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CYBERYOGI =CO=Windler



Joined: Aug 05, 2012
Posts: 10
Location: Germany

PostPosted: Sat Aug 25, 2012 2:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

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?

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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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