[Diy_efi] TCCS 6801 ROM extraction

[SIMON HART]

Not 100% sure but the 6801 is the only device I have found that matches the
position of the power rails and the xtal i.e. vss pin 1 vcc pin 7, xtal
pins2,3 etc. None of the other 40 pin micro's match, including 8051, PIC,
68HC11 etc. even the 6800, 6803 dont match, but I havent checked the hitachi
vaersions of the 6801 i.e. HD6301.
Isnt there a way of writing some code in an external EPROM that will read
out the internal ROM? I think some of the GM ecu's have 6801 with masked ROM
have a look here: http://www.cruzers.com/~ludis/spit.html  also try here
http://www.diy-efi.org/diy_efi/archive/1997-October/msg00583.html it must be
possible to do so that they can test the uC after it has been produced.

The MR-2 ecu is located in the boot behind the trim panel next to the engine
bay u need a 10mm socket from what i remember, to remove the trim panel you
push the center of the round trim clips in then lever them out.





---------------------------------Original
Message----------------------------------
From: Jerry Wills [mailto:jswills at attbi.com]
Sent: 02 August 2002 00:18
To: SIMON HART
Subject: TCCS info


Sounds like you have a better shot at possibly getting the data out.
If I can help you with yours, it may be a replacement for mine.
Are there wiring diagrams and service manual pages online?
I'll take a look at a 6801 data sheet, there may be a number of 
versions of that chip, some with rom,or eprom, or eeprom and you
may have to remove it and put in another "test board" to get the
data out of it. Unless it can be dealer updated/reprogrammed you
may have to change it for a reprogrammable version or a small card
that attaches to the original pads/traces and has a seperate eeprom/
flash that you could play with.
How sure by the pins you traced that it is in the 6801 family?

I'd like to see this work.

for your reference PCB layout, assembly, testing of all kinds of
microprocessor/controllers from 79 thru 99 in a research environment
was my mainstay.

your lucky that your parts were renumbered, that gives us half a chance.


Jerry Wills

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