PAL codes needed! / Mac Rebirth Project

Grant Stockly <[email protected]> Fri, 21 Jan 2005 10:01:17 -0900
Newsgroups gmane.os.openbsd.mac68k
Message-ID <[email protected]>
I am desperately looking for schematics and PAL chip documentation for the 
128k, 512k/e, and Plus.  If you have any idea where I can locate these, 
please let me know.  I am mostly looking for fuse map files for the 6 PALs 
on either the plus or the 512k/128k.  PALs for the 128k are just as good as 
the PLUS.  There is only one PAL different from the 128k to Plus, and I 
have a better version anyway.  My hotwired 512k mac has 4MB ram and a scsi 
port, runs 23% faster than a classic and runs at the same clock 
speed.  E-mail me if you're interested in the pictures.  :)

I have this schematic, 
http://www.digibarn.org/collections/diagrams/mac-512klogicboard/index.html
And have ordered the two sets of schematics available from 
http://w3.trib.com/~rollo/
PAL information from http://www.mactech.com/articles/mactech/Vol.01/01.11/PAL/

I do not have any other schematic/PAL information other than above, so feel 
free to add to my brain.  :)  PLEASE!!!  ;)

My goal is to replace all the ICs in the mac with current versions, get it 
to run on a protoboard, and then replace the processor with the "code 
compatible" 68HC020.  I found minix for the mac plus, but never tried it 
because the fact it ran within OS6 makes it seem like a joke.  I'm 
interested to know what kinds of modifications I would need to make at the 
68020 stage to make this custom computer run Net\OpenBSD.  Something with 
not having an MMU on the 68000 I guess.

Another goal is to have a computer that anyone who can handle .1" spaced 
lead soldering could build.  These days kids in a robotics club get a 1GHz 
SBC for $250, run windows XP on the thing with visual basic.  Do I need to 
say more?  :o|

1st Stage - Condition video signal for VGA multisync monitor (relatively easy)
2nd Stage - Replace all ICs with new higher speed CMOS equivalents (16MHz, 
compared to 8MHz)
3rd Stage - Build computer on protoboard
4th Stage - Replace processor with 68020
5th Stage - MMU?

If you've read to here, you're probably interested. ;)  Send me an e-mail 
and I'll notify you when I have the discussion forum up.

Thanks,
Grant