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Upgrading M4 to 128k, how?

BartH

Experienced Member
Joined
Mar 11, 2015
Messages
72
Location
Netherlands
I have a M4P and a M4, both are 64k machines. For a special project I need one of them to be 128k, preferably the M4. As far as I know both of them are Non-GA's but I'm not quite sure if this differs, and how to be 100% sure. What is needed to do the upgrade, apart from the 4164 chips?

Bart
 
If I remember correctly, when I upgraded mine I had to remove the bypass caps next to the RAM IC sockets for the HIGH Bank. Then I had
to remove the Jumper DIP and Insert the PAL at U72.

TRS-IAN is the only source for the programmed PAL U72 that I know of. He frequents this forum and will likely respond.


Larry
 
As a minor clarification, the Non-Gate Array Model 4P already has the required PAL installed; it is only the Non-Gate Array desktop Model 4 that needs a 'U72' PAL.
 
Thanks guys for your help! The link to the PDF answers all my questions at once! I'll contact Ian for the chip.

Bart
 
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