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Upgrading M4 to 128k, how?

BartH

Experienced Member
Joined
Mar 11, 2015
Messages
68
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
 

ldkraemer

Veteran Member
Joined
Mar 14, 2013
Messages
2,227
Location
Chaffee, MO
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
 

lowen

Veteran Member
Joined
Jan 16, 2014
Messages
1,517
Location
Western North Carolina, USA
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.
 

BartH

Experienced Member
Joined
Mar 11, 2015
Messages
68
Location
Netherlands
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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