[Coco] 64 K upgrade for COCO 1 gives ?OM ERROR
John E. Malmberg
wb8tyw at qsl.net
Sat May 2 18:00:12 EDT 2020
I have a COCO 1 later grey case with the non-chicklet keyboard.
It was has a 16K memory badge.
While the computer had 16 K memory in it, I was able to verify that it
had BASIC 1.1 ROM in addition to the ECB ROM.
I tried to put 64 K using 2164 memory chips.
The circuit board had 4 jumpers to move to go from 16 K to 32 K, which I
moved to the correct locations.
The circuit board has a jumper set labeled high / low.
The computer boots, displays the sign-on for Extended Color Basic 1.0.
It reports ?OM ERROR for any command given.
More information about the Coco