|SuperPET ComboBoard Revisions||by Bill Degnan - 11/05/2014 22:17|
I have a SuperPET ComboBoard with a bad 970018-12 (slot U47)...I assume there is no source for the original ROMS...From what I found on the web, this is just a 2764. I will try to make a copy of the one good ROM.
I found this site
SuperPET Waterloo $A and $B (U47) A000 - BFFF
Anyway, soon I will see how it goes to make a replacement ROM from scratch.
Regarding the two spare Combo boards I have on hand; one is an original Combo board, and one a "Rev D". Both boards are good other than the one bad ROM that I have to share between the two.
I did not realize there was more than one rev of the SuperPet Combo board. The big difference is that J2 (the switch port) is in a different position. U47 is socketed on the rev D board, perhaps it was already replaced once before. If so, this is another indication that something caused the ROM to go bad and I need to track down the problem. The ROMs on the boards are the same part numbers however.
The Combo board I have in my SuperPet is an original rev. I do not have a two-board SuperPet.
J2 position orig vs. Rev D
Orig and Rev D side by side
Rev D ROMs
|SuperPet U47 - not a 2764||by Bill Degnan - 11/09/2014 08:13|
As far as I can tell, the ROM in slot U47 of the SuperPet Combo board is NOT a 2764. The ROM is 24 pins, 2764 is 28. Tried to read anyway, came up all FF FF's.
So...is this page wrong? (see U47):