Hi there,

GREAT work! Is there any chance to have the PIC source code? Here at our Computer Museum we really want to make a sort of Apple 1 mini prototype (or something else!)

Thank you all, I will check that tomorrow! They are 4116. I'm lucky to have a lot of those chips :)
How old are those 4116s? If they are 1980s vintage I'd be a bit leery of using them.


I was wrong! I have TONS of 4164 but no 4116 :) I'm ordering them from a reseller here in Italy; they have ...

Thank you all, I will check that tomorrow! They are 4116. I'm lucky to have a lot of those chips

(I also found a way to change the 4116 with 4164 but seem a bit complicate but interesting: http://www.osiweb.org/osiweb/misc/4116to4164.txt )

One comment - the 8032 (even the -SK) does not have a PLA. All address decoding etc is done in TTL logic. The 901447-10 is a ROM chip - in this case the character ROM that produces the characters on the screen.


my fault! :) I was confusing PLA with ROM :)


Also check if the interrupt line ...

Hi there,

this is our second fix attempt, a COMMODORE CBM 8032SK. The problem can be seen at this URL:

http://museum.freaknet.org/index.php/Commodore_CBM_8032SK

The CBM power on but it "chirps" only sometimes. When it chirp, a bright line with 40 "-" and 40 spaces is printed at the center of ...

Thank you for this, we fixed that page with the new informations! :)

Please excuse us for errors in pages, we're starting our serious work; we had very hard years in which we only stored our pieces in some deposits, and we decided to rent a space for our Museum only some months ago; so we really ...

Thank you, this just confirm my thoughts :)

Well, I fixed my 8296 just replacing UE5 with an EPROM using an handwired adaptor, but i'm just collecting information in case of a new failure :) This daughter board was very weird to me.

A picture of that board is here:

http://museo.freaknet.org ...

...also the schematics and info on that German page is very confusing!

Can anyone help also with that?

Hi everybody,

we at our computer museum are trying to restore our Commodore CBM 8296; it was working some years ago but suddendly stopped working.

I suspect the PLA chips UE5 and UE6, I measure weird TTL levels on them so I'm changing them as explained on http://www.vic20.de/html/eprom_pla_8296 ...