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 photo.JPG | 2.53 MB |
Hello! Can anyone identify this card? It has a eprom with v3.1 label and is from Apple. It has the numbers 8151 on the back of the card and apple copyright of 1981
Anonymous
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This is not a card produced _by_ Apple. Not in 1981. It would be interesting to dump that ROM...
It kind of looks like it could be a prototype of some kind.
c
I wonder if it's some apple printer prototype printer interface?
i´d agree it to be a prototype card.....
but i´d disagree it to be a printercard - there is no kind of communicationport to any kind of peripherial.....
looks more like a card for testing internal parts of ROM´s
in fact there is only 1 PAL replacing the normaly present logic.... and the EPROM itself with program....
so it´s probably a card for testing part´s of internal firmware revisions -
like videorom languageversions or similar...or it might be used for diagnostic´s i.e.RAM-Diags or similar....
dumping the EPROM should uncover it´s usage....
speedyG
In fact, there are two Proms on the board, 256 byte and 2k byte. With an image of the other side, one could figure out exactly how the hw is set up. Once that is figured out, I'm sure you could dump or run the firmware. Speculating here - it is set up to respond to I/O select and I/O strobe ranges and since it doesn't have I/O select logic, it will not play well with other I/O cards.
Mike W
I would guess that the PAL chip is some kind of address decoder to make the ROM appear at an address that it wouldn't usually appear at it's usual guise. Maybe some kind of monitor?