What is this cartridge?

By gdx

Prophet (3910)

gdx's picture

29-11-2020, 10:50

The inscription suggests that it is an FDD interface but there is no disk controller inside, only a PPI, a ROM and 3 small chips.

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By T.R.

Rookie (31)

T.R.'s picture

29-11-2020, 13:15

I'd say there are two possibilities. Either the 8255 itself is used as an FDD controller, or this is a proprietary interface where the actual FDD controller was built into the drive itself.

There are some places online which mention the 8255 used as an IDE controller, but I can't find any mentions of the 8255 used as an FDD controller. There are some mentions of the 8255 being used as an *interface* to an FDD controller.

By st1mpy

Hero (604)

st1mpy's picture

29-11-2020, 13:35

It appears to be a Beer IDE cartridge (8255, eprom, 30, 32, and if the middle one is 04). It could just be used as any 8255 ppi control board depending on whats on that eprom. This reminds me, I need to sell the ones I made out of pcbs I bought on ebay.

By gdx

Prophet (3910)

gdx's picture

29-11-2020, 15:34

Indeed, it looks a lot like a Beer interface.

By djh1697

Paragon (1508)

djh1697's picture

29-11-2020, 16:41

My beer interface in my mouth Wink

By Danjovic

Master (175)

Danjovic's picture

29-11-2020, 17:36

Did this cartridge provide any label?
Can you post pictures of the bottom side of the board?
Can you dump the rom contents?

By gdx

Prophet (3910)

gdx's picture

30-11-2020, 01:45

I put all I know in the wiki.
https://www.msx.org/wiki/MSXFDD-S31