Odd 8-bit ISA CD-ROM interface?

Gordon JC Pearce gordon at gjcp.net
Wed Oct 18 16:06:19 CDT 2006

Ethan Dicks wrote:
> I have this board here, marked "Reveal / Part No. 14-004-008" with an
> FCC ID if BEJGCD-R420B.  It is an 8-bit ISA card with a few jumpers
> (1-4 and 1-9) and a single 40-pin IDC connector.
>> From a bit of googling, it seems to be an ancient CD-ROM interface.
> That would be interesting as it's 8-bit and AFAIK, ATAPI devices are
> 16-bit only. There's not much on the card - a couple of buffers ('244,
> '245), an address comparator ('688), and a wee bit of logic ('32 x 2,
> '08, '00)... nothing to, say, latch two 8-bit writes into a 16-bit
> register.
> Anyone recognize this beast?  Is it useful in anything besides a 
> DOS/Win3.1 box?

Probably some sort of Mitsumi interface.  I expect it would be useful as 
a fast-ish 8-bit parallel port...


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