The 1791-02 is a floppy disc controller (8" & 5.25") and
the 6821 is a peripherial interface adapter (PIA) running at
1 MHz. THe PIA is basically a dual-byte parallel port.
If you're desperate for the chip info, let me know off-list...
Bill McDermith
----- Original Message -----
From: "Andreas Freiherr" <Andreas.Freiherr_at_Vishay.com>
To: <classiccmp_at_classiccmp.org>
Sent: Friday, February 01, 2002 8:23 AM
Subject: Re: Smoke Signal Broadcasting DCB-4E
>
> No docs here, but it sounds like a floppy or hard disk controller
> (ST-506).
>
> The MC6821P is the 1MHz (slowest) version of Motorola's PIA (parallel
> interface adapter) for the 6800 family of 8-bit-processors, that's for
> sure.
>
> Andreas
>
> Joe wrote:
> >
> > Does anyone know exactly what a Smoke Signal Broadcasting DCB-4E
cards are
> > for? It's and EXORbus card and has a MC6821P and a WD FD1791B-02 LSICs
and
> > a lot so SS TTL ICs on it. Does anyone have data for the card?
> >
> > Joe
>
> --
> Andreas Freiherr
> Vishay Semiconductor GmbH, Heilbronn, Germany
> http://www.vishay.com
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Received on Fri Feb 01 2002 - 10:44:11 GMT