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Re: Unusual Apple // card
- Subject: Re: Unusual Apple // card
- From: Stephen Shaw <xstephenx@apple2.org.za>
- Date: Sat, 23 Mar 2002 22:20:19 +0000 (UTC)
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On Fri, 22 Mar 2002 11:42:43 +1100, John L wrote:
> I have obtained an Apple // card whose purpose I can't easily
> identify. The card is called "The Micro Works" with the letters
> "DS-65 (c) 1979" printed directly underneath the title - which is
> located on the top left of the card.
>
> On the card itself are a number of small IC's labeled "74LS85N" and
> one large IC labeled "F6821P". There is also an " DS-65 EPROM II"
> which is socketed as well. On the top of the card are three trim pot
> wheels with the letters "B" "C" and "W" respectively labeled above
> each pot.
The 6821 is for the 6809 series of processor. The 6809 was similar to the 6502
so it will work with an Apple. At a guess I'd say it is similar to a 6551 VIA.
6821=6551????
>
> I have a picture at this URL (A bit unclear) if anyone wants a look:
>
> http://www.zip.com.au/~jlogo/microw.jpg
>
> The card >looks< like a video card of some sort but I'm unsure since I
> can't find any documentation for the card. A google search reveals
> nothing as well.
--
Some drink at the fountain of knowledge, others just gargle