Analog modem emulator?

[Vintage Computer Festival]

On Tue, 9 Aug 2005, Tony Duell wrote:

> > > So what is suprising that the Apple 'went backwards' from a card with
> > > hardware serial conversion to a bit-banger.
> >
> > Maybe they didn't?  What's the copyright date in the Apple Serial Card
> > manual?  I'll check the one in the Communications Card manual.
>
> You are going to love this...
>
> I can't find the manual for the bit-banger card (I know I have it
> _somewhere_). I did find one of the actual cards, the PCB etch and the
> PROMs are copyright 1978.
>
> I also found the manual for the Communication Card you have. It's _also_
> copyright 1978, the date on the schematic and source listing in the
> manual are 1978 too...
>
> Sounds like the cards were approximately contemporary.

That's perfectly reasonable.  It could be that the Serial card was meant
for local interfacing to serial peripherals while the Communications card
was meant for "high-speed" telecommunications applications.

I'll try to remember to check my manuals later today and see if each
manual indicates the intended use of each card.

-- 

Sellam Ismail                                        Vintage Computer Festival
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International Man of Intrigue and Danger                http://www.vintage.org

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