S-100 Polymorphic Systems card questions

From: Randy McLaughlin <randy_at_s100-manuals.com>
Date: Mon Dec 27 12:55:52 2004

----- Original Message -----
From: <Saquinn624_at_aol.com>
To: <cctalk_at_classiccmp.org>
Sent: Monday, December 27, 2004 12:38 PM
Subject: S-100 Polymorphic Systems card questions


> I have a S-100 based system that seems to mostly run, but I have some
> questions on the video card.
> It is a Polymorphic Systems card, but looks different from all the
> examples I
> could find on the internet
>
> Markings are: Polymorphic Systems (c) 1976 I.P.C VIDEO rev 0.0, with most
> chips aligned vertically
>
> The keyboard? port is a 14 pin DIP socket in the upper R.H. corner, next
> to a
> 8212 I/O chip.
> Between this and the VIDEO marking, there are some pads with heat damage
> that
> have the symbol for Zener diode across one of them. I have no idea what
> the
> component specs are for these pads.
>
> Also, 2 questions: does anyone have the DIP switch settings table for this
> card? 7 switches, currently set at 1 1 1 1 0 0 0
>
> and (2) the 8212 interface makes me think that the keyboard is some sort
> of
> parallel interface, but the computer came with a DIP header connected to 3
> wires
>
> (bonus question: this card has some jumper wires and a resistor soldered
> on
> the trace side of the PCB, is this official, or is this a hack? the joints
> look
> sort of "hacky" the resistor goes between +Vcc and pin 20 of the 6571AL,
> the
> jumpers are between some of the 74XXX gates on the L.H. side of the card
> [where the 7805 V.R. is])
>
> found it at my church garage sale several years ago, so I can't "ask the
> owner"
>
> Scott Quinn


You can find the manual for it on my website:

http://www.s100-manuals.net/Harte-manuals/PolyMorphic/index.html


Randy
www.s100-manuals.com
Received on Mon Dec 27 2004 - 12:55:52 GMT

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