Re: Apple II card ID

[dempson@atlantis.actrix.gen.nz (David Empson)]

In article <sbeattie.794178546@stimpy.cs.iastate.edu>,
Shawn T Beattie <sbeattie@cs.iastate.edu> wrote:
> I'm trying to identify the following Apple II card:
> 
> It says Cardiocomp C1 Intelitool, Inc. Copyright 1986.

Just from the name, I'd guess it was supposed to connect to some kind
of heart monitor.

> It has only about 6 chips on it, a DIP, and a modular jack on 
> it, smaller than RJ11, but 4 pins -- similar to a phone
> handset jack.  Chips are labeled XOR, CLK, BUF, AD, INA, and
> VI A.

XOR is probably just an exclusive-OR logic gate.  What numbers are
written on the chip?  CLK is probably a clock chip, BUF is probably a
buffer, AD is probably an analog to digital converter.  No thoughts on
INA.  Any other identifying marks?

I assume these labels are on the circuit board, not on the chips
themselves.

> The largest chip (VI A) is Rockwell, R6522APE.

That is a Versatile Interface Adaptor, which is a multifunction
parallel I/O chip with 16 I/O pins that can be individually configured
as inputs and outputs.  It also four control lines which can be used
for handshaking, a shift in/shift out function, and a couple of timers.

In this case, it is probably being used to interface to the A/D chip
and other circuitry on the board.
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand