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From: dempson@actrix.gen.nz (David Empson)
Subject: Re: How to replace the "triangle chip" on Apple Super Serial Card?
Message-ID: <Cx91B2.DtE@actrix.gen.nz>
Organization: Actrix Information Exchange
References: <36ut57$ruk@news1.digex.net> <dchiuCx8DpC.CCJ@netcom.com>
Date: Thu, 6 Oct 1994 11:30:38 GMT
Lines: 47
In article <dchiuCx8DpC.CCJ@netcom.com>,
David C.W. Chiu <dchiu@netcom.com> wrote:
> In article <36ut57$ruk@news1.digex.net>,
> Christoph Berendes <berendes@access4.digex.net> wrote:
>
> >I'd rather not replace the whole Super Serial card. Anyone have any leads
> >on where I might find just that little chip? I suspect it's apple
> >proprietary, and a first round of phone calls to local repair shops
> >supports this.
>
> That isn't a chip, but a jumper block. I no longer recall the internal
> wiring, but you can probably figure it out using a multimeter...
Or look at the original (Apple II+ generation) manual for the card,
which has a full circuit diagram, and shows the internal wiring of the
jumper block.
It is a 16-pin jumper block, wired as follows:
1 --\ /-- 16
| |
2 --/ \-- 15
3 --\ /-- 14
| |
4 --/ \-- 13
5 ------- 12
6 ------- 11
7 ------- 10
8 ------- 9
i.e. 1-2, 3-4, 13-14, 15-16, 5-12, 6-11, 7-10, 8-9.
The arrow points to the right side (pins 9-16) in the above diagram.
With the jumper block inserted into the card and the arrow pointing to
MODEM (up), the card is in its "standard" configuration, with pin 1 in
the lower left corner.
--
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand