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Re: Apple II Interrupt card
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In article <3E7903B7.4080809@nowhere.net>, Default <noone@nowhere.net>
top-posted (grr):
>Exegete wrote:
>> Or, I'd be willing to part with one of the two cards I have, if you are
>> morally certain that you can create a similar card, and that would seem
>> to be the only way to get Contiki running on a II
>
>As for recreating the Interrupt Manager card, I suspect that I could do
>that Roy. I have the skills necessary to replicate the circuit. I
>suspect that I could draw a photo ready circuit board fomr someone to
>etch too. But I think I could simply attach it to the main board with a
>socket connector.
If the goal is to have something that'll run on just the IIe, this might
work. If you want it to work on a II/II+ as well, sticking with an
expansion card would be the better way to go...instead of the MMU and IOU in
the IIe, the older machines have a ton of 74LSxxx parts.
Having boards made is relatively simple, and it'd be easier than trying to
roll your own double-sided board. I have an order in with Olimex for a
couple of different boards; one of them is a 1-Wire interface board that
plugs into the joystick connector. Their pricing for double-sided boards
with silkscreen and solder mask is $26 for up to 160x100 mm. I shoehorned a
dozen 1-Wire boards into that space. While you probably won't fit a dozen
interrupt cards into that space, it should still be possible to fit more
than one in there. With either through-hole or surface-mount parts, the
card would be very small. Given what's been mentioned previously, parts
cost for a board and the chips to go on it should be well under $10...I'm
guessing somewhere near $5, give or take a bit.
If someone wanted to sell/loan/give me an interrupt manager card to trace
out for purposes of cloning it, I could get the job done. The final product
could be provided either as a bag of parts (cheap and fast) or an assembled
board (a bit more expensive, and it'd take a bit longer).
_/_ Scott Alfter
/ v \ salfter@salfter.dyndns.org
(IIGS( http://alfter.us Top-posting!
\_^_/ pkill -9 /bin/laden >What is the most annoying thing on Usenet?
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