[Free] Old Data Books (Australia)
bfranchuk at jetnet.ab.ca
Wed Sep 5 23:02:24 CDT 2007
Ethan Dicks wrote:
> Ah... good to know. The PDP-8/L and -8/i have a 7483 on each M220
> card, but I remember seeing either a 74283 or, if it exists, a 74183
> in the design for that PDP-8/i work-alike I mentioned here a few weeks
> ago. The difference, I would guess, is probably that the designer of
> the clone didn't want to fiddle with an older, odd chip.
Unicorn electronics still have 74XX listed but many of the chips
are (Discontinued -- limited to stock on hand). Oddly the 7483 does
not state that. They also may have 7482's -- dual adder,
as I think they where used the original PDP-11.
> I should probably find a source of a handful of 7483s since I have a
> small stack of dead M220s. I don't know what's wrong with them yet
> (probably dead 7474s if the rest of the machine is any indication),
> but I'd hate to trace it to the adder and have no spares on hand.
Where do most people get their spares from?
> I did not realize it was a strange-power-pin part. I would have
> figured it out eventually, but it's best to be forwarned.
Ben alias woodelf
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