5038Re: [midatlanticretro] Altair 680 Project Update
- Mar 1, 2007Bill,
I have the TI TTL data book from that era which lists
both L123 and LS123 one-shots. The timing formulas are a
little different, but the parts are very similar. I am thinking
that you could probably use an LS123, and change the resistor
between Rext/Cext and VCC a little to get the same pulse width.
I can e-mail you the data sheet if you want. It might be very hard
to find a 74L part these days. (Or not. I haven't tried)
--- billdeg@... wrote:
> Unfortunately no, it has to be the 74L123.____________________________________________________________________________________
> > billdeg wrote:
> >> I am learning a lot about the Altair 680. It appears that the
> >> is OK, but as you can see from the latest pictures...
> >> http://www.vintagecomputer.net/MITS/680/pictures.html
> >> ...I am missing a chip, a 74L123. Might anyone here have a spare
> >> around?
> > Bill,
> > Would a 74LS123 be a suitable replacement?
> > http://www.unicornelectronics.com/IC/74LS.html has them for 27
> > Cheers,
> > Bryan
> > Yahoo! Groups Links
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