24 May
2007
24 May
'07
10:23 p.m.
On Thursday 24 May 2007 16:53, Tony Duell wrote:
More seriosuly, I was once sort-of involved in a piece
of digital
design, and there was some combinatorial block that took in 3 bus
lines and outputted an enable signal to a buffer chip. Without even
thinking about the problem, I said 'I can do that in one chip'. One of
the others said 'OK, a PROM or a PAL I suppose'. I said 'No, A normal,
non-programmed chip from the TTL data bool'.
OK, which chip was I thinking off?
An 74138 3-to-8 demux? Or, possibly a 2-of-4 demux (74139), if you had
at least one line that had to be low.
Pat
--
Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org