14 Oct
2007
14 Oct
'07
2:03 p.m.
On 10/14/07, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
The only 8-pin TTL chips I (just) rememebr the 7456
ands 7457 (I think)
which were /50 and /60 counters (desigend to get 1Hz clocks from European
or US power lines)
Those sound handy (since digital horology is one of my hobbies).
Never seen one, but I suspect they weren't common after, say, 1975.
-ethan