On 2022-05-16 1:50 p.m., Eric Smith via cctalk wrote:
On 2022-May-15, at 3:53 PM, Eric Smith wrote:
I specifically said 74x74. Early TTL flipflops were very crude by
comparison.
On Mon, May 16, 2022 at 11:28 AM Brent Hilpert via cctalk <
cctalk@classiccmp.org> wrote:
pre-TTL != early TTL
No, but 7470, 7472, 7473, and 74948 were _very_ early and were also very
crude, as were their later L and H variants. 7474 was slightly later, and
less crude.
It should also be noted that the 7400 series was NOT the first commerical
TTL integrated circuits. The earlier TTL flip-flops were even more crude,
but I imagine the engineers that used them were nevertheless delighted at
the advance over RTL and DTL.
Did DEC not use a few Non TTL chips to reduce I/O loading on the bufferd
lines?
Ben.
