30 Nov
2009
30 Nov
'09
12:30 p.m.
allison wrote:
Like the well-known myth that the HP9100 calculator contaisn no ICs.
Assuming you don't count the hybrid circuits that contain the R's and C's
for the flip-flops, or that wonderful inductively-coupled PCB that forms
the main ROM, there are still 8 conventional IC op-amps in the card
reader of the 9100
-tony
one example is the Apollo AGC used nothing but 3
input RTL nor
gates if memory serves.
Almost every reference claims that it only used the three
input RTL NOR
gate, but they're actually incorrect. It contained two kinds of chips,
the other of which was a core memory sense amplifier.