20 Oct
1999
20 Oct
'99
5:01 a.m.
allisonp(a)world.std.com wrote:
Hi
Another issue with the 4004 is that it used a lot of
dynamic latches. These would need to be replaced by full
latches if done as a descrete part. The 2300 transistors
of the 4004 would most likely be expanded to about 3000.
Still, if one used 8 bit latch chips, one could make a
reasonable copy. I would think a 4004 equivalant could
be done in one of the larger programmable parts. I did
a clase where we put a 16 bit processor into one of these
larger chips.
Dwight
BTW: I am
building an Intel 4004 or possible an 8008 with flip chip modules.
Will tell you when I start it.
Those parts were in the 3000-6000 transistor bracket. I'd expect an 8008
in flip chips would be bigger than a straight-8 (that's larger than an
8S). Why? The 8008 is register rich compared to the PDP-8 series and
for every bit in a register thats a flip chip (8008 is about 45 bits of
registers alone and then there are the FFs in the state logic). This
thing is going to be HUGE. The 4004 would be less ambitious but there are
still a lot of FFs in that part.
Allison