18 Jan
1999
18 Jan
'99
5:44 p.m.
At 09:07 PM 1/18/99 +0000, Tony wrote:
Yes, as well as National's (5203), as well as families like Intel's 1101,
4004, 4040, 8008, etc.
My guess back then = around 1974, was NMOS was not used (much) yet, so MOS
only meant pMOS.
Another giveaway would be the negative Vdd. It puzzled me for a bit that
some pMOS
chips had no ground (0 Volt) pin, a 1101, for example, ran off a 14 Volt
supply with the positive tied to 5 Volts so the pMOS outputs could drive TTL.
Am sure there were very many others such as the AY-5-1013 UART and 2513
(in)famous character generator...
One of Intel's last pMOS products was the 1103 1K ram. I seem to remember it
was marketed as a replacement RAM for various mini's. This is _only_ 25
years ago, does anyone have a system RAM board running with these?
(Connecting the thread for 100 year old systems.)
-Dave
Hmm.
You're comparing CMOS with TTL. The traditional EPROMs are not TTL
but NMOS - very similar components (at the transistor level) to CMOS, but
Were some of the early EPROMS PMOS? The 1702 might have been (the supply
voltages look like PMOS supply rails), but it's not stated in either the
Intel or NatSemi data sheets.