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