goldfarb.ucf-cs@rand-relay.arpa (04/13/83)
Could someone please post some basic information about the National Semiconductor CMOS Z80 look-alike. I'm interested in the extent of compatibility with the Intel 8085 as well as the extent of instruction set compatibility with the Z80. Thanks. Ben Goldfarb ARPA: goldfarb.ucf-cs@Rand-Relay uucp: duke!ucf-cs!goldfarb
pgf (04/19/83)
The NS Z80 look-alike is the NSC800 - It is essentially a Z80 in 8085 clothing. The differences which come immediately to mind (there are probably more) are: 1) 8085 has no refresh control, the NSC800 does on pin 28. 2) the Z80 instruction set has no means of controlling the serial lines or the maskable interrupts on the 8085 hardware (no RIM and SIM instructions), so an internal IO port is used. 3) the NSC800 has a power-save pin. paul fox ...!houxm!pgf