z80type tests the Z80 CPU type. Currently it is able to distinguish between NMOS CPUs, CMOS CPUs, and U880 CPUs.

z80type runs under the CP/M or ZSDOS OSes. It uses SIO interrupt vector register as a scratch register for tests. By default the code is configured to run on RC2014* SIO module or on Small Computer Central RCBus modules, such as SC725 – RCBus Serial and Timer Module. If running on different systems, modify the SIOBC constant in the code to point to the SIO Channel B control register, and rebuild the code.

The code is written using CP/M ASM syntax and can be compiled as follows:

A>ASM Z80TYPE
A>LOAD Z80TYPE

This is the output for most Z80 NMOS processors, including:

• Zilog Z-80A CPU, date code 7935
• Zilog Z8400APS, date code 8635
• Zilog Z0840006PSC, date code 0415
• SGS Z8400AB1, date code Y28427
• Mostek MK3880N, date code 8448
• NEC D780C, date code 8401XD
• GS Z8400A PS, date code 8640
• ST Z8400AB1, date code 28923
• Sharp LH0080A, date code 048CB
• GoldStar Z8400B PS, date code 9006
• KR1858VM1, date codes 9305 and 9306

E>z80type
Z80 Processor Type Detection (C) 2024 Sergey Kiselev
Processor family: Z80
Logic family:     NMOS
Manufacturer:     Zilog or non-MME/Thesys clone

This is the output for East German UB880 Z80 clones:

• MME UB880D U 6
• MME UB880D T 3
• Thesys Z80H

E>z80type
Z80 Processor Type Detection (C) 2024 Sergey Kiselev
Processor family: U880
Logic family:     NMOS
Manufacturer:     MME or Thesys

This is the output for Zilog Z84C00 and reportedly ST Z84C00 (to be verified)

E>z80type
Z80 Processor Type Detection (C) 2024 Sergey Kiselev
Processor family: Z80
Logic family:     CMOS
Manufacturer:     Zilog or SGS/ST

This is the output for NEC and Toshiba Z80 CMOS clones:

• NEC D70008AC-6, date code 8832LX703
• Toshiba TMPZ84C00AP-8, date code 9544EFI

E>z80type
Z80 Processor Type Detection (C) 2024 Sergey Kiselev
Processor family: Z80
Logic family:     CMOS
Manufacturer:     Toshiba or NEC