UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Zen Z80 editor-assembler for the Grant Searle & RC2014mini/micro/classic

ortek_service · 20th Mar 2023, 7:57 am

Yes, and the Z80-SIO is probably much-rarer than the CPU - as not many Z80 systems had a Z80-SIO IC fitted as standard (sometimes opting for an 8251 etc, if only Asynchronous-serial was required - like in the Tatung Einstein - Maybe it was a bit cheaper?)

And SGS-ATES Z80 family IC's probably aren't that common (compared with more-usually encountered Zilog, NEC and Mostek MK3880 etc ones - especially in a capped-die white-ceramic package.
It seems there are CPU-Collectors, who will pay £100 for a white-ceramic (Rockwell at least?) 6502 CPU. But not sure if they also like to collect the associated peripheral IC's (especially as less-common).

The Z80-SIO may still be being made, but might now be only in higher-seed CMOS version, like the CPU is available in.

20th Mar 2023, 7:57 am	#20
ortek_service Octode Join Date: May 2018 Location: Northampton, Northamptonshire, UK. Posts: 1,440	Re: Zen Z80 editor-assembler for the Grant Searle & RC2014mini/micro/classic Yes, and the Z80-SIO is probably much-rarer than the CPU - as not many Z80 systems had a Z80-SIO IC fitted as standard (sometimes opting for an 8251 etc, if only Asynchronous-serial was required - like in the Tatung Einstein - Maybe it was a bit cheaper?) And SGS-ATES Z80 family IC's probably aren't that common (compared with more-usually encountered Zilog, NEC and Mostek MK3880 etc ones - especially in a capped-die white-ceramic package. It seems there are CPU-Collectors, who will pay £100 for a white-ceramic (Rockwell at least?) 6502 CPU. But not sure if they also like to collect the associated peripheral IC's (especially as less-common). The Z80-SIO may still be being made, but might now be only in higher-seed CMOS version, like the CPU is available in.