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Z80 computer - wirewrap hybrid [message #4979]

Sat, 04 August 2018 02:47

linker3000
Messages: 16
Registered: May 2018

Junior Member

Hi everyone, I've just finished my Z80 build - it's based on Grant Searle's design but with most of the glue logic replaced with a GAL. I've used perfboard and standard IC sockets with header pins instead of wirewrap sockets, so it's a bit of a hybrid.

More pics here: https://imgur.com/a/rGRR2NM

This is going to be a chip testing and a show-and-tell board used for STEM classes, so the build reduces handling and risk of snags/wire pulls if it can stay put and everyone can see the components and wirewrapping at the same time. Additionally, wirewrap IC sockets are becoming expensive in small quantities + I have a large stock of regular IC sockets and header pins!!

The only component purchased specifically for this build was the EPROM - and that was only because I has having problems programming a couple from my old stock (then I found out my programmer was faulty).

Chips: Z80 CPU (Mostek MK3880N-4 second-source, date stamped 1980) + 27C128 EPROM + 628128 SRAM + Z80 SIO/0 UART + 74HCT00 + GAL20V8B

Schematic and GAL programming details here: https://github.com/linker3000/Z80-Board

This board just runs MS Z80 ROM BASIC right now; the next step is to add the compact flash/IDE card for CP/M and program storage and that will be it for this board.

Board #2 will have a Eurocard (ECB) interface and banked ROM for expansion + be built on a PCB.

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[Message index]

		Z80 computer - wirewrap hybrid By: linker3000 on Sat, 04 August 2018 02:47
		Re: Z80 computer - wirewrap hybrid By: just4fun on Sat, 04 August 2018 11:34
		Re: Z80 computer - wirewrap hybrid By: linker3000 on Sat, 04 August 2018 12:07
		Re: Z80 computer - wirewrap hybrid By: etchedpixels on Sat, 04 August 2018 14:26
		Re: Z80 computer - wirewrap hybrid By: just4fun on Sun, 05 August 2018 11:52
		Re: Z80 computer - wirewrap hybrid By: plasmo on Sun, 05 August 2018 15:43
		Re: Z80 computer - wirewrap hybrid By: linker3000 on Mon, 06 August 2018 04:15
		Re: Z80 computer - wirewrap hybrid By: linker3000 on Mon, 06 August 2018 13:38
		Re: Z80 computer - wirewrap hybrid By: just4fun on Tue, 07 August 2018 09:40

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