Now it is born. Single Board Z80 computer

A project log for Retro DIY computer project

Previously I made 4-bit CPU, and I would like to follow the progress of human being.

kodera2tkodera2t 09/21/2016 at 04:470 Comments

Now it is born, the single board Z80 computer. The schematic is exactly the same as my previous one, just using PCB service. It has 32kB SRAM on-board (below EP-ROM).

The main chip is wonderful TMPZ84C015, it is highly composite CPU including two PIO, two SIO, and CTC. The board size is small but it includes,

(1) Z80 CPU

(2) Z80-CTC

(3) two Z80-PIO

(4) two Z80-SIO

(5) Z80-CGC

, and watchdog time just in one chip!!

In my previous board, none of these pins are wired but this board all of functions are accessible. As same as another project, I will send this board as semi-kit at I've purchased around 10 MCUs but I need several preparations (EP-ROM writing, LPC810 firmware writing) and hopefully in a few weeks, it will be on sale. Actual operation can be found in the following movie... Stay tune!