3 (or 4 or 5)-chips Z80 SBC

01/24/2017 Posted by admin

I have started working on a Z80 board that would use only 3 parts (Z80, RAM, Glue logic+SIO).

The Glue is done via a PSoC4 from a Cypress CY8CKIT-049-42xx (<5 euros…) – Currently the Flash chip is not used, and only 64KB from the RAM (128K) is used. Z80 is clocked at 9.6Mhz.

There is provision for RAM & ROM bank switching in the future (or not… maybe it would be better to replace the flash by an sdcard)

It has started working… If you count the serial-to-usb chip on the CY8CKIT, that’s a 4 chips Z80 board – if you count the CY8CKIT as one chip, it is a 3 chips board…


With Z80′s reset line low, via a bootloader, Grant Searle’s Basic is sent from the PSoC4 memory to the RAM and the Z80′s reset is set to high.

One Response to 3 (or 4 or 5)-chips Z80 SBC

  1. Drake says:

    This is so awesome.

Laisser un commentaire

Votre adresse de messagerie ne sera pas publiée. Les champs obligatoires sont indiqués avec *


9 + = quatorze

Vous pouvez utiliser ces balises et attributs HTML : <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>