Category Archives: Hardware

SC132 SIO/0 Released

SC132 is a two channel asynchronous serial port module designed for the RC2014 bus.

This module is based on the Z80 SIO/0 chip which is currently more readily available than the usual SIO/2 chip. It is software compatible with the SIO/2 and thus with existing software.

Details here.

Pocket RomWBW System

Today, I finally received the batch of PCBs I’ve been waiting for from China since January 14.

These boards are for my prototype pocket RomWBW system.

Front view.jpg
SC131 RomWBW CP/M Computer

I’ve got a few tweaks and some testing to do and then I intend to offer it as a kit. I plan to offer a choice of case colours and a choice of front and back panel colours.

SC131 circuit board


  • Z180 CPU running at 18.432MHz
  • 512k Flash
  • 512k RAM
  • 2 serial ports
  • MicroSD card slot
  • No further expansion if possible
Next to SC126 for scale
The case is available in several colours
Viewed with top of case removed
View of back panel
Top view next to SC126 (for scale)

Design – part 1

Someone recently asked me a few questions about design, which got me thinking about writing a series of posts for this website.

I hope to encourage anyone who has considered designing their own retro computer add-on, or indeed a whole system, to have a go. Getting that first professional looking PCB in the post is very rewarding and is relatively cheap.

Continue reading Design – part 1