Electronic Engineer for hire.

Cambridge, UK
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This user joined on 12/31/2017.

Things I've Built

ZX80 with 40-column text

I wanted square pixels, which meant raising the clock speed from 6.5 to 7.375 MHz. Which added enough room for 40-column text. So I did it.

Integrated Amplifier front panel

Runs the user interface for a power amplifier and essentially an analogue multiplexer with volume control chips. It can the internal application code and become the front panel for other products!

STEbus boards

Current hobby project is getting various processor boards running on the STEbus. Mostly from a company I worked for 1986-1990, but I'm also designing a new board with the 65C02 running BBC BASIC at 8MHz.

80C32 board

Interfaces CANbus to a valve controller block. The customer expected a tiny bit of test code, but I had cheekily designed it to support BASIC. :-)

80C188 board

Interfaces servo controller commands (on RS485) with a fieldbus protocol card. It worked great!

Acorn Atom in FPGA

I taught myself VHDL with the Xilinx Web pack in 2001. Started off blinking an LED, and ended up here. See

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Craig wrote 06/30/2020 at 00:42 point

Thanks for liking/following my #Magnetic Bubble Memory Makes a Comeback project.  I think it would be easy enough to make a patch board or make a Z80 CPU card for the SBC-85 system so it could use bubble memory too.  Why let the 8085 have all the fun?

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Keith wrote 06/30/2020 at 01:04 point

I thought of interfacing it to the STEbus, then any of my CPU boards can talk to it. However I wonder if there are many bubble memory components left in the world to make it worth while. I saw one module on eBay for £132. Too pricey for me to play with...

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danjovic wrote 08/02/2019 at 20:52 point

Thanks for liking Hippo-B-Gone! btw all your projects are very cool!!

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