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Keith

Electronic Engineering Consultant

Cambridge, UK
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36 Followers
13 Following
151 Projects
436 Likes
keith
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This user joined on 12/31/2017.

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An FPGA binds the CPU, ROM, RAM and video DACs to form a practical computer.
Project Owner Contributor

FPGA computer in VHDL

keithKeith

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Raspberry Pi to OLED Interfacing
Project Owner Contributor

OLED interfacing

keithKeith

715
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Professional hardware designed by me
Project Owner Contributor

80C188 processor board

keithKeith

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PC104 eight-channel serial board
Project Owner Contributor

PC104 eight-channel serial board

keithKeith

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PIC assembly code for hi-fi front panel
Project Owner Contributor

HiFi Front Panel Firmware

keithKeith

1.6k
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65C02, 32K Flash ROM, 64K fast RAM, USB link to PC. Runs BBC BASIC, at up to 14MHz.
Project Owner Contributor

STEbus 65C02

keithKeith

View all 151 projects

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Some product manuals for STE bus cards from DSP Design
Project Owner Contributor

STEbus Cards by DSP Design

richard-marshRichard Marsh

STEbus projects

STEbus projects

Curated by Keith

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VMEbus projects

VMEbus projects

Curated by Keith

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PC104 projects

PC104 projects

Curated by Keith

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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 skip over 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 65C02 design running BBC BASIC at 8MHz, and a Z180 board.

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 http://www.acornatom.nl/sites/fpga/acorn_atom_project.htm

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inductively-coupled radiofrequency plasma toroid in xenon gas
Project Owner Contributor

Plasma Toroid (sky-guided PCB edition)

sky-guidedsky-guided

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Smartwatch wearable, ultra-long life measured in years, no need to recharge.
Project Owner Contributor

Smartwatch 10 Years Ultra-Long Battery Life

valentineVALENTINE

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This is a 1/60 scale model of the Saturn V and Launcher - Umbilical Tower. This model is huge! I have been working on it for two years.
Project Owner Contributor

Apollo Saturn V and LUT

wglasfordwglasford

3.2k
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Easy-to-build 68020 single-board computer - utilizing conventional components only and designed for simplicity and ease of understanding
Project Owner Contributor

68020 minimal homebrew computer

stevenSteven

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27
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Producing a Functional Clone of the Apple Lisa 2/5, using NOS components.
Project Owner Contributor

A Brand New Apple Lisa

dosfoxDosFox

2.6k
19
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A HomeBrew Intel 80286 computer with ISA ports
Project Owner Contributor

Intel 80286 HomeBrew Computer

dominic-emond-belangerDominic Emond-Belanger

2.1k
634
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A modern MCU-based hardware replacement for the venerable TMC1501 used in the Texas Instruments TI-57 LED calculator.
Project Owner Contributor

TI-57 Programmable Calculator Hardware Retrofit

tomcircuittomcircuit

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There are a lot of information about Tesla coils, but still it's tricky to build/tune one. Here we would like to go over and explain ...
Project Owner Contributor

Tesla Coil - Scientific way

100dollarhacker100dollarhacker

1.3k
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My take on a highly integrated, Motorola 68000 based "single" board computer.
Project Owner Contributor

COMET68k

tomTom

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My adventures with an Intel SDK-85
Project Owner Contributor

Intel SDK-85 Enhancements

jimshortzjimshortz

395
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Making an obsolete board with no documents usable again
Project Owner Contributor

Reverse Engineering an old VMEBus CPU Board

bharbourBharbour

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About as basic as a card can get
Project Owner Contributor

Simple-68008 CPU Card

land-boardscomland-boards.com

338
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Basically an Arduino Uno/Nano combined with a boost converter, high voltage serial shift registers, and I2C RTC to experiment with VFD tubes
Project Owner Contributor

VFD Experimenter

sjm4306sjm4306

154
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As I collected parts for my Interak Computer project, I gained a few Kemitron Computer cards. But what is a Kemitron - could I build one?
Project Owner Contributor

Kemitron Computer

willWill

130
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An Arduino-based lightsaber with sound effects and an accelerometer
Project Owner Contributor

Lightsaber prop with sound effects

matthias-nigmannMatthias Nigmann

106
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2
Some product manuals for STE bus cards from DSP Design
Project Owner Contributor

STEbus Cards by DSP Design

richard-marshRichard Marsh

99
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My efforts to restore an original Interak computer
Project Owner Contributor

Interak Computer Restoration

willWill

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Keeping STEbus boards working
Project Owner Contributor

STEbus Cards by GMT Electronic Systems

richard-marshRichard Marsh

View all

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Bits

VALENTINE wrote 11/23/2023 at 17:55 • point

Thank you. Cheers! Valentine

  Are you sure? yes | no

Mark Wilson wrote 09/11/2022 at 19:21 • point

Thanks for liking LittleZone and ElitePetite!

  Are you sure? yes | no

Keith wrote 09/11/2022 at 19:55 • point

A friend of mine ported Elite onto the Raspberry Pi - in just two weeks!
Mind you, he did develop the R-Pi operating system. A very clever guy!

  Are you sure? yes | no

Mark Wilson wrote 09/11/2022 at 20:37 • point

My non-port took WAY longer than that!

  Are you sure? yes | no

Louis H wrote 12/17/2021 at 21:33 • point

Thanks for liking #MINITEL + ESP32 project 🙂

  Are you sure? yes | no

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?

  Are you sure? yes | no

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...

  Are you sure? yes | no

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

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

  Are you sure? yes | no

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