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tomcircuit

RF, automotive electronics, vacuum tubes, microwave, analog synth, microcontrollers...these are a few of my favorite things.

metro Detroit, MI
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9.3k Followers
26 Following
12 Projects
211 Likes
tomcircuit
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This user joined on 03/07/2014.

20.2k
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Hitachi HD63C09 clocked at a blistering 3 MHz with a capacious 64K of RAM! Retroputing bliss...
Project Owner Contributor

HD6309 Singleboard Computer

tomcircuittomcircuit

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Texas Instruments TMS9918/9118 can be used with convenient 32K SRAM instead of 4K/16K DRAM
Project Owner Contributor

TMS9918 VDP with SRAM video memory

tomcircuittomcircuit

2.3k
798
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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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Safe and convenient power for HP 35/45/55/67 Calculators
Project Owner Contributor

Classic HP Calculator LiPo Battery Pack

tomcircuittomcircuit

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A modern replacement for the TI-58/59 Calculator BP1
Project Owner Contributor

TI-59 LiPo Battery Pack

tomcircuittomcircuit

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I have a working Rb 10 MHz oscillator, so why not give it a nice home?
Project Owner Contributor

10MHz Rubidium Standard

tomcircuittomcircuit

View all 12 projects

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lol travelling salesman problem
Project Owner Contributor

Travelling Hacker Box

benchoffBenchoff

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I am building a computer featuring a 16-bit RISC CPU made of discrete transistors for learning, fun and art. It will be pretty large.
Project Owner Contributor

The Spikeputor

spudfishscottspudfishScott

750
786
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An Apple ][ I/O card to control up to four SPI peripherals without the need for bit banging.
Project Owner Contributor

SPI Controller Card for the Apple ][

spudfishscottspudfishScott

Things I've Built

SeeMeCNC Huxley H-1 3D Printer

I bought this as a kit and assembled it with some help from my sons. What a blast! Heated bed upgrade, and working on an improved carriage. Polishing my rudimentary mechanical design skills and learning 1-2-3D...

Fairchild 7000A Nixie DMM true RMS upgrade

I regularly use this nice Nixie multimeter, but the original AC volts measurement was lacking (peak * 0.707). I made a completely new AC measurement card based on an Analog Devices AD636 True RMS converter. Now it's better than new!

HD63B03 Singleboard Computer

I found some cheap HD6303 (MC6801 compatible) MCU and thought it'd be fun to go back to the ancestor of the 6809, 68HC11, 6502... It was fun for a while but, gosh, what a lot of slogging to get anything done with a single index register!

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An easy to build homebrew SBC with a 68008 CPU. Two HW options: Lite and Full. Lite allows to build a 3 ICs 68008 system running CP/M-68K.
Project Owner Contributor

68k-MBC: a 3 ICs 68008 homebrew computer

just4funJust4Fun

10.6k
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I am making a full sized Sol-20 reproduction, the first fully assembled microcomputer with a built-in keyboard and television output.
Project Owner Contributor

Sol-20 Reproduction

michael-gardiMichael Gardi

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A series of m68k-based single-board computers built to run Linux
Project Owner Contributor

Mackerel-68k Linux SBCs

colin-mColin M

7.5k
45
3
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An active scope probe with high-ish bandwidth and very low input capacitance
Project Owner Contributor

DIY 1.3 GHz FET Probe

christophChristoph

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243
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This is my project page for my new home brew computer, a multi-processor 63c09 and AVR SBC.
Project Owner Contributor

HB63C09M - 10x10 HD63C09 Based SBC

dave-collinsDave Collins

2.5k
32
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An open-source minimalist 68030 based VMEbus computer
Project Owner Contributor

hexahedron

jason-westerveltJason Westervelt

1.8k
8
4
8
V9938 and V9958 Video display processors were successors to TMS99X8 - this is an attempt to convert their video signal to VGA using FPGA
Project Owner Contributor

MSX2(+) video to VGA conversion (proof of concept)

zpekiczpekic

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10
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Featuring USB-C!
Project Owner Contributor

HP Woodstock LiPo Battery Pack

cyulCYUL

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10
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256 switches and few shift registers to implement a working 16 or 32-bit integer arithmetic calculator (+, -, *, /, isqrt, BCD / bin conv..)
Project Owner Contributor

Bit-serial CPU based on crossbar switch

zpekiczpekic

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Getting a hand-written Assembly Forth running on the 32-bit Longan Nano
Project Owner Contributor

Forth powered RISC-V microcontroller

alexander-williamsAlexander Williams

991
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Small CPU in VHDL
Project Owner Contributor

Small CPU in VHDL

land-boardscomland-boards.com

939
13
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An E-paper digital clock that updates the time seamlessly, while using very little power
Project Owner Contributor

E-paper Clock with power loss recovery

jamiekJamieK

878
8
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Retro Style 1-Bit Trainer Board based on MC14500
Project Owner Contributor

PLC14500

nicola-cimminoNicola Cimmino

852
8
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An extension to the TI59 Lipo project for old TI calculators requiring a boost to 9V from a lipo 3.7V.
Project Owner Contributor

TI LiPo 9V battery pack for Vintage TI calculators

nico-verduinNico Verduin

839
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Stuart Conner's Simple TMS9995 board build
Project Owner Contributor

Stuart Conner's Simple TMS9995 board build

keithKeith

750
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An 68B09 SBC with 16KB ROM and 32KB RAM, 8 bits I/O and 2 serial ports @ 115200 baud.
Project Owner Contributor

Scrumpel8 an 6809 SBC

nick-brokNick Brok

587
8
2
9
An embedded Forth computer for rapid project development.
Project Owner Contributor

Scamp

johncatsoulisjohncatsoulis

387
7
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A usable fix for a broken battery door on an HP28S Calculator
Project Owner Contributor

HP28S Battery Door Prosthetic

bharbourBharbour

View all

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Michael Gardi wrote 09/16/2021 at 02:56 • point

Thank you for your interest in my Sol-20 Reproduction project Tom.

  Are you sure? yes | no

roelh wrote 12/06/2019 at 17:48 • point

Hi Tom, thanks for liking the #4 bit TTL ALU !

  Are you sure? yes | no

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