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S > SCIENCE FAIR > Microcomputer Trainer


This mini forum is intended to provide a simple means of discussion about the Science Fair Microcomputer Trainer computer. If you want to share your own experience or memories, or add relevant information about this system: post a message! For other purposes like sales messages, hardware & software questions or information requests, please use our main forum.

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Sunday 20th August 2017
Wayne Rowlinson (Canada)

The first year this appeared in any Radio Shack catalog was 1985. It shows "New for ''85" in its description.

Friday 6th May 2016
Chad Castagana

I read that the microprocessor of this ''Science Fair Trainer'' only had 128 words of RAM of 4bits each and that only 16 could be used to store data or user instructions..
This board must have been designed around 1980 for it''s using an electrodynamic speaker instead of a piezoceramic one!

Friday 24th April 2015
Duncan Bayne (Australia)
Duncan Bayne

I''ve put a few videos of my Microcomputer Trainer on Vimeo$ here''s one of me writing and explaining a trivial test program:

Sunday 29th March 2015
uridium (Australia)

It''s got 2k ROM and 64bytes of RAM, of which 48 are user addressable. Create a program and step through it, and you wrap at 49 bytes. It''s got a simulated instruction set. The underlaying chip the TMS1312 is an TMS1100 variant. The printed manual states this.

I still have one living and am writing a simulator. Anyone got a way to dump the PROM?

Friday 5th August 2011

This appears to be very similar in operation to the Gakken 4-bit GMC-4 which I just got the from the Maker Shed. The stored programs are the same.

Wednesday 30th March 2011
Tor Schofield (Denmark)

I have just got one of these off Ebay in excellent condition and it works fine. I gave away my original to a charity shop, so may have got my old one back again?!!

I have 2 questions about it though:

1. why under the binary LED lights does it have the decimal numbers 0 1 2 3 4 5 6 and not the binary 1 2 4 8 16 32 64$ and

2. what do the numbers abover the binary LEDS 1 2 4 8 1 2 4 mean - do they have something to do with the 4 bit processor?

Has anyone reverse engineered a better keyboard for the Trainer?

Monday 26th October 2009
Rob Mitchell (Atlanta, Georgia)

I found a Microcomptuer Trainer at a thrift store .. I''ve had alot of fun exploring its potential! Great little programming tool .. I would have had a blast with it if I had it when I was a kid! Now I tell coworkers that I have a new computer and pull it out! Great conversation piece!

Tuesday 1st February 2005
Alexander Pierson (Virgina, USA)

I recieved a microcomputer trainer from my mother, and i found it very amusing. Sciencefair made a few other similar project kits that alowed you to create different electronic circuts, that were compatable with the MCT, like the 200-in-one, and the 60-in-one. The MCT could be used as an electronic organ, as well as be programed to play tunes. It also could display programed morse code messages, even your own little games. Mine had an LED in the binary display that was not functioning, so i had to jury-rig it.

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