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This computer is what is the ZX-80 to the ZX-Spectrum, but for the Oric 1. Tangerine developped this computer before they became Oric and produced the Oric-1.
It was mainly sold in kit, without the complete keyboard shown in the photo, but with a little hexadecimal keyboard.

The unextended Microtan 65 couldn't use Basic (Basic65) due to its RAM limitation (1kb), so only machine-code was usable.

Te 1kb ROM contained TANBUG, a monitor which allowed to enter machine code programs. But with the unextended Microtan65, there was no way to save your work (not tape facility), so you had to re-type your program each time you switched-on the computer !



Mine travelled up to Applecross in 1984 when I was working at Kishorn in the Oil industry. I think it probably taught me what I needed to get that job! One highlight was writing a "word processor" for a Wang in 1983, learnt from the Microtan, that the whole department used as no one had seen a word processor before!

Tuesday 12th August 2014
Michael (Cumbria England)

The computer on which I really learned hardware and software design, after starting out a year earlier with the MK14.

The basic card and the expansion card (Tanex) were available with a tiny backplane of just two slots and sold as a Micron, but I built up a 19" rack - all the cards were eurocard with DIN41614 connectors carrying all the signals needed to do anything... I remember high-resolution (at the time) full-colour graphics cards that I designed.

Tanex allowed a Microsoft Basic, but I also recall several other languages including one or two assemblers and Forth - figForth 65 from memory.

I was working as an engineer for BBC News at the time, and programmed the countdown display used on the first space shuttle launch on a Microtan. I also cheerfully ripped off the design for any number of useful little projects$ an easy way to synchronise the video output over an incoming broadcast video signal had all sorts of uses in a broadcast studio. Some of the equipment I designed around this card (or around my versions of it) ran critical tasks for over fifteen years.

Friday 13rd July 2012
Neil Barnes (UK)
Nailed Barnacle

I have a Tangerine computer in the loft . . we used to use them at work for all sorts because of their I/O capabilities. A Doctor wrote a Word Processor called Azimov for it. Mine has a long, thin orange (tangerine?) case with an almost square front panel with the connectors on ot. The PCB arrangement is that there are two in ''double decker'' formation. I think it may have been a Micron. The boards didn''t plug into a proper bus, and having later worked for a company which made S100 boards the Tangerine ones were not big enough. They could have used S100 interconnections between PCBs I suppose but they don''t look like S100 format bords to me. Still got the manuals too, plus my son had an Oric. I wonder if he''s still got it?

Friday 4th May 2012
Rex Hanson (UK)


TYPE  Home Computer
ORIGIN  United Kingdom
YEAR  1979
BUILT IN LANGUAGE  Machine-code (through TANBUG)
KEYBOARD  Hewadecimal keyboard in basic version
CPU  6502
SPEED  0.75 MHz
RAM  1 kb (up to 48k)
ROM  1 kb (TANBUG v1), upgradable to 14kb
TEXT MODES  32 x 16
GRAPHIC MODES  64 x 64 with graphic characters
COLORS  Monochrome
I/O PORTS  Bus, Tape, Monitor
PRICE  From $82 (single board version)



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