The Tangerine Microtan 65 (sometimes abbreviated M65) was a 6502-based single board microcomputer, first sold in 1979, that could be expanded into what was, for its day, a comprehensive and powerful system.

The Microtan 65 was intended as a general purpose microcomputer which could be used by laboratories, original equipment manufacturers (OEMs), and computer enthusiasts, and it was designed with expandability in mind.

This was edited by Tangerine employee Paul Kaufman who continued as editor when the magazine was renamed Oric Owner.

The Microtan 65 was quite simple by today's standards, with: Although the board + keypad could be used stand-alone, only 423 bytes were available for user program/data/stack and there was no facility for storing/loading programs.

The major advance that the Microtan 65 had over a lot of the competition at that time was that the video display was flicker free.

XBUG provided features such as cassette tape loading and saving, a simple assembler / disassembler, hex calculator.

TANEX was also available with the board fully populated with chips (although excluding XBUG, ROMs & BASIC) and in this form the costs were £103.16 for the kit and £114.66 ready assembled.

The Microtan 65 was designed as a modular system able to be expanded as required, and for this each board included an 80-pin connector at one end allowing it to be plugged into a backplane-type motherboard.

In addition to the BASIC programming language Tangerine also released on disk TANFORTH, an extended version of FIG FORTH featuring a full FORTH compiler and editor.