The following people have Web pages referring to the UK101:

• The Alchymist [link broken].
• Stephen Crane [link broken], who's written a 6502 emulator.
• Paul Evans.
• Bob Green [link broken].
• Steve Harvey [link broken].
• Paul Ledbury [link broken].
• Leif W Linde
• Conor O'Neill [link broken].
• Grant Searle, who has a UK101 in his web-museum, as well as circuits for building a UK101-compatible machine.
• Rick Sterry.
• Stephen Taylforth.
• Drew Wagar, who mentions the UK101 on his blog here.
• David Ward.
• Steve Hill.
• alan73.
• Andy, G0POY.
• Martin Ward, who has kindly digitised some of his old UK101 tapes and put the software on the web, here.
• Pete Griffiths has a nice photo of his UK101 along with a few other homebrew 6502 computers.

In addition, take a look at Ian McLaughlin's UK101 Page, which includes an HTML version of the manual and another emulator. Ian has also set up a UK101 mailing list.

The Southdown Amateur Radio Society was an early user of the UK101 for ham radio [link broken].

Another Web-museum with a UK101 is Steve Smith's Old Computer Archive [link broken]. (UK101 exhibit [link broken])

At Retro Madness, they have a UK101 exhibit with a photo of a slightly modified machine. It looks as though the power supply regulator has been changed, but there's also a small PCB on top of the RF modulator, and the ROM or EPROM for the monitor (IC13) is completely white.

The 6502 processor was designed in about 1975 by MOS Technology, Inc. of Norristown, PA. Commodore bought the company in 1977. The designer of the 6502, Chuck Peddle, went on to design the Commodore PET and the Sirius. The chip was second-sourced by Synertek and Rockwell (Synertek made the mask-programmed ROMs for the UK101 too). Some of the employees of MOS Technology left the company and formed the Western Design Center where they continued to develop the 6502 architecture.

This Chronology of Personal Computers mentions the 6502 first shipping in 1976.

Nowadays, you'll find enthusiastic support for the 6502 at 6502.org, where there is a full set of data sheets as well as a software library. There's also The 6502 Group who meet in Denver every Tuesday. The chip collections at CPU World show what the packaged 6502 chip looks like, as well as showing all the second-source manufacturers. As for a photo of the chip itself, have a look at the Molecular Expressions web page.

Oxford University Computing Laboratory's 6502 Microprocesor Instruction Set Summary (one of a set).

Much of the Compukit UK101 design is identical to the Ohio Scientific Superboard II, and therefore web-sites about the OSI machines are relevant to the UK101. The Director of Product Development at Ohio Scientific, Inc. from 1977 until 1983 was William H. Bordy. He presumably designed the original Superboard II machine.

Prof. Mark Csele maintains a collection of vintage computers, including the Ohio Scientific. That page includes schematics for the OSI Model 600, which are worth comparing with the UK101.

The same processor appeared in many other 8-bit micros:

Development System	KIM-1 (the original 6502 development system)
Development System	Synertek SYM-1
Development System	Rockwell AIM-65
Development System	Acorn System One
Hobbyist System	Ohio Scientific Superboard II
Hobbyist System	Tangerine Microtan 65
Game Console	Nintendo Entertainment System
Game Console	Atari 2600, 5600 and 7800
Business System	Apple ][ and Apple ///
Business System	Commodore PET
Home System	Commodore 64, Plus-4, VIC-20
Home System	BBC Micro and Acorn Electron
Home System	Acorn Atom
Home System	Oric I and Oric Atmos
Home System	Atari 400 and 800

If you're interested in other machines of the time, take a look at The Home Computer Hall of Fame.