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Cherry M8, MD and MJ examples

Examples of keyboards with M8, MD and MJ switches. These are arranged in approximate order of manufacture based on date and serial number.

For customer part number and system details, see the master vintage Cherry keyboards list.

Switch models listed are purely assumptions. M81 is assumed for triangular prisms, as M81 and M82 cannot be differentiated without an extreme close-up photograph.

Keyboard From Serial Date Switches Variants Spacing System Reference Notes
UB88-0005 Harpenden, UK 1981-11-24 14811 M8 12 mm covered LED ~15 mm Deskthority
U01-0114 Auerbach, DE ca. 1982 2030 M8 6 mm open, M81? LED
Stable
¾″ Basis 108 Deskthority
UB70-0047/A Harpenden, UK 1984-04-13 040664 M8 6 mm open, M81? LED Wren Executive Computer eBay
UB88-0016 Harpenden, UK 1984-06-01 043167 M8 6 mm covered LED ~15 mm? Deskthority
UB88-0008 Harpenden, UK ca. 1984 046608
046612
M8 6 mm covered LED ~15 mm bbs.wstx.com Uses a National Semiconductor COP402N ROM-less microcontroller paired with a National Semiconductor MM2758Q-A 8 kilobit EPROM.
G80-0662/03 Auerbach, DE 1988? 3174 A12 M84A-0100
M84A-01R0
LED ¾″ Deskthority The TTL ICs are dated 1984, the controller is either 1981, 1986 or 1991, and the “A” code implies 1988.