Specification:

128 test pins.
Connector pins 2 64 way via standard IDC header.
Continuity Less than 2.9K ohm.
Keyboard 4 x 4 keyboard; 0 to 9, 4 cursor keys, clear & enter
Display 1 line 16 character alphanumeric LCD, backlit display
Processor Z80 CMOS
Memory 32K EPROM, 32K RAM 57 cable memory store
RS232 Printer/ PC link
Power Integral 9V NiMH battery.
External 'Plug Top' power supply.
5 year Lithium (memory backup)
L 180mm W 310mm D 60mm.