
Specifications:
CPU: Intel 8021/TI TMS1100 (on cartridge) @ 100KHz (yes, KHz, not MHz)
Display: 16 x 16 (yeah, really)
Sound: Piezo beeper
Memory: RAM: 32 nybbles (16 8-bit bytes, integrated into CPU). ROM: 2K.
Software Media: Cartridge ROM: 2K masked (integrated into CPU; each game's CPU was different)
Value: £5+
Very old, but not in particularly high demand.