Minstrel 3 with Keyboard - Z80 based ZX81 kit from Tynemouth
Minstrel 3 with Keyboard - Z80 based ZX81 kit from Tynemouth,ZX81+38 a clone of the ZX-81 - RevSpace,The ZX81 finally gets the keyboard it deserves • The Register,ZX81 Input / Output Board - Allan Faulds,ZX81 Mechanical Keyboard for ZX81+38 - Share Project - PCBWay