== Technical ==
PCB has a 50-way edge connector. There is no through connector. The mouse connects via a 9-pin female D-sub (standard joystick socket) which is on the PCB.
The board is labelled "(C) KEMPSTON MICRO AMSTRAD MOUSE I/F" and "ISS B".
The ICs are labelled and are:
IC1 DM74LS00N QUAD 2-INPUT NAND
IC2 DM74LS191N SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL (4-bit binary counter)
IC3 DM74LS191N SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL (4-bit binary counter)
IC4 74LS125APC QUAD 3-STATE BUFFER
IC5 DM74LS191N SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL (4-bit binary counter)
IC6 DM74LS191N SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL (4-bit binary counter)
IC7 DM74LS138N 1-OF-8 DECODER/DEMULTIPLEXER
IC8 DM74LS257BN 3-STATE QUAD 2-DATA SELECTORS/MULTIPLEXERS
IC9 DM74LS257BN 3-STATE QUAD 2-DATA SELECTORS/MULTIPLEXERS
The mouse that comes with the interface has 2 buttons.
Port decoding to be confirmed.
Number of mouse buttons supported to be confirmed.
Position:
bit 1: Right Button (active low)
bit 2..7: unknown
== Review (German) ==