PS/2 Keyboard adapter for TRS-80?

Her's the model 4 one, the model 3 is similar but some keys are missing @ H P X 0 8 Enter LShift A I Q Y 1 9 Clear RShift B J R Z 2 : Break Ctrl C K S 3 ; Up Caps D L T 4 , Down F1 E M U 5 - Left F2 F N V 6 . Right F3 G O W 7 / Space The 8 columns are the input to the matrix, driven my open-collector inverters from the system address lines. The 8 rows are the inputs to the 3-state buffer, pulled up by resistors on the CPU board. The keyboard is conencted via a 20 pin header. The pinout is : C1 o o C0 C3 o o C2 C5 o o C4 C7 o o C6 R1 o o R0 R3 o o R2 R5 o o R4 R7 o o R6 Rst NC o o Not used Rst NO o o Rst Com - Ground The rest button is a changeober switch wired with the common to ground and the other 2 pins to NC (normally closed) and NO (Normally open). In fact the normally closed contact is not used on the M4 CPU board I've got. -tony