Nascom 2 keyboard connector

Yes. I have the Nascom 2 manual in front of me. From waht I can see, the keybaord came as an assembled unit, and there's no schematic in the manual for that. But the pinouts of the connector are there, here you are : PL3 (Keyboard) 1 D0 (this is an input to a tri-state buffer, then onto the Z80 data bus) 2 +5V 3 D1 4 NMISw/ 5 D2 6 Q5 (this is an output from a latch chip) 7 D3 8 Q2 9 D4 10 ResetSw/ 11 D5 12 Q0 13 D6 14 Q1 15 D7 16 Gnd There is no description of the keyboard interface in the manual, and I don't feel like battling through the monitor source lising to work out how it works. Maybe the Q lines are decoded and used to scan the key matrix in software or something. Alas not. You could use a 24 pin Blue Ribbon connector, or a DB25, or... For refernece, the other connector pinouts are : PL2 (Serial)_ 1 Drive (This is a tranistor buffer output to drive a cassette-control relay) 2 +5V 3 RS232 In 4 Ext Tx Clk 5 Ext Rx Clk 6 RS232 Out 7 -12V 8 Spare 9 20mA Loop In 10 +12V 11 Gnd 12 20mA Loop Out 13 Cass Out Hi 14 Cass Out Lo 15 Gnd 16 Cass In (Whatever you do, don't connect the keyboard to PL2. You will do damge due to the 12V lines here. Also, there are various links you must set to select baud rate, selkect between cassette and RS232 operation, etc) PL4 (User port). This is basically the 'port' side of a Z80-PIO 1 B5 2 B4 3 B6 4 B3 5 B7 6 B2 7 ARdy 8 B1 9 BStb/ 10 B0 11 AStb/ 12 BRdy 13 A0 14 N/C 15 A1 16 Gnd 17 A2 18 Gnd 19 A3 20 +5V 21 A4 22 +5V 23 A5 24 A7 35 A6 26 N/C Hope that helps -tony