> Thanks in advance for any leads or on-topic discussion of the keyboard > protocol to tide me over in the meantime...
I'll see what I can find, I am sure I have some notes on it somewhere. >From what I remember, the keyboard interface is 8 bits + a strobe line. Bottom 7 bits are essentially the ASCII code of the key, the MSB is the Ctrl key (which does not affect the bottom 7 bits). The reset button is also on the keyboard case (at the back of it) on a PERQ 1, it just grounds a line on the connector. There's also the DDS (diagnostic display). This is a 3 digit decimal counter + 7 segment displays. Cleared to zero by the reset button, incremented by a signal on the connector. The machine will run without it, but it's very helpful to know what the microcode thinks is wrong when the PERQ won't boot. -tony
