After bench testing, I had to write an 8008 driver and hook up the keyboard interface to a real SCELBI to complete checkout. The standard I/O ports for the keyboard are port 4 for input and port 16 for output. For testing purposes, here is how the setup was hooked up.

Keyboard Interface Checkout

Here is the driver.

167 ; HERE IS THE USER DEFINED CHARACTER INPUT TO READ FROM KEYBOARD INTERFACE
168 ;
169 ; returns character in A
170 INPUT:
171 44-256 111 INP KEYIN ; read keyboard
172 44-257 240 NDA ; is a new character present
173 44-260 120 256 044 JFS INPUT
174 44-263 125 OUT KEYOUT ; ack character read
175 44-264 044 177 NDI 177 ; clear MSB
176 44-266 007 RET ; return character in A with MSB clear


In order to test, I simply changed the input driver on my modified creed monitor (MCMON), moved it to SRAM address 010-000 and downloaded using the MCMON monitor that is in EPROM on my SCELBI 8H. Then I jumped to the downloaded monitor to see if it would take input from my PS/2 keyboard adapter instead of the serial port. It all worked exactly as expected. I just need to put it into an enclosure and I can consider the hardware for this board done.

The software will probably take some more work, as I will have to integrate this keyboard driver with the oscilloscope driver for MEA, once I get the oscilloscope cards built. Speaking of the oscilloscope cards, I think I should be ordering the PCBs within a week or two. That interface will take considerably more software in order to get it working.