I/O Map
The following table lists the main I/O definitions of the Cosmac VIP II.
Q
- Q Led
- Cassette out
- Printer: strobe
EF1
CDP 1862 display: display status
EF2
Casssette in
EF3
- Hex keypad A pressed
- Printer: busy
EF4
- Hex keypad B pressed
- Ascii Keyboard pressed
OUT 1
CDP 1862 display: display off
OUT 2
hex key latch
RCA version: Address latch, after any OUT 2 RAM will be mapped at address @0000 instead of ROM
OUT 3
- Tone latch
- Printer: latch
OUT 4
ED version: Address latch, after any OUT 4 RAM will be mapped at address @0000 instead of ROM
OUT 5
Step background Colour
OUT 7
Cassette on/off
INP 1
CDP 1861 display: display on
INP 3
Read keyboard data