I/O Map
The table below lists the main I/O definitions for the System 00. The I/O mapping is the same as for FRED I.
EF1 |
Group 1: hex keypad or punch card data ready Group 3: tape data ready |
EF2 |
Tape running/stopped |
EF4 |
Tape error |
OUT 1 |
Set I/O group I/O group 1: hex keypad & punch card I/O group 2: TV I/O group 3: tape |
OUT 2 |
Group 1: 1 = program mode, 2 = direct mode Group 2: display type; 0 = TV off, 1 = 32×32, 2 = 64×16, 3 = 64×32 Group 3: bit 4 = program mode, bit 5 = direct mode, bit 6 = write mode |
OUT 3 |
Group 3: bit 0 = 1 - run tape, bit 1 = 1 - sound on, bit 2 = sound |
INP 0 |
Group 1: read byte from hex keypad or punch card Group 3: read byte from tape |