Registers in the Peripheral Interface Adapters ( 8520's (CIA's) )
8520-A | 8520-B | NAME | EXPLANATION |
BFE001 | BFD000 | PRA | Peripheral data register A |
BFE101 | BFD100 | PRB | Peripheral data register B |
BFE201 | BFD200 | DDRA | Data direction register A |
BFE301 | BFD300 | DDRB | Data direction register B |
BFE401 | BFD400 | TALO | TIMER A low register |
BFE501 | BFD500 | TAHI | TIMER A high register |
BFE601 | BFD600 | TBLO | TIMER B low register |
BFE701 | BFD700 | TBHI | TIMER B high register |
BFE801 | BFD800 | Event LSB | |
BFE901 | BFD900 | Event 8-15 | |
BFEA01 | BFDA00 | Event MSB | |
BFEB01 | BFDB00 | No Connect | |
BFEC01 | BFDC00 | SDR | Serial Data Register |
BFED01 | BFDD00 | ICR | Interrupt Control Register |
BFEE01 | BFDE00 | CRA | Control Register A |
BFEF01 | BFDF00 | CRB | Control Register B |