| C64 ROM | Routines |
| Prev: FF5B | Up: Map | Next: FF80 |
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Used by the routine at FDA3.
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| FF6E | A9 81 | LDA #$81 | enable timer A interrupt | |
| FF70 | 8D 0D DC | STA $DC0D | save VIA 1 ICR | |
| FF73 | AD 0E DC | LDA $DC0E | read VIA 1 CRA | |
| FF76 | 29 80 | AND #%10000000 | mask x000 0000, TOD clock | |
| FF78 | 09 11 | ORA #%00010001 | mask xxx1 xxx1, load timer A, start timer A | |
| FF7A | 8D 0E DC | STA $DC0E | save VIA 1 CRA | |
| FF7D | 4C 8E EE | JMP $EE8E | set the serial clock out low and return | |
| Prev: FF5B | Up: Map | Next: FF80 |