| C64 ROM | Routines |
| Prev: F32F | Up: Map | Next: F34A |
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| F333 | A2 03 | LDX #$03 | set the screen device | |
| F335 | E4 9A | CPX $9A | compare the screen with the output device number | |
| F337 | B0 03 | BCS $F33C | if <= screen skip the serial bus unlisten | |
| F339 | 20 FE ED | JSR $EDFE | else command the serial bus to UNLISTEN | |
| F33C | E4 99 | CPX $99 | compare the screen with the input device number | |
| F33E | B0 03 | BCS $F343 | if <= screen skip the serial bus untalk | |
| F340 | 20 EF ED | JSR $EDEF | else command the serial bus to UNTALK | |
| F343 | 86 9A | STX $9A | save the screen as the output device number | |
| F345 | A9 00 | LDA #$00 | set the keyboard as the input device | |
| F347 | 85 99 | STA $99 | save the input device number | |
| F349 | 60 | RTS | ||
| Prev: F32F | Up: Map | Next: F34A |