| ADDRESS | NAME | FUNCTION | |
|---|---|---|---|
| HEX | DECIMAL | ||
| $FF81 | 65409 | CINT | Initialize screen editor |
| $FF84 | 65412 | IOINIT | Initialize input/output |
| $FF87 | 65415 | RAMTAS | Initialize RAM, allocate tape buffer, set screen $0400 |
| $FF8A | 65418 | RESTOR | Restore default I/O vectors |
| $FF8D | 65421 | VECTOR | Read/set vectored I/O |
| $FF90 | 65424 | SETMSG | Control KERNAL messages |
| $FF93 | 65427 | SECOND | Send secondary address after LISTEN |
| $FF96 | 65430 | TKSA | Send secondary address after TALK |
| $FF99 | 65433 | MEMTOP | Read/set the top of memory |
| $FF9C | 65436 | MEMBOT | Read/set the bottom of memory |
| $FF9F | 65439 | SCNKEY | Scan keyboard |
| $FFA2 | 65442 | SETTMO | Set timeout on serial bus |
| $FFA5 | 65445 | ACPTR | Input byte from serial port |
| $FFA8 | 65448 | CIOUT | Output byte to serial port |
| $FFAB | 65451 | UNTLK | Command serial bus to UNTALK |
| $FFAE | 65454 | UNLSN | Command serial bus to UNLISTEN |
| $FFB1 | 65457 | LISTEN | Command devices on the serial bus to LISTEN |
| $FFB4 | 65460 | TALK | Command serial bus device to TALK |
| $FFB7 | 65463 | READST | Read I/O status word |
| $FFBA | 65466 | SETLFS | Set logical, first, and second addresses |
| $FFBD | 65469 | SETNAM | Set file name |
| $FFC0 | 65472 | OPEN | Open a logical file |
| $FFC3 | 65475 | CLOSE | Close a specified logical file |
| $FFC6 | 65478 | CHKIN | Open channel for input |
| $FFC9 | 65481 | CHKOUT | Open channel for output |
| $FFCC | 65484 | CLRCHN | Close input and output channels |
| $FFCF | 65487 | CHRIN | Input character from channel |
| $FFD2 | 65490 | CHROUT | Output character to channel |
| $FFD5 | 65493 | LOAD | Load RAM from a device |
| $FFD8 | 65496 | SAVE | Save RAM to device |
| $FFDB | 65499 | SETTIM | Set real time clock |
| $FFDE | 65502 | RDTIM | Read real time clock |
| $FFE1 | 65505 | STOP | Scan stop key |
| $FFE4 | 65508 | GETIN | Get character from keyboard queue (keyboard buffer) |
| $FFE7 | 65511 | CLALL | Close all channels and files |
| $FFEA | 65514 | UDTIM | Increment real time clock |
| $FFED | 65517 | SCREEN | Return X,Y organization of screen |
| $FFF0 | 65520 | PLOT | Read/set X,Y cursor position |
| $FFF3 | 65523 | IOBASE | Returns base address of I/O devices |