| Function | Address | Vector | Description |
|---|---|---|---|
| OSRDRM | FFB9 | Read byte from paged ROM | |
| OSEVEN | FFBF | Generate an event | |
| OSRDCH | FFE0 | 210 | Read character from current input stream |
| OSASCI | FFE3 | Write character, call OSNEWL if A=&0D | |
| OSNEWL | FFE7 | Write a newline | |
| OSWRCH | FFEE | 20E | Write character to screen or output stream |
| OSWORD | FFF1 | 20C | OS call specified by contents of A and parameter block |
| OSBYTE | FFF4 | 20A | Misc OS functions specified by accumulator |
| OSCLI | FFF7 | 208 | Pass string to the CLI |