| Preparation | TALK, TKSA | |
| Send | .A | ignored |
| .X | ignored | |
| .Y | ignored | |
| Stack usage | 13 | |
| Address | $FFA5, 65445 | |
| Returns | .A | Byte from serial bus |
| .X | undefined | |
| .Y | preserved | |
| Preparation | SETLFS, SETNAM | |
| Send | .A | 0 for LOAD, 1 for VERIFY |
| .X | Low byte of loading address (if opened w/relocation) | |
| .Y | High byte of loading address (if opened w/relocation) | |
| Stack usage | 0 | |
| Address | $FFD5, 65493 | |
| Returns | .A | undefined |
| .X | Low byte of ending address | |
| .Y | High byte of ending address | |
| Preparation | SETLFS, SETNAM | |
| Send | .A | Zero-page location of Starting Address pointer |
| .X | Low byte of Ending Address | |
| .Y | High byte of Ending Address | |
| Stack usage | 0 | |
| Address | $FFD8, 65496 | |
| Returns | .A | undefined |
| .X | undefined | |
| .Y | undefined | |
| Preparation | SETLFS, SETNAM | |
| Send | .A | ignored |
| .X | ignored | |
| .Y | ignored | |
| Stack usage | 0 | |
| Address | $FFC0, 65472 | |
| Returns | .A | undefined |
| .X | undefined | |
| .Y | undefined | |
| Preparation | none | |
| Send | .A | Length of filename |
| .X | Low byte of address of filename | |
| .Y | High byte of address of filename | |
| Stack usage | 2 | |
| Address | $FFBD, 65469 | |
| Returns | .A | preserved |
| .X | preserved | |
| .Y | preserved | |
| Preparation | none | |
| Send | .A | File number |
| .X | Device unit number | |
| .Y | Secondary address or Command ($FF for no value) | |
| Stack usage | 2 | |
| Address | $FFBA, 65466 | |
| Returns | .A | preserved |
| .X | preserved | |
| .Y | preserved | |
| Preparation | OPEN
| |
| Send | .A | File number |
| .X | ignored | |
| .Y | ignored | |
| Stack usage | 2 | |
| Address | $FFC3, 65475 | |
| Returns | .A | undefined |
| .X | undefined | |
| .Y | undefined | |
| Preparation | [OPEN] | |
| Send | .A | ignored |
| .X | ignored | |
| .Y | ignored | |
| Stack usage | 11 | |
| Address | $FFE7, 65511 | |
| Returns | .A | undefined |
| .X | undefined | |
| .Y | preserved | |
| Preparation | OPEN
| |
| Send | .A | ignored |
| .X | File number | |
| .Y | ignored | |
| Stack usage | 0 | |
| Address | $FFC6, 65478 | |
| Returns | .A | undefined |
| .X | undefined | |
| .Y | reserved | |
| Preparation | OPEN | |
| Send | .A | ignored |
| .X | File number | |
| .Y | ignored | |
| Stack usage | 4+ | |
| Address | $FFC9, 65481 | |
| Returns | .A | undefined |
| .X | undefined | |
| .Y | preserved | |
| Preparation | [OPEN, CHKIN] | |
| Send | .A | ignored |
| .X | ignored | |
| .Y | ignored | |
| Stack usage | 7+ | |
| Address | $FFCF, 65487 | |
| Returns | .A | Retrieved byte |
| .X | undefined | |
| .Y | preserved | |
| Preparation | [OPEN, CHKOUT] | |
| Send | .A | Byte to send |
| .X | ignored | |
| .Y | ignored | |
| Stack usage | 8+ | |
| Address | $FFD2, 65490 | |
| Returns | .A | undefined |
| .X | preserved | |
| .Y | preserved | |
| Preparation | none | |
| Send | .A | ignored |
| .X | ignored | |
| .Y | ignored | |
| Stack usage | 2 | |
| Address | $FFB7, 65463 | |
| Returns | .A | Status code |
| .X | preserved | |
| .Y | preserved | |
