ACPTR Get data from the serial bus $FFA5 65445 ignored ignored ignored TALK, TKSA See READST 13 Byte from serial bus undefined preserved CHKIN Open a channel for input $FFC6 65478 ignored File number ignored (OPEN) None None undefined undefined preserved CHKOUT Open a channel for output $FFC9 65481 ignored File number ignored (OPEN) 0,3,5,7 (See READST) 4+ undefined undefined preserved CHRIN Get a character from the input channel $FFCF 65487 ignored ignored ignored (OPEN, CHKIN) 0 (See READST) 7+ Retrieved byte undefined preserved CHROUT Output a character $FFD2 65490 Byte to send ignored ignored (CHKOUT,OPEN) 0 (See READST) 8+ undefined preserved preserved CINT Initialize screen editor & 6567 video chip $FF81 65409 ignored ignored ignored None None 4 undefined undefined undefined CIOUT Transmit a byte over the serial bus $FFA8 65448 Byte to send ignored ignored LISTEN, [SECOND] See READST 5 preserved preserved preserved CLALL Close all files $FFE7 65511 ignored ignored ignored None None 11 undefined undefined preserved CLOSE Close a logical file $FFC3 65475 File number ignored ignored None 0,240 (See READST) 2+ undefined undefined undefined CLRCHN Clear I/O channels $FFCC 65484 ignored ignored ignored None None 9 undefined undefined preserved GETIN Get a character $FFE4 65508 ignored ignored ignored CHKIN, OPEN See READST 7+ undefined undefined undefined IOBASE Locate I/O memory page $FFF3 65523 ignored ignored ignored None None 2 preserved Low byte of I/O hardware location High byte of I/O hardware location IOINIT Initialize I/O devices $FF84 65412 ignored ignored ignored None None None undefined undefined undefined LISTEN Command a device on the serial bus to listen Call Address: $FFB1 65457 Device number ignored ignored None See READST None undefined preserved preserved LOAD Load RAM from device $FFD5 65493 0 for Load, 1 for Verify [Low byte of load address] [High byte of load address] SETLFS, SETNAM 0,4,5,8,9, READST None undefined Low byte of ending address High byte of ending address MEMBOT Set bottom of RAM $FF9C 65436 ignored [Low byte of new RAM bottom] [High byte of new RAM bottom] None None None preserved [Low byte of current RAM bottom] [High byte of current RAM bottom] MEMTOP Set the top of RAM $FF99 65433 ignored [Low byte of new RAM top] [High byte of new RAM top] None None 2 preserved [Low byte of current RAM top] [High byte of current RAM top] OPEN Open a logical file $FFC0 65472 ignored ignored ignored SETLFS, SETNAM 1,2,4,5,6,240, READST None undefined undefined undefined PLOT Set cursor location $FFF0 65520 ignored [New cursor row] [New cursor column] None None 2 undefined [Current cursor row] [Current cursor column] RAMTAS Perform RAM test $FF87 65415 ignored ignored ignored None None 2 undefined undefined undefined RDTIM Read system clock $FFDE 65502 ignored ignored ignored None None 2 High byte of system time Middle byte of system time Low byte of system time READST Read I/O status $FFB7 65463 ignored ignored ignored None None 2 Status code preserved preserved RESTOR Restore default system and interrupt vectors $FF8A 65418 ignored ignored ignored None None 2 undefined undefined undefined SAVE Save memory to a device $FFD8 65496 Zero-page location of the start address pointer Low byte of ending address High byte of ending address SETLFS, SETNAM 5,8,9, READST None undefined undefined undefined SCNKEY Scan the keyboard $FF9F 65439 ignored ignored ignored IOINIT None 5 undefined undefined undefined SCREEN Return screen format $FFED 65517 ignored ignored ignored None None 2 preserved Number of screen columns Number of screen rows SECOND Send secondary address for LISTEN $FF93 65427 Secondary address ignored ignored LISTEN See READST 8 undefined preserved preserved SETLFS Set up a logical file $FFBA 65466 Logical file number Device number Command None None 2 None SETMSG Control system message output $FF90 65424 A None None 2 A SETNAM Set file name $FFBD 65469 A, X, Y None None 2 None SETTIM Set the system clock $FFDB 65499 A, X, Y None None 2 None SETTMO Set IEEE bus card timeout flag $FFA2 65442 A None None 2 None STOP Check if key is pressed $FFE1 65505 A None None None A, X TALK Command a device on the serial bus to TALK $FFB4 65460 A None See READST 8 A TKSA Send a secondary address to a device commanded to TALK $FF96 65430 A TALK See READST 8 A UDTIM Update the system clock $FFEA 65514 None None None 2 A, X UNLSN Send an UNLISTEN command $FFAE 65454 None None See READST 8 A VECTOR Manage RAM vectors $FF8D 65421 X, Y None None 2 A, X, Y 1