The Programmer's Guide to TRSDOS Version 6 - Tim Mann's Home ...

@CMNDR SVC-25 Execute a command and return
@ERROR SVC-26 Post an error message
@DEBUG SVC-27 Enter system DEBUG package
@CKTSK SVC-28 Check task slot availability
@ADTSK SVC-29 Add a task process
@RMTSK SVC-30 Remove a task assignment
@RPTSK SVC-31 Replace a task assignment during execution
@KLTSK SVC-32 Remove task assignment during execution
@CKDRV SVC-33 Check disk drive availability (& log)
@DODIR SVC-34 Obtain or display directory data
@RAMDIR SVC-35 Obtain directory information
rsvd SVC-36 reserved
rsvd SVC-37 reserved
rsvd SVC-38 reserved
rsvd SVC-39 reserved
@DCSTAT SVC-40 Test disk controller status
@SLCT SVC-41 Select a disk drive
@DCINIT SVC-42 Initialize a disk controller
@DCRES SVC-43 Reset a disk controller
@RSTOR SVC-44 Restore a drive to cylinder 0
@STEPI SVC-45 Issue track step-in to controller
@SEEK SVC-46 Seek to a disk cylinder
@RSLCT SVC-47 Reselect a busy drive until available
@RDHDR SVC-48 Read ID field (where supported)
@RDSEC SVC-49 Read a disk sector
@VRSEC SVC-50 Verify the readability of a disk sector
@RDTRK SVC-51 Read a disk track (where supported)
@HDFMT SVC-52 Pass "format device" to controller
@WRSEC SVC-53 Write a disk sector
@WRSSC SVC-54 Write a disk directory sector
@WRTRK SVC-55 Write a disk track (format data)
@RENAM SVC-56 Rename a file on disk
@REMOV SVC-57 Remove a file from disk
@INIT SVC-58 Open a new or existing file
@OPEN SVC-59 Open an existing file
@CLOSE SVC-60 Close an open disk file
@BKSP SVC-61 File record backspace
@CKEOF SVC-62 Check for file's end-of-file (EOF)
@LOC SVC-63 Return file's current record number
@LOF SVC-64 Return file's ending record number
@PEOF SVC-65 Position to the end of a file
@POSN SVC-66 Position to a designated record of a file
@READ SVC-67 Read a file record
@REW SVC-68 Rewind a file to its beginning
@RREAD SVC-69 Reread the last sector read
@RWRIT SVC-70 Rewrite the last sector written
@SEEKSC SVC-71 Seek a record of a file
@SKIP SVC-72 Skip the next record of a file
@VER SVC-73 Write then verify a file record
@WEOF SVC-74 Directory update a file's end-of-file
@WRITE SVC-75 Write a file record
@LOAD SVC-76 Load a program file
@RUN SVC-77 Run a program given its filespec
@FSPEC SVC-78 Fetch and parse a file specification
@FEXT SVC-79 Fetch a default file extension
7-5