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

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7.6.8 @CKDRV SVC-33 This routine will check a drive reference to ensure that the drive is in the system and a formatted diskette is in place. It will also "log" the disk as far as density, number of sides, and directory cylinder so that the Drive Control Table information is correct. Registers Affected: AF. Entry: C Logical drive number Exit: Z If drive is ready. NZ If drive is not ready A Indeterminate and irrelevant. CF Set if disk is write protected. @CKEOF SVC-62 This SVC will check for the end-of-file at the current logical record number. Registers Affected: AF. Entry: DE A pointer to the FCB for the file to check. Exit: A Error return code. If not X'1C', then some other error has been encountered. It is necessary to get NZ and A=X'1C' for the proper EOF indication. Z Set if not at the end of file and no error is encountered. 7.6.9 @CKTSK SVC-28 This SVC will check if the referenced task slot (0-11) is available for use. See Chapter 8, the Appendix, on TASK PROCESSOR for further details. Registers Affected: AF, HL. Entry: C => The task slot number (0-11). Exit: Z Indicates that the task slot is available. NZ Indicates that the task slot is in use. 7-13
7.6.10 @CLOSE SVC-60 This SVC will close a file or device. If a file is closed, the directory is updated which is essential. All files that have been opened with UPDATE access or greater must be closed. Registers Affected: AF. Entry: DE A pointer to your File or Device Control Block. Exit: A Will contain any error return code. Z Set if no error was encountered. 7.6.11 @CLS SVC-105 This SVC was installed in release 6.2.0. It will clear the video screen via an @DSP of HOME and CLEAR-TO-END-OF-FRAME. Registers Affected: AF Exit: Z Set if no error was encountered, otherwise reset (i.e. NZ). A Contains the error code under an NZ condition. 7.6.12 @CMNDI SVC-24 This SVC passes control to the command interpreter. Your command string will be invoked just as if it was entered in response to a "DOS Ready". Registers Affected: Not applicable.. Entry: HL A pointer to the start of a line buffer containing your command string terminated with an (X'0D'). Only the first 79 characters of your command string will be used. 7.6.13 @CMNDR SVC-25 This SVC will execute a command similarly to @CMNDI; however, upon completion of the command, control will be returned to the address following the @CMNDR invocation. It is necessary for all executing commands to maintain the stack pointer and exit via an RET instruction after loading HL with the return code. It is possible to limit the execution to DOS LIBrary commands by setting bit-4 of the CFLAG$ (see @FLAGS SVC). Registers Affected: Dependent on command executed. Entry: HL A pointer to the start of a line buffer containing your command string terminated with an (X'0D'). Only the first 79 characters of your command string will be used. Exit: HL Will contain the return code of the executing command. 7.6.14 @CTL SVC-05 This SVC will output a control byte to a logical device. If a device control block is referenced, the TYPE byte must permit CTL operation. The file access routines will ignore @CTL requests and provide a "no error" return code. Control protocol is very unique to each device. See chapter 3, DEVICE INPUT/OUTPUT INTERFACING, for additional information. 7-14
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MISOSYS, INC. The Programmer's Guid
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1. Introduction Many thousands of u
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language (i.e. BASIC, C, PASCAL, ..
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NAME START END DESCRIPTION LOWCORE
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ackup utility provides exceptional
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3. Device Input/Output Interfacing
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3.2.2 VECTOR Field - This field in
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FILTER *PR USING *S0 the operating
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===================================
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===================================
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ENTRY JR BEGIN ;Branch around linka
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DATA1 EQU $-DATA$ DB 0 ;Data storag
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Offset Contents +0 Contains the las
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image of the serial port UART statu
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called TRACKs. Each track is then d
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The DCT contains the information re
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accessed a single-sided diskette, t
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containing the disk's directory. Th
Page 37 and 38: Command Purpose RESTORE Recalibrate
Page 39 and 40: available from Logical Systems, Inc
Page 41 and 42: exceeds this capacity, then it must
Page 43 and 44: is two physical cylinders. Although
Page 45 and 46: 5. The DOS Directory Structure 5.1
Page 47 and 48: ===================================
Page 49 and 50: 5.2.8 PACK NAME - This field conta
Page 51 and 52: The position of a file's hash code
Page 53 and 54: 5.4 THE DIRECTORY RECORD STRUCTURE
Page 55 and 56: Bit 3 Specifies the visibility; if
Page 57 and 58: the first granule in use is the sec
Page 59 and 60: travels the turnpike. In this manne
Page 61 and 62: The @FSPEC SVC will transfer the fi
Page 63 and 64: A high level language permits you t
Page 65 and 66: does exist, @RENAME should return e
Page 67 and 68: Next, it would be very useful if th
Page 69 and 70: LD HL,FCBX+9 ;Point to the LRL fiel
Page 71 and 72: operating system for such a purpose
Page 73 and 74: position where the last character i
Page 75 and 76: ecord. If a file has more than four
Page 77 and 78: DE Contains a pointer to the File C
Page 79 and 80: @RENAM SVC-56 Rename a file on disk
Page 81 and 82: @FNAME SVC-80 Obtain filespec given
Page 83 and 84: @WRSEC SVC-53 Write a disk sector @
Page 85 and 86: 7.6 SUPERVISOR CALL DETAILS 7.6.1 @
Page 87: Note: @EXIT in SYS1 automatically r
Page 91 and 92: 7.6.18 @DCSTAT SVC-40 This SVC pass
Page 93 and 94: Directory to Buffer Entry: B 1; Fun
Page 95 and 96: 7.6.31 @FLAGS$ SVC-101 This SVC wil
Page 97 and 98: NFLAG$ This "network" flag is used
Page 99 and 100: 7.6.32 @FNAME SVC-80 This SVC will
Page 101 and 102: 7.6.40 @HEX8 SVC-98 This SVC will c
Page 103 and 104: 7.6.48 @KLTSK SVC-32 This SVC will
Page 105 and 106: 7.6.57 @OPEN SVC-59 This SVC will o
Page 107 and 108: Registers Affected: AF, BC. Entry:
Page 109 and 110: 0-14 FILENAME/EXT:D - left justifie
Page 111 and 112: 7.6.71 @REMOV SVC-57 This SVC will
Page 113 and 114: Entry: DE A pointer to the FCB cont
Page 115 and 116: Exit: A Error return code, if any.
Page 117 and 118: CURSOR CHARACTER Registers Affected
Page 119 and 120: Exit: A Will contain the error code
Page 121 and 122: esident routine into its execution
Page 123 and 124: CKPAWS LD A,@FLAGS$ ;Get Flags poin
Page 125 and 126: ===================================
Page 127 and 128: The TYPE=0A indicates that it is th
Page 129 and 130: Error 08: Device not available A re
Page 131 and 132: Error 28: End of file encountered T
Page 133 and 134: 8.5 HEADER PROTOCOL OF MEMORY MODUL
Page 135 and 136: This is obviously an extremely usel
Page 137 and 138: LD (IX+2),15 JR TASKA By firmly und
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8.7.3 Details of Low Memory Page 2
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actual bank switching. As previousl
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set. Thus, the Z-flag will be indic
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8.10 SYSTEM DISK BOOT TRACK The ope
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14 DEBUG 72 PURGE 1B VERIFY 71 DUMP
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8.13 USING @PARAM The @PARAM SuperV
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DW LPARM+1 DB 'FEED ' ;Line feed pa
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;*=*=* PPARM LD BC,0 ;Zero because
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8.14 TRAP Filter Illustrated ;TRAP/
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8.15 SLASH0 Filter Illustrated ;SLA
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8.16 DMP-500 BOLDFACE Filter Illust
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NOMEM$ DB 'High memory is not avail
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@ @ABORT..........7-2, 7-4, 7-8, 7-
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