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

More documents

Recommendations

Info

Exit: A Passes the error return code if an error is encountered. Z Set if no error is encountered. 7.6.68 @RDSSC SVC-85 This SVC will read the directory system sector identified by the calling linkage. The cylinder number containing the directory that is loaded into register D is recovered from the Drive Control Table (DCT). The DCT for the each drive is obtained via the @GTDCT SVC. Registers Affected: AF. Entry: HL A pointer to the buffer to receive the sector of system data. D Contains the logical cylinder number to read (0-255). E Contains the logical sector number to read (0-255). C Contains the the logical drive number. Exit: A Passes the error return code if an error is encountered. Z Set if no error is encountered. 7.6.69 @RDTRK SVC-51 This SVC passes a function 11 to a disk driver. It is commonly used for reading an entire track of a floppy disk where permitted by the controller. See chapter 4 for additional information. Registers Affected: AF [Note: DOS saves BC, IY; drivers should save any other registers they use]. Entry: C Logical drive number (0-7). HL A pointer to the buffer which will receive the data transfer. Exit: A Contains an error return code, if any. Z Set if the operation was successful. 7.6.70 @READ SVC-67 This SVC will read a logical record from an open file. If the LRL defined at open time was 256 (0), then the next sequential sector identified by the Next Record Number (NRN) contained in the File Control Block (FCB) will be transferred to the buffer established at open time. For Logical Record Lengths (LRLs) between 1 and 255, the next logical record will be placed into the user record buffer, UREC, identified in the @READ SVC. The 3-byte NRN is updated after the read operation so as to prepare for the next sequential read operation. Registers Affected: AF. DE A pointer to the FCB for the file to read. HL A pointer to the UREC (needed if LRL 0). Exit: A Will contain an error return code if an error was encountered. Z Set if the operation was successful. 7-35
7.6.71 @REMOV SVC-57 This SVC will remove a file. The FCB must be in an open condition prepared by @OPEN or @INIT. The file's directory will be updated by resetting the activity bit (bit-4 of DIR+0), the corresponding Directory Entry Code (DEC) in the Hash Index Table (HIT ) will be set to zero, and the space occupied by the file will be deallocated from the Granule Allocation Table (GAT). The 32-byte FCB will be set to zeroes upon successful commpletion of the file's removal. If the control block contained data appropriate to an opened device, the @REMOVE SVC will treat the request as if it were an @CLOSE request. Devices can only be removed via the RESET library command. Registers Affected: AF. Entry: DE A pointer to the open File Control Block (FCB) of the file. Exit: A Will contain an error code if an error is encountered. Z Set if no error is detected. 7.6.72 @RENAM SVC-56 This SVC can be used to change the filename or extension fields of a file stored on disk. The access protection level must permit renaming for the operation to be successful. Registers Affected: AF. Entry: DE A pointer to the File Control Block (FCB) containing the filespec of the file to be renamed. HL A pointer to the FCB containing the new filename/extension. Exit: A Will contain an error code if an error is encountered. Z Set if no error is detected. 7.6.73 @REW SVC-68 This SVC will rewind a file to its beginning and reset the 3-byte NRN pointer to 0. The next record that will be transferred for I/O with a @READ/@WRITE request will be the first record of the file. Registers Affected: AF. Entry: DE A pointer to the FCB for the file that you want to rewind. Exit: A Will contain an error return code if an error was encountered. Z Set if the operation was successful. 7.6.74 @RMTSK SVC-30 This SVC will remove an interrupt level task from the Task Control Block Vector Table (TCBVT). See Chapter 8, Appendix, on TASK PROCESSOR for detailed information on the use of this SVC. Registers Affected: AF, DE, HL. Entry: C Contains the task assignment slot (0-11) to remove. 7-36
Page 1 and 2:
MISOSYS, INC. The Programmer's Guid
Page 3 and 4:
1. Introduction Many thousands of u
Page 5 and 6:
language (i.e. BASIC, C, PASCAL, ..
Page 7 and 8:
NAME START END DESCRIPTION LOWCORE
Page 9 and 10:
ackup utility provides exceptional
Page 11 and 12:
3. Device Input/Output Interfacing
Page 13 and 14:
3.2.2 VECTOR Field - This field in
Page 15 and 16:
FILTER *PR USING *S0 the operating
Page 17 and 18:
===================================
Page 19 and 20:
===================================
Page 21 and 22:
ENTRY JR BEGIN ;Branch around linka
Page 23 and 24:
DATA1 EQU $-DATA$ DB 0 ;Data storag
Page 25 and 26:
Offset Contents +0 Contains the las
Page 27 and 28:
image of the serial port UART statu
Page 29 and 30:
called TRACKs. Each track is then d
Page 31 and 32:
The DCT contains the information re
Page 33 and 34:
accessed a single-sided diskette, t
Page 35 and 36:
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 and 88: Note: @EXIT in SYS1 automatically r
Page 89 and 90: 7.6.10 @CLOSE SVC-60 This SVC will
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: 0-14 FILENAME/EXT:D - left justifie
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
Page 139 and 140: 8.7.3 Details of Low Memory Page 2
Page 141 and 142: actual bank switching. As previousl
Page 143 and 144: set. Thus, the Z-flag will be indic
Page 145 and 146: 8.10 SYSTEM DISK BOOT TRACK The ope
Page 147 and 148: 14 DEBUG 72 PURGE 1B VERIFY 71 DUMP
Page 149 and 150: 8.13 USING @PARAM The @PARAM SuperV
Page 151 and 152: DW LPARM+1 DB 'FEED ' ;Line feed pa
Page 153 and 154: ;*=*=* PPARM LD BC,0 ;Zero because
Page 155 and 156: 8.14 TRAP Filter Illustrated ;TRAP/
Page 157 and 158: 8.15 SLASH0 Filter Illustrated ;SLA
Page 159 and 160: 8.16 DMP-500 BOLDFACE Filter Illust
Page 161 and 162:
NOMEM$ DB 'High memory is not avail
Page 163 and 164:
@ @ABORT..........7-2, 7-4, 7-8, 7-
show all

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

Create successful ePaper yourself

Delete template?

Save as template?