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

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HL Contains the row (0-23) in register H, and column (0-79) in L. Exit: A Will contain the error code if an error was encountered. Z Set if the operation was successful. OBTAIN CURSOR POSITION Registers Affected: AF, B, HL. Entry: B 4; Obtains the current cursor position by row and column. Exit: HL Contains the row (0-23) in register H, and column (0-79) in L. A Will contain the error code if an error was encountered. BUFFER TO VIDEO Registers Affected: AF, BC, DE, HL. Entry: B 5; Moves a BLOCK of RAM to the video RAM. HL A pointer to the user's RAM BLOCK. Exit: A Will contain the error code if an error was encountered. Z Set if the operation was successful. BLOCK is 1920 bytes for 6.2, 2048 bytes for 6.0 and 6.1 VIDEO TO BUFFER Registers Affected: AF, BC, DE, HL. Entry: B 6; Moves the video RAM image to a RAM BLOCK. HL A pointer to the user's RAM BLOCK. Exit: A Will contain the error code if an error was encountered. Z Set if the operation was successful. BLOCK is 1920 bytes for 6.2, 2048 bytes for 6.0 and 6.1 SCROLL PROTECT Registers Affected: AF, B. Entry: B 7, Inhibit scrolling of lines at the top of the video screen. C Contains the number of lines to protect (0-7). 7-41
CURSOR CHARACTER Registers Affected: AF, B. Entry: B 8; Change the cursor character. C Contains the new cursor character (or code value). Exit: A Will be returned with the current cursor value (for 6.0.1+). Z Set if the operation was successful. VIDEO LINE TRANSFER Registers Affected: AF, BC, DE, HL. Entry: B 9; Invoke line transfer C transfer direction; 0 = buffer to video, 1 = video to buffer. H video row to transfer (0-23). DE A pointer to the user's 80-character buffer. Exit: A Will contain the error code if an error was encountered. Z Set if the operation was successful. 7.6.89 @VER SVC-73 This SVC will perform a @WRITE operation followed by a test read of the sector (assuming that the WRITE required physical I/O) to verify that it will be readable. The test read will not cause data to be transferred to the file buffer. Registers Affected: AF. Entry: DE A pointer to the FCB for the file to verify. HL A pointer to the user record buffer (UREC) containing the logical record (where the LRL is 256). Exit: A Will contain an error return code if an error was encountered. Z Set if the operation was successful. 7.6.90 @VRSEC SVC-50 This SVC will pass a function 10 to a disk driver. The function should verify the readability of a sector without transferring any data from the disk to the buffer. See chapter 4 for additional information. Registers Affected: AF [Note: DOS saves BC, IY; drivers should save any other registers they use]. Entry: C Contains the logical drive number. D Contain the cylinder number to verify. E Contains the sector number to verify. 7-42
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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
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Command Purpose RESTORE Recalibrate
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available from Logical Systems, Inc
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exceeds this capacity, then it must
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is two physical cylinders. Although
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5. The DOS Directory Structure 5.1
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===================================
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5.2.8 PACK NAME - This field conta
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The position of a file's hash code
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5.4 THE DIRECTORY RECORD STRUCTURE
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Bit 3 Specifies the visibility; if
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the first granule in use is the sec
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travels the turnpike. In this manne
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The @FSPEC SVC will transfer the fi
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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 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: Exit: A Error return code, if any.
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-
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