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

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8.7.1 Details of Low Memory Page 0 Bytes Use 00-02# RST 00 - Reserved for system use 03-04 reserved 05-07 reserved 08-0A# RST 08 - Available to applications 0B-0C SVCRET$- Return address from SVC invocation 0D LSVC$ - Last SVC invoked 0E-0F FDDINT$- Used by FDC driver for SYSTEM (SMOOTH) 10-12# RST 16 - Available to applications 13-17 USTOR$ - User application storage area 18-1A# RST 24 - Available to applications 1B PDRV$ - Physical address of current drive 1C-1D PHIGH$ - Physical high memory 1E-1F* LOW$ - Lowest usable address of high memory 20-22# RST 32 - Available to applications 23 LDRV$ - Logical address of current drive 24-25 JDCB$ - Saved FCB pointer 26-27 JRET$ - Saved I/O return address 28-2A# RST 40 - System SVC call 2B TIMSL$ - Time slice counter 2C* TIMER$ - RTC counter [always precedes TIME$] 2D-2F* TIME$ - Time string storage area 30-32# RST 48 - DEBUG call address 33-37* DATE$ - Date string storage 38-3A# RST 56 - Maskable interrupt vector 3B* OSRLS$ - DOS release number 3C INTIM$ - Interrupt latch image 3D INTMSK$ - Mask for INTIM$ 3E-4D INTVC$ - Table of 8 interrupt latch vectors 4E-65* TCBVT$ - Table of 12 interrupt task vectors 66-68# NMIVCT - Non-maskable interrupt vector 69* OVRLY$ - Current system overlay resident 6A-83* FLAGS$ - 26 system flags [A-Z] in order 84* SVCTP$ - SVC table hi-order byte pointer 85* OSVER$ - Operating system version 86-88* @ICNFG - Initialization configuration vector 89-8B* @KITSK - Keyboard task vector 8C-9F SFCB$ - System file control block A0-BF DBGSV$ - DEBUG register save area C0-DF JFCB$ - JCL File Control Block E0-FF CFCB$ - Comand interpreter File Control Block 8.7.2 Details of Low Memory Page 1 Bytes Use 00-FF* SVCTAB$ - 128 vectors for SVC's 0-127 8-19
8.7.3 Details of Low Memory Page 2 Bytes Use 00* BUR$ - Bank Used RAM image 01* BAR$ - Bank available RAM image 02* LBANK$ - Currently resident RAM bank 03-05 JCLCB$ - Mini DCB for JCL line input 06-07* DVRHI$ - First available byte in I/O driver region 08-0F* KIDCB$ - Keyboard Input Device Control Block 10-17* DODCB$ - Video Device Control Block 18-1F* PRDCB$ - Printer Device Control Block 20-27* SIDCB$ - Standard Input Device Control Block 38-2F* SODCB$ - Standard Output Device Control Block 30-37* JLDCB$ - Job Log Device Control Block 38-FF* spare DCBs [25 of them] 8.7.4 Details of Low Memory Page 4 Bytes Use 00 reserved 01 ZERO$ - set to X'00' 02-0D MAXDAY$- [31,28,31,30,31,30,31,31,30,31,30,31] 0E-0F* HIGH$ - Highest free address in user RAM 10-1F reserved 20-6F* INBUF$ - Command line input buffer 70-BF* DCT$ - Drive Control Table records C0-C6 reserved for use by system C7-DB DAYTBL - Days of the week [SunMon...] DC-FF MONTBL$- Months of the year [JanFeb...] 8-20
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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
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does exist, @RENAME should return e
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Next, it would be very useful if th
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LD HL,FCBX+9 ;Point to the LRL fiel
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operating system for such a purpose
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position where the last character i
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ecord. If a file has more than four
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DE Contains a pointer to the File C
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@RENAM SVC-56 Rename a file on disk
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@FNAME SVC-80 Obtain filespec given
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@WRSEC SVC-53 Write a disk sector @
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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 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: LD (IX+2),15 JR TASKA By firmly und
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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