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

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Bit 5 If set, it indicates that FORMS is active. Bit 6 If set, it indicates that KSM is active. Bit 7 Set if printer supports block graphics for screen print. EFLAG$ This flag byte is used to indicate the presence of an Extended Command Interpreter (ECI) program in the SYS13/SYS slot. A non-zero value indicates that the user's ECI be used to interpret the command line instead of the system's command interpreter. On entry to your ECI, bits 4-6 of this flag are imaged in the accumulator and are available for immediate test. IFLAG$ This flag is used in international systems. Bit assignments are: Bit 0 Set to indicate French. Bit 1 Set to indicate German. Bit 2 Set to indicate Swiss. Bit 3 reserved Bit 4 reserved Bit 5 reserved Bit 6 Special DMP mode on/off. Bit 7 Set 7-bit ASCII mode on/off. KFLAG$ Bit 0 Set to "1" if BREAK pressed (see KFLAG interfacing and the @CKBRKC SVC-105). Bit 1 Set to "1" if PAUSE pressed (see KFLAG interfacing). Bit 2 Set to "1" if ENTER pressed (see KFLAG interfacing). Bit 3 Reserved by DOS. Bit 4 Reserved by DOS. Bit 5 Set to "1" if in CAPS lock mode of the keyboard. Bit 6 Reserved by DOS. Bit 7 Set to "1" if a character is in the type-ahead buffer. LFLAG$ Bit 0 If set, FORMAT will not prompt for step rate. Bit 1 reserved Bit 2 reserved Bit 3 reserved Bit 4 If set, FLOPPY/DCT will inhibit the 8" query. Bit 5 If set, FORMAT will not prompt for number of sides. Bit 6 Reserved for Interrupt Mode 2 hardware. Bit 7 Reserved for Interrupt Mode 2 hardware. MFLAG$ This flag is machine specific. It is used to contain an image of a particular CPU port. For instance, on the TRS-80 Model 4, this is an image of the MODOUT port (X'EC'). 7-21
NFLAG$ This "network" flag is used for control in network situations. The bits are assigned as follows: Bit 0 If set, the "file-open" bit will be written to the directory when a file is opened with update or higher access. Bit 1 reserved Bit 2 reserved Bit 3 reserved Bit 4 reserved Bit 5 reserved Bit 6 Set if the system's task processor is in control. NOTE: do not execute an EI instruction within any driver or filter routine if this bit is set. Bit 7 - reserved OFLAG$ This flag is machine specific. It is used to contain an image of a particular CPU port - generally dealing with memory management. For instance, on the TRS-80 Model 4, this is an image of the OPREG port (84). PFLAG$ This flag is assigned to printer operations. Bits are as follows: Bit 0 - reserved Bit 1 - reserved Bit 2 - reserved Bit 3 - reserved Bit 4 - reserved Bit 5 - reserved Bit 6 - reserved Bit 7 - Set to 1 if the SPOOLer is in a paused state. SFLAG$ Bit 0 This is the FORCE-TO-READ flag. If set prior to issuing an @OPEN, then the system will not check for matching LRL nor will the system set the "file open bit" in the directory for the opened file. However, the file will be restricted to READ access (unless a lower access is detected during the open. This bit will be automatically reset by @OPEN. Bit 1 This bit will be set by @OPEN if an EXEC-only file is opened and bit-2 of SFLAG$ is set. Under these conditions, @OPEN will change the access granted to READ so that @LOAD can load the file. Thus, the application (for instance BASIC) can load an EXEC-only file to be RUN while still detecting the EXEC protection status. Bit 2 Set this bit to enable the loading of an EXEC-only file. This bit works in conjunction with bit-1. Bit 3 Set to "1" if SYSTEM (FAST) has been established. Bit 4 Set to "1" to disable the BREAK key. Bit 5 Set to "1" if DO is in effect executing Job Control Language. Bit 6 Set to "1" to force extended error messages. This is only practical in a debugging environment. 7-22
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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
Page 15 and 16:
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
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: 7.6.31 @FLAGS$ SVC-101 This SVC wil
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
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
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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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