Table of Contents

SVC API

Supervisor calls API aimed to call host services from MVM.

Functions

Function Name INT 21h equivalent Description
0 SVC_DUPHANDLE AH=45h Duplicate handle (params and result same as in INT 21H AH=45H)
1 SVC_ERROREXIT — Terminate MVM with error message (top of stack - far pointer to message ASCIIZ)
2 SVC_EXIT AH=4Ch Terminate MVM and return code to parent process from AX
3 SVC_CLOSE AH=3Eh Close file handle (interface not investigated yet)
4 SVC_RESETDISK AH=0Dh Reset disk buffers
5 SVC_GETPSP AH=62h Get current PSP (interface not investigated yet)
6 SVC_SELECTDRIVE AH=0Eh Select default drive (params and result same as in INT 21H AH=0EH)
7 SVC_SETDTA AH=1Ah Set DTA from DS:DX (params and result same as in INT 21H AH=1AH)
8 SVC_GETVERSION AH=30h Get version (interface not investigated yet)
9 SVC_WRITE AH=40h Write file handle (interface not investigated yet)
10 SVC_SETDATE AH=2Bh Set system date (params and result same as in INT 21H AH=2BH)
11 SVC_SETTIME AH=2Dh Set system time (params and result same as in INT 21H AH=2DH)
12 SVC_GETDATE AH=2Ah Get system date (result same as in INT 21H AH=2AH)
13 SVC_GETTIME AH=2Ch Get system time (result same as in INT 21H AH=2CH)
14 SVC_READ AH=3Fh Read file handle (interface not investigated yet)
15 SVC_CHGFILEPTR AH=42h Set file handle position (interface not investigated yet)
16 SVC_RMDIR AH=3Ah Delete directory (params and result same as in INT 21H AH=3AH)
17 SVC_MKDIR AH=39h Create directory (interface not investigated yet)
18 SVC_QCURDIR AH=47h Get current directory (params and result same as in INT 21H AH=47H)
19 SVC_CHDIR AH=3Bh Change directory (params and result same as in INT 21H AH=3BH)
20 SVC_GETSETFILETIME AH=57h Get/Set file time (interface not investigated yet)
21 SVC_COMMITFILE AH=68h Commit file (interface not investigated yet)
22 SVC_FINDFIRSTFCB AH=11h Find first file using FCB (interface not investigated yet)
23 SVC_FINDNEXTFCB AH=12h Find next file using FCB (interface not investigated yet)
24
25 SVC_FINDFIRST AH=4Eh Find first file (interface not investigated yet)
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28 SVC_OPEN AH=3Dh Open file (interface not investigated yet)
29 SVC_DELETEFCB AH=13h Delete file using FCB (DS:DX → unopened FCB, ES → environment segment)
30 SVC_RENAMEFCB AH=17h Rename file using FCB (params and result same as in INT 21H AH=17H)
31 SVC_DELETE AH=41h Delete file (interface not investigated yet)
32 SVC_MOVE AH=56h Rename file (interface not investigated yet)
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37 SVC_OPENFCB AH=0Fh Open file using FCB (interface not investigated yet)
38
39 SVC_CLOSEFCB AH=10h Close file using FCB (interface not investigated yet)
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44 SVC_SETVERIFY AH=2Eh Set VERIFY flag from AL
45 SVC_FINDNEXT AH=4Fh Find next file (interface not investigated yet)
46 SVC_CREATE AH=3Ch Create new file (interface not investigated yet)
47 SVC_CREATETEMP AH=5Ah Create temp file (interface not investigated yet)
48
49 SVC_PARSEFILENAME AH=29h Parse filename to FCB (params and result same as in INT 21H AH=29H) – creates an unopened FCB from an ASCIIZ string
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61 SVC_ABSDISKREAD INT 25h Absolute disk read (interface not investigated yet; corresponds to INT 25h)
62 SVC_ABSDISKWRITE INT 26h Absolute disk write (interface not investigated yet; corresponds to INT 26h)
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Structures

SVC API
Supervisor calls 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85
Structures FCB XFCB FILETIME FILEDATE
2024/11/07 03:44 · prokushev · 0 Comments