70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* BIOS interrupt 11h handler
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "miscemu.h"
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#include "msdos.h"
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#include "drive.h"
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#include "stddebug.h"
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#include "debug.h"
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/**********************************************************************
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* INT_Int11Handler
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*
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* Handler for int 11h (get equipment list).
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*/
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void INT_Int11Handler( CONTEXT *context )
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{
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int diskdrives = 0;
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int parallelports = 0;
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int serialports = 0;
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int x;
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/* borrowed from Ralph Brown's interrupt lists
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bits 15-14: number of parallel devices
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bit 13: [Conv] Internal modem
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bit 12: reserved
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bits 11- 9: number of serial devices
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bit 8: reserved
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bits 7- 6: number of diskette drives minus one
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bits 5- 4: Initial video mode:
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00b = EGA,VGA,PGA
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01b = 40 x 25 color
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10b = 80 x 25 color
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11b = 80 x 25 mono
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bit 3: reserved
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bit 2: [PS] =1 if pointing device
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[non-PS] reserved
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bit 1: =1 if math co-processor
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bit 0: =1 if diskette available for boot
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*/
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/* Currently the only of these bits correctly set are:
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bits 15-14 } Added by William Owen Smith,
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bits 11-9 } wos@dcs.warwick.ac.uk
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bits 7-6
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bit 2 (always set)
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*/
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if (DRIVE_IsValid(0)) diskdrives++;
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if (DRIVE_IsValid(1)) diskdrives++;
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if (diskdrives) diskdrives--;
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for (x=0; x!=MAX_PORTS; x++)
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{
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if (COM[x].devicename)
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serialports++;
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if (LPT[x].devicename)
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parallelports++;
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}
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if (serialports > 7) /* 3 bits -- maximum value = 7 */
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serialports=7;
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if (parallelports > 3) /* 2 bits -- maximum value = 3 */
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parallelports=3;
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AX_reg(context) = (diskdrives << 6) | (serialports << 9) |
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(parallelports << 14) | 0x02;
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}
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