2 * BIOS interrupt 11h handler
9 #include "debugtools.h"
11 /**********************************************************************
14 * Handler for int 11h (get equipment list).
16 void WINAPI INT_Int11Handler( CONTEXT86 *context )
19 int parallelports = 0;
23 /* borrowed from Ralph Brown's interrupt lists
25 bits 15-14: number of parallel devices
26 bit 13: [Conv] Internal modem
28 bits 11- 9: number of serial devices
30 bits 7- 6: number of diskette drives minus one
31 bits 5- 4: Initial video mode:
37 bit 2: [PS] =1 if pointing device
39 bit 1: =1 if math co-processor
40 bit 0: =1 if diskette available for boot
42 /* Currently the only of these bits correctly set are:
43 bits 15-14 } Added by William Owen Smith,
44 bits 11-9 } wos@dcs.warwick.ac.uk
49 if (DRIVE_IsValid(0)) diskdrives++;
50 if (DRIVE_IsValid(1)) diskdrives++;
51 if (diskdrives) diskdrives--;
53 for (x=0; x!=MAX_PORTS; x++)
55 if (COM[x].devicename)
57 if (LPT[x].devicename)
60 if (serialports > 7) /* 3 bits -- maximum value = 7 */
62 if (parallelports > 3) /* 2 bits -- maximum value = 3 */
65 AX_reg(context) = (diskdrives << 6) | (serialports << 9) |
66 (parallelports << 14) | 0x02;