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