source/src/vm/pc98ha/bios.cpp

   1 /*
   2         NEC PC-98LT Emulator 'ePC-98LT'
   3         NEC PC-98HA Emulator 'eHANDY98'
   4
   5         Author : Takeda.Toshiya
   6         Date   : 2010.05.12 -
   7
   8         [ bios ]
   9 */
  10
  11 #include "bios.h"
  12 #include "../upd765a.h"
  13 #include "../disk.h"
  14
  15 // regs
  16 #define AL      regs8[0]
  17 #define AH      regs8[1]
  18
  19 bool BIOS::bios_int_i86(int intnum, uint16_t regs[], uint16_t sregs[], int32_t* ZeroFlag, int32_t* CarryFlag)
  20 {
  21         static const int check_cmds[16] = {1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0};
  22         uint8_t *regs8 = (uint8_t *)regs;
  23
  24         if(intnum == 0x1b && check_cmds[AH & 0x0f]) {
  25                 switch(AL & 0xf0) {
  26                 case 0x10:
  27                 case 0x70:
  28                         // 2DD
  29                         if(d_fdc->is_disk_inserted(AL & 0x03) && d_fdc->get_media_type(AL & 0x03) != MEDIA_TYPE_2DD) {
  30                                 AH = 0xe0;
  31                                 *CarryFlag = 1;
  32                                 return true;
  33                         }
  34                         break;
  35                 case 0x90:
  36                 case 0xf0:
  37                         // 2HD
  38                         if(d_fdc->is_disk_inserted(AL & 0x03) && d_fdc->get_media_type(AL & 0x03) != MEDIA_TYPE_2HD) {
  39                                 AH = 0xe0;
  40                                 *CarryFlag = 1;
  41                                 return true;
  42                         }
  43                         break;
  44                 }
  45         }
  46         return false;
  47 }