source/src/vm/pc98ha/floppy.cpp

   1 /*
   2         NEC PC-98LT Emulator 'ePC-98LT'
   3         NEC PC-98HA Emulator 'eHANDY98'
   4
   5         Author : Takeda.Toshiya
   6         Date   : 2008.06.11 -
   7
   8         [ floppy ]
   9 */
  10
  11 #include "floppy.h"
  12 #include "../upd765a.h"
  13
  14 void FLOPPY::reset()
  15 {
  16         ctrlreg = 0x80;
  17         modereg = 0x03;
  18 }
  19
  20 void FLOPPY::write_io8(uint32 addr, uint32 data)
  21 {
  22         switch(addr & 0xffff) {
  23         case 0xca:
  24                 d_fdc->write_io8(1, data);
  25                 break;
  26         case 0xcc:
  27                 if(!(ctrlreg & 0x80) && (data & 0x80)) {
  28                         d_fdc->reset();
  29                 }
  30                 d_fdc->write_signal(SIG_UPD765A_FREADY, data, 0x40);
  31                 d_fdc->write_signal(SIG_UPD765A_MOTOR, data, 0x08);
  32                 ctrlreg = data;
  33                 break;
  34         case 0xbe:
  35                 modereg = data;
  36                 break;
  37         }
  38 }
  39
  40 uint32 FLOPPY::read_io8(uint32 addr)
  41 {
  42         switch(addr & 0xffff) {
  43         case 0xc8:
  44                 return d_fdc->read_io8(0);
  45         case 0xca:
  46                 return d_fdc->read_io8(1);
  47         case 0xcc:
  48                 return (d_fdc->is_disk_inserted() ? 0x10 : 0) | 0x64;
  49         case 0xbe:
  50                 return (modereg & 0x03) | 0x08;
  51         }
  52         return addr & 0xff;
  53 }
  54
  55 #define STATE_VERSION   1
  56
  57 void FLOPPY::save_state(FILEIO* state_fio)
  58 {
  59         state_fio->FputUint32(STATE_VERSION);
  60         state_fio->FputInt32(this_device_id);
  61
  62         state_fio->FputUint8(ctrlreg);
  63         state_fio->FputUint8(modereg);
  64 }
  65
  66 bool FLOPPY::load_state(FILEIO* state_fio)
  67 {
  68         if(state_fio->FgetUint32() != STATE_VERSION) {
  69                 return false;
  70         }
  71         if(state_fio->FgetInt32() != this_device_id) {
  72                 return false;
  73         }
  74         ctrlreg = state_fio->FgetUint8();
  75         modereg = state_fio->FgetUint8();
  76         return true;
  77 }
  78