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 #include "../../fileio.h"
  14
  15 void FLOPPY::reset()
  16 {
  17         ctrlreg = 0x80;
  18         modereg = 0x03;
  19 }
  20
  21 void FLOPPY::write_io8(uint32 addr, uint32 data)
  22 {
  23         switch(addr & 0xffff) {
  24         case 0xca:
  25                 d_fdc->write_io8(1, data);
  26                 break;
  27         case 0xcc:
  28                 if(!(ctrlreg & 0x80) && (data & 0x80)) {
  29                         d_fdc->reset();
  30                 }
  31                 d_fdc->write_signal(SIG_UPD765A_FREADY, data, 0x40);
  32                 d_fdc->write_signal(SIG_UPD765A_MOTOR, data, 0x08);
  33                 ctrlreg = data;
  34                 break;
  35         case 0xbe:
  36                 modereg = data;
  37                 break;
  38         }
  39 }
  40
  41 uint32 FLOPPY::read_io8(uint32 addr)
  42 {
  43         switch(addr & 0xffff) {
  44         case 0xc8:
  45                 return d_fdc->read_io8(0);
  46         case 0xca:
  47                 return d_fdc->read_io8(1);
  48         case 0xcc:
  49                 return (d_fdc->disk_inserted() ? 0x10 : 0) | 0x64;
  50         case 0xbe:
  51                 return (modereg & 0x03) | 0x08;
  52         }
  53         return addr & 0xff;
  54 }
  55
  56 #define STATE_VERSION   1
  57
  58 void FLOPPY::save_state(FILEIO* state_fio)
  59 {
  60         state_fio->FputUint32(STATE_VERSION);
  61         state_fio->FputInt32(this_device_id);
  62
  63         state_fio->FputUint8(ctrlreg);
  64         state_fio->FputUint8(modereg);
  65 }
  66
  67 bool FLOPPY::load_state(FILEIO* state_fio)
  68 {
  69         if(state_fio->FgetUint32() != STATE_VERSION) {
  70                 return false;
  71         }
  72         if(state_fio->FgetInt32() != this_device_id) {
  73                 return false;
  74         }
  75         ctrlreg = state_fio->FgetUint8();
  76         modereg = state_fio->FgetUint8();
  77         return true;
  78 }
  79