source/src/vm/pasopia/floppy.cpp

   1 /*
   2         TOSHIBA PASOPIA Emulator 'EmuPIA'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2012.03.01 -
   6
   7         [ floppy ]
   8 */
   9
  10 #include "floppy.h"
  11 #include "../upd765a.h"
  12 #include "../../fileio.h"
  13
  14 void FLOPPY::initialize()
  15 {
  16         intr = false;
  17 }
  18
  19 void FLOPPY::write_io8(uint32 addr, uint32 data)
  20 {
  21         if(!supported) {
  22                 // OA-BASIC without floppy drives
  23                 return;
  24         }
  25
  26         switch(addr & 0xff) {
  27         case 0xe0:
  28                 // tc off
  29                 d_fdc->write_signal(SIG_UPD765A_TC, 0, 1);
  30                 break;
  31         case 0xe2:
  32                 // tc on
  33                 d_fdc->write_signal(SIG_UPD765A_TC, 1, 1);
  34                 break;
  35         case 0xe4:
  36         case 0xe5:
  37                 d_fdc->write_io8(addr, data);
  38                 break;
  39         case 0xe6:
  40                 // fdc reset
  41                 if(data & 0x80) {
  42                         d_fdc->reset();
  43                 }
  44                 // motor on/off
  45                 d_fdc->write_signal(SIG_UPD765A_MOTOR, data, 0x40);
  46                 break;
  47         }
  48 }
  49
  50 uint32 FLOPPY::read_io8(uint32 addr)
  51 {
  52         if(!supported) {
  53                 // OA-BASIC without floppy drives
  54                 return 0xff;
  55         }
  56
  57         switch(addr & 0xff) {
  58         case 0xe4:
  59         case 0xe5:
  60                 return d_fdc->read_io8(addr);
  61         case 0xe6:
  62                 // fdc intr
  63                 return intr ? 0x80 : 0;
  64         }
  65         return 0xff;
  66 }
  67
  68 void FLOPPY::write_signal(int id, uint32 data, uint32 mask)
  69 {
  70         if(id == SIG_FLOPPY_INTR) {
  71                 intr = ((data & mask) != 0);
  72         }
  73 }
  74
  75 #define STATE_VERSION   1
  76
  77 void FLOPPY::save_state(FILEIO* state_fio)
  78 {
  79         state_fio->FputUint32(STATE_VERSION);
  80         state_fio->FputInt32(this_device_id);
  81
  82         state_fio->FputBool(intr);
  83         state_fio->FputBool(supported);
  84 }
  85
  86 bool FLOPPY::load_state(FILEIO* state_fio)
  87 {
  88         if(state_fio->FgetUint32() != STATE_VERSION) {
  89                 return false;
  90         }
  91         if(state_fio->FgetInt32() != this_device_id) {
  92                 return false;
  93         }
  94         intr = state_fio->FgetBool();
  95         supported = state_fio->FgetBool();
  96         return true;
  97 }
  98