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
  13 void FLOPPY::initialize()
  14 {
  15         intr = false;
  16 }
  17
  18 void FLOPPY::write_io8(uint32_t addr, uint32_t data)
  19 {
  20         if(!supported) {
  21                 // OA-BASIC without floppy drives
  22                 return;
  23         }
  24
  25         switch(addr & 0xff) {
  26         case 0xe0:
  27                 // tc off
  28                 d_fdc->write_signal(SIG_UPD765A_TC, 0, 1);
  29                 break;
  30         case 0xe2:
  31                 // tc on
  32                 d_fdc->write_signal(SIG_UPD765A_TC, 1, 1);
  33                 break;
  34         case 0xe4:
  35         case 0xe5:
  36                 d_fdc->write_io8(addr, data);
  37                 break;
  38         case 0xe6:
  39                 // fdc reset
  40                 if(data & 0x80) {
  41                         d_fdc->reset();
  42                 }
  43                 // motor on/off
  44                 d_fdc->write_signal(SIG_UPD765A_MOTOR, data, 0x40);
  45                 break;
  46         }
  47 }
  48
  49 uint32_t FLOPPY::read_io8(uint32_t addr)
  50 {
  51         if(!supported) {
  52                 // OA-BASIC without floppy drives
  53                 return 0xff;
  54         }
  55
  56         switch(addr & 0xff) {
  57         case 0xe4:
  58         case 0xe5:
  59                 return d_fdc->read_io8(addr);
  60         case 0xe6:
  61                 // fdc intr
  62                 return intr ? 0x80 : 0;
  63         }
  64         return 0xff;
  65 }
  66
  67 void FLOPPY::write_signal(int id, uint32_t data, uint32_t mask)
  68 {
  69         if(id == SIG_FLOPPY_INTR) {
  70                 intr = ((data & mask) != 0);
  71         }
  72 }
  73
  74 #define STATE_VERSION   1
  75
  76 void FLOPPY::save_state(FILEIO* state_fio)
  77 {
  78         state_fio->FputUint32(STATE_VERSION);
  79         state_fio->FputInt32(this_device_id);
  80
  81         state_fio->FputBool(intr);
  82         state_fio->FputBool(supported);
  83 }
  84
  85 bool FLOPPY::load_state(FILEIO* state_fio)
  86 {
  87         if(state_fio->FgetUint32() != STATE_VERSION) {
  88                 return false;
  89         }
  90         if(state_fio->FgetInt32() != this_device_id) {
  91                 return false;
  92         }
  93         intr = state_fio->FgetBool();
  94         supported = state_fio->FgetBool();
  95         return true;
  96 }
  97