source/src/vm/mz700/floppy.cpp

   1 /*
   2         SHARP MZ-800 Emulator 'EmuZ-800'
   3         SHARP MZ-1500 Emulator 'EmuZ-1500'
   4
   5         Author : Takeda.Toshiya
   6         Date   : 2011.05.16-
   7
   8         [ floppy ]
   9 */
  10
  11 #include "floppy.h"
  12 #include "../mb8877.h"
  13
  14 #define EVENT_MOTOR_ON  0
  15 #define EVENT_MOTOR_OFF 1
  16
  17 void FLOPPY::initialize()
  18 {
  19         prev_dc = 0;
  20         motor_on = false;
  21
  22         // always motor on (temporary)
  23 //      d_fdc->write_signal(SIG_MB8877_MOTOR, 1, 1);
  24 }
  25
  26 void FLOPPY::reset()
  27 {
  28         register_id = -1;
  29         irq_enabled = false;
  30 }
  31
  32 void FLOPPY::write_io8(uint32_t addr, uint32_t data)
  33 {
  34         switch(addr & 0xff) {
  35         case 0xdc:
  36                 // drive reg
  37                 if(data & 4) {
  38                         d_fdc->write_signal(SIG_MB8877_DRIVEREG, data, 3);
  39                 }
  40                 // motor on/off
  41                 if(!(prev_dc & 0x80) && (data & 0x80)) {
  42                         // L -> H
  43                         if(register_id != -1) {
  44                                 cancel_event(this, register_id);
  45                                 register_id = -1;
  46                         }
  47                         if(!motor_on) {
  48                                 register_event(this, EVENT_MOTOR_ON, 560000, false, &register_id);
  49                         }
  50                 } else if((prev_dc & 0x80) && !(data & 0x80)) {
  51                         // H -> L
  52                         if(register_id != -1) {
  53                                 cancel_event(this, register_id);
  54                                 register_id = -1;
  55                         }
  56                         if(motor_on) {
  57                                 register_event(this, EVENT_MOTOR_OFF, 1500000, false, &register_id);
  58                         }
  59                 }
  60                 prev_dc = data;
  61                 break;
  62         case 0xdd:
  63                 // side reg
  64                 d_fdc->write_signal(SIG_MB8877_SIDEREG, data, 1);
  65                 break;
  66         case 0xde:
  67                 // ???
  68                 break;
  69         case 0xdf:
  70                 // irq enable
  71                 irq_enabled = ((data & 1) != 0);
  72                 break;
  73         }
  74 }
  75
  76 void FLOPPY::event_callback(int event_id, int err)
  77 {
  78         if(event_id == EVENT_MOTOR_ON) {
  79                 d_fdc->write_signal(SIG_MB8877_MOTOR, 1, 1);
  80                 motor_on = true;
  81         } else if(event_id == EVENT_MOTOR_OFF) {
  82                 d_fdc->write_signal(SIG_MB8877_MOTOR, 0, 0);
  83                 motor_on = false;
  84         }
  85         register_id = -1;
  86 }
  87
  88 void FLOPPY::write_signal(int id, uint32_t data, uint32_t mask)
  89 {
  90         if(id == SIG_FLOPPY_DRQ) {
  91                 if(irq_enabled && (data & mask) != 0) {
  92                         d_cpu->set_intr_line(true, true, 0);
  93                 }
  94         }
  95 }
  96
  97 #define STATE_VERSION   1
  98
  99 bool FLOPPY::process_state(FILEIO* state_fio, bool loading)
 100 {
 101         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
 102                 return false;
 103         }
 104         if(!state_fio->StateCheckInt32(this_device_id)) {
 105                 return false;
 106         }
 107         state_fio->StateUint32(prev_dc);
 108         state_fio->StateInt32(register_id);
 109         state_fio->StateBool(motor_on);
 110         state_fio->StateBool(irq_enabled);
 111         return true;
 112 }