source/src/vm/mz5500/sysport.cpp

   1 /*
   2         SHARP MZ-5500 Emulator 'EmuZ-5500'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2008.04.10 -
   6
   7         [ system port ]
   8 */
   9
  10 #include "sysport.h"
  11
  12 void SYSPORT::initialize()
  13 {
  14         rst = 0;
  15         register_frame_event(this);
  16 }
  17
  18 void SYSPORT::write_io8(uint32_t addr, uint32_t data)
  19 {
  20         switch(addr & 0x3f0) {
  21         case 0x70:
  22                 // port-c
  23                 if(data & 8) {
  24                         d_fdc->reset();
  25                 }
  26 #if defined(_MZ6500) || defined(_MZ6550)
  27                 highden = data & 4;
  28 #endif
  29                 break;
  30         case 0x260:
  31                 // z80ctc reti
  32                 if(data == 0x4d) {
  33                         d_ctc->notify_intr_reti();
  34                 }
  35                 break;
  36         }
  37 }
  38
  39 uint32_t SYSPORT::read_io8(uint32_t addr)
  40 {
  41         switch(addr & 0x3ff) {
  42         case 0x60:
  43                 // port-a
  44 #if defined(_MZ6500) || defined(_MZ6550)
  45                 return 0xfc | (rst ? 0 : 2) | (highden ? 1 : 0);
  46 #else
  47                 return 0xfd | (rst ? 0 : 2);
  48 #endif
  49         case 0x240:
  50                 // z80ctc vector
  51                 return d_ctc->get_intr_ack();
  52         case 0x250:
  53                 // z80sio vector
  54                 return d_sio->get_intr_ack();
  55         case 0x270:
  56                 // port-b
  57                 return 0xff;
  58         }
  59         return 0xff;
  60 }
  61
  62 void SYSPORT::event_frame()
  63 {
  64         if(rst) {
  65                 rst--;
  66         }
  67 }
  68
  69 #define STATE_VERSION   1
  70
  71 #include "../../statesub.h"
  72
  73 void SYSPORT::decl_state()
  74 {
  75
  76         enter_decl_state(STATE_VERSION);
  77
  78         DECL_STATE_ENTRY_INT32(rst);
  79         DECL_STATE_ENTRY_INT32(highden);
  80
  81         leave_decl_state();
  82 }
  83
  84 void SYSPORT::save_state(FILEIO* state_fio)
  85 {
  86         if(state_entry != NULL) {
  87                 state_entry->save_state(state_fio);
  88         }
  89 //      state_fio->FputUint32(STATE_VERSION);
  90 //      state_fio->FputInt32(this_device_id);
  91
  92 //      state_fio->FputInt32(rst);
  93 //      state_fio->FputInt32(highden);
  94 }
  95
  96 bool SYSPORT::load_state(FILEIO* state_fio)
  97 {
  98         bool mb = false;
  99         if(state_entry != NULL) {
 100                 mb = state_entry->load_state(state_fio);
 101         }
 102         if(!mb) {
 103                 return false;
 104         }
 105 //      if(state_fio->FgetUint32() != STATE_VERSION) {
 106 //              return false;
 107 //      }
 108 //      if(state_fio->FgetInt32() != this_device_id) {
 109 //              return false;
 110 //      }
 111 //      rst = state_fio->FgetInt32();
 112 //      highden = state_fio->FgetInt32();
 113         return true;
 114 }
 115