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 #include "../../fileio.h"
  12
  13 void SYSPORT::initialize()
  14 {
  15         rst = 0;
  16         register_frame_event(this);
  17 }
  18
  19 void SYSPORT::write_io8(uint32 addr, uint32 data)
  20 {
  21         switch(addr & 0x3f0) {
  22         case 0x70:
  23                 // port-c
  24                 if(data & 8) {
  25                         d_fdc->reset();
  26                 }
  27 #if defined(_MZ6500) || defined(_MZ6550)
  28                 highden = data & 4;
  29 #endif
  30                 break;
  31         case 0x260:
  32                 // z80ctc reti
  33                 if(data == 0x4d) {
  34                         d_ctc->intr_reti();
  35                 }
  36                 break;
  37         }
  38 }
  39
  40 uint32 SYSPORT::read_io8(uint32 addr)
  41 {
  42         switch(addr & 0x3ff) {
  43         case 0x60:
  44                 // port-a
  45 #if defined(_MZ6500) || defined(_MZ6550)
  46                 return 0xfc | (rst ? 0 : 2) | (highden ? 1 : 0);
  47 #else
  48                 return 0xfd | (rst ? 0 : 2);
  49 #endif
  50         case 0x240:
  51                 // z80ctc vector
  52                 return d_ctc->intr_ack();
  53         case 0x250:
  54                 // z80sio vector
  55                 return d_sio->intr_ack();
  56         case 0x270:
  57                 // port-b
  58                 return 0xff;
  59         }
  60         return 0xff;
  61 }
  62
  63 void SYSPORT::event_frame()
  64 {
  65         if(rst) {
  66                 rst--;
  67         }
  68 }
  69
  70 #define STATE_VERSION   1
  71
  72 void SYSPORT::save_state(FILEIO* state_fio)
  73 {
  74         state_fio->FputUint32(STATE_VERSION);
  75         state_fio->FputInt32(this_device_id);
  76
  77         state_fio->FputInt32(rst);
  78         state_fio->FputInt32(highden);
  79 }
  80
  81 bool SYSPORT::load_state(FILEIO* state_fio)
  82 {
  83         if(state_fio->FgetUint32() != STATE_VERSION) {
  84                 return false;
  85         }
  86         if(state_fio->FgetInt32() != this_device_id) {
  87                 return false;
  88         }
  89         rst = state_fio->FgetInt32();
  90         highden = state_fio->FgetInt32();
  91         return true;
  92 }
  93