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 bool SYSPORT::process_state(FILEIO* state_fio, bool loading)
  72 {
  73         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
  74                 return false;
  75         }
  76         if(!state_fio->StateCheckInt32(this_device_id)) {
  77                 return false;
  78         }
  79         state_fio->StateInt32(rst);
  80         state_fio->StateInt32(highden);
  81         return true;
  82 }