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 namespace MZ5500 {
  13
  14 void SYSPORT::initialize()
  15 {
  16         rst = 0;
  17         register_frame_event(this);
  18 }
  19
  20 void SYSPORT::write_io8(uint32_t addr, uint32_t data)
  21 {
  22         switch(addr & 0x3f0) {
  23         case 0x70:
  24                 // port-c
  25                 if(data & 8) {
  26                         d_fdc->reset();
  27                 }
  28 #if defined(_MZ6500) || defined(_MZ6550)
  29                 highden = data & 4;
  30 #endif
  31                 break;
  32         case 0x260:
  33                 // z80ctc reti
  34                 if(data == 0x4d) {
  35                         d_ctc->notify_intr_reti();
  36                 }
  37                 break;
  38         }
  39 }
  40
  41 uint32_t SYSPORT::read_io8(uint32_t addr)
  42 {
  43         switch(addr & 0x3ff) {
  44         case 0x60:
  45                 // port-a
  46 #if defined(_MZ6500) || defined(_MZ6550)
  47                 return 0xfc | (rst ? 0 : 2) | (highden ? 1 : 0);
  48 #else
  49                 return 0xfd | (rst ? 0 : 2);
  50 #endif
  51         case 0x240:
  52                 // z80ctc vector
  53                 return d_ctc->get_intr_ack();
  54         case 0x250:
  55                 // z80sio vector
  56                 return d_sio->get_intr_ack();
  57         case 0x270:
  58                 // port-b
  59                 return 0xff;
  60         }
  61         return 0xff;
  62 }
  63
  64 void SYSPORT::event_frame()
  65 {
  66         if(rst) {
  67                 rst--;
  68         }
  69 }
  70
  71 #define STATE_VERSION   1
  72
  73 bool SYSPORT::process_state(FILEIO* state_fio, bool loading)
  74 {
  75         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
  76                 return false;
  77         }
  78         if(!state_fio->StateCheckInt32(this_device_id)) {
  79                 return false;
  80         }
  81         state_fio->StateInt32(rst);
  82         state_fio->StateInt32(highden);
  83         return true;
  84 }
  85
  86 }