source/src/vm/fmr30/system.cpp

   1 /*
   2         FUJITSU FMR-30 Emulator 'eFMR-30'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2008.12.31 -
   6
   7         [ system ]
   8 */
   9
  10 #include "system.h"
  11
  12 void SYSTEM::initialize()
  13 {
  14         arr = nmistat = 0;
  15         nmimask = 0xf0;
  16 }
  17
  18 void SYSTEM::write_io8(uint32_t addr, uint32_t data)
  19 {
  20         switch(addr & 0xffff) {
  21         case 0x46:
  22                 nmistat &= ~data;
  23                 break;
  24         case 0x47:
  25                 nmimask = data;
  26                 break;
  27         case 0xff00:
  28                 arr = data;
  29                 break;
  30         }
  31 }
  32
  33 uint32_t SYSTEM::read_io8(uint32_t addr)
  34 {
  35         switch(addr & 0xffff) {
  36         case 0x18:
  37                 // modem:       no
  38                 // scsi:        yes
  39                 // fd23:        3.5inch
  40                 // ext-ram:     yes (1mb)
  41                 // co-pro       no
  42                 return 0x24;
  43         case 0x20:
  44         case 0x21:
  45                 // isrr high/low
  46                 return 0;
  47         case 0x46:
  48                 return nmistat;
  49         case 0x47:
  50                 return nmimask;
  51         case 0xff00:
  52                 return arr;
  53         }
  54         return 0xff;
  55 }
  56
  57 #define STATE_VERSION   1
  58
  59 void SYSTEM::save_state(FILEIO* state_fio)
  60 {
  61         state_fio->FputUint32(STATE_VERSION);
  62         state_fio->FputInt32(this_device_id);
  63
  64         state_fio->FputUint8(arr);
  65         state_fio->FputUint8(nmistat);
  66         state_fio->FputUint8(nmimask);
  67 }
  68
  69 bool SYSTEM::load_state(FILEIO* state_fio)
  70 {
  71         if(state_fio->FgetUint32() != STATE_VERSION) {
  72                 return false;
  73         }
  74         if(state_fio->FgetInt32() != this_device_id) {
  75                 return false;
  76         }
  77         arr = state_fio->FgetUint8();
  78         nmistat = state_fio->FgetUint8();
  79         nmimask = state_fio->FgetUint8();
  80         return true;
  81 }
  82