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 addr, uint32 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 SYSTEM::read_io8(uint32 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