source/src/vm/bx1/floppy.cpp

   1 /*
   2         CANON BX-1 Emulator 'eBX-1'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2021.02.14-
   6
   7         [ floppy ]
   8 */
   9
  10 #include "floppy.h"
  11 #include "../mc6843.h"
  12
  13 namespace BX1 {
  14 uint32_t FLOPPY::read_io8(uint32_t addr)
  15 {
  16         uint32_t value = 0xff;
  17
  18         switch(addr & 0xffff) {
  19         case 0xe189:
  20                 value  = d_fdc->is_disk_inserted(0) && d_fdc->is_disk_protected(0) ? 1 : 0;
  21                 value |= d_fdc->is_disk_inserted(1) && d_fdc->is_disk_protected(1) ? 2 : 0;
  22                 break;
  23         default:
  24                 break;
  25         }
  26         return value;
  27 }
  28
  29 void FLOPPY::write_io8(uint32_t addr, uint32_t data)
  30 {
  31         switch(addr & 0xffff) {
  32         case 0xe18a:
  33                 // drive reg
  34                 switch(data & 0x0f) {
  35                 case 0x01:
  36                         d_fdc->write_signal(SIG_MC6843_DRIVEREG, 0, 3);
  37                         break;
  38                 case 0x02:
  39                         d_fdc->write_signal(SIG_MC6843_DRIVEREG, 1, 3);
  40                         break;
  41                 case 0x04:
  42                         d_fdc->write_signal(SIG_MC6843_DRIVEREG, 2, 3);
  43                         break;
  44                 case 0x08:
  45 //                      d_fdc->write_signal(SIG_MC6843_DRIVEREG, 3, 3);
  46                         break;
  47                 }
  48                 break;
  49         case 0xe18c:
  50                 // ??? only clear
  51                 break;
  52         default:
  53                 break;
  54         }
  55 }
  56
  57 }