source/src/vm/j3100/floppy.cpp

   1 /*
   2         TOSHIBA J-3100GT Emulator 'eJ-3100GT'
   3         TOSHIBA J-3100SL Emulator 'eJ-3100SL'
   4
   5         Author : Takeda.Toshiya
   6         Date   : 2011.08.16-
   7
   8         [ diskette i/f ]
   9 */
  10
  11 #include "floppy.h"
  12 #include "../disk.h"
  13 #include "../upd765a.h"
  14
  15 void FLOPPY::initialize()
  16 {
  17         ctrl_reg = 0;
  18 }
  19
  20 void FLOPPY::reset()
  21 {
  22         for(int i = 0; i < 4; i++) {
  23                 d_fdc->set_drive_type(i, DRIVE_TYPE_2HD);
  24         }
  25 }
  26
  27 void FLOPPY::write_io8(uint32 addr, uint32 data)
  28 {
  29         switch(addr) {
  30         case 0x3f2:
  31                 // bit0-1: select drive
  32                 d_fdc->write_signal(SIG_UPD765A_DRVSEL, data, 3);
  33                 // bit3: reset fdc
  34                 if((ctrl_reg & 4) && !(data & 4)) {
  35                         d_fdc->reset();
  36                 }
  37                 // bit3: enable irq/drq
  38                 d_fdc->write_signal(SIG_UPD765A_IRQ_MASK, !data, 8);
  39                 d_fdc->write_signal(SIG_UPD765A_DRQ_MASK, !data, 8);
  40                 // bit4: fdd #a motor
  41                 // bit5: fdd #b motor
  42                 ctrl_reg = data;
  43                 break;
  44         case 0x3f7:
  45                 switch(data & 3) {
  46                 case 0: // 500kbps (2hd)
  47                         d_fdc->set_drive_type(ctrl_reg & 3, DRIVE_TYPE_2HD);
  48                         break;
  49                 case 1: // 300kbps (2dd)
  50                 case 2: // 250kbps (2dd)
  51                         d_fdc->set_drive_type(ctrl_reg & 3, DRIVE_TYPE_2DD);
  52                         break;
  53                 }
  54                 break;
  55         }
  56 }
  57
  58 uint32 FLOPPY::read_io8(uint32 addr)
  59 {
  60         switch(addr) {
  61         case 0x3f7:
  62                 // bit7: 1=ejected
  63                 return d_fdc->disk_ejected(ctrl_reg & 3) ? 0x8f : 0x0f;
  64         }
  65         return 0xff;
  66 }
  67