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 namespace J3100 {
  16
  17 void FLOPPY::initialize()
  18 {
  19         ctrl_reg = 0;
  20 }
  21
  22 void FLOPPY::reset()
  23 {
  24         for(int i = 0; i < 4; i++) {
  25                 d_fdc->set_drive_type(i, DRIVE_TYPE_2HD);
  26         }
  27 }
  28
  29 void FLOPPY::write_io8(uint32_t addr, uint32_t data)
  30 {
  31         switch(addr) {
  32         case 0x3f2:
  33                 // bit0-1: select drive
  34                 d_fdc->write_signal(SIG_UPD765A_DRVSEL, data, 3);
  35                 // bit3: reset fdc
  36                 if((ctrl_reg & 4) && !(data & 4)) {
  37                         d_fdc->reset();
  38                 }
  39                 // bit3: enable irq/drq
  40                 d_fdc->write_signal(SIG_UPD765A_IRQ_MASK, !data, 8);
  41                 d_fdc->write_signal(SIG_UPD765A_DRQ_MASK, !data, 8);
  42                 // bit4: fdd #a motor
  43                 // bit5: fdd #b motor
  44                 ctrl_reg = data;
  45                 break;
  46         case 0x3f7:
  47                 switch(data & 3) {
  48                 case 0: // 500kbps (2hd)
  49                         d_fdc->set_drive_type(ctrl_reg & 3, DRIVE_TYPE_2HD);
  50                         break;
  51                 case 1: // 300kbps (2dd)
  52                 case 2: // 250kbps (2dd)
  53                         d_fdc->set_drive_type(ctrl_reg & 3, DRIVE_TYPE_2DD);
  54                         break;
  55                 }
  56                 break;
  57         }
  58 }
  59
  60 uint32_t FLOPPY::read_io8(uint32_t addr)
  61 {
  62         switch(addr) {
  63         case 0x3f7:
  64                 // bit7: 1=ejected
  65                 return d_fdc->disk_ejected(ctrl_reg & 3) ? 0x8f : 0x0f;
  66         }
  67         return 0xff;
  68 }
  69
  70 }