source/src/vm/n5200/floppy.cpp

   1 /*
   2         NEC N5200 Emulator 'eN5200'
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2008.06.11 -
   6
   7         [ floppy ]
   8 */
   9
  10 #include "../vm.h"
  11 #include "../../emu.h"
  12 #include "floppy.h"
  13 #include "../i8237.h"
  14
  15 void FLOPPY::reset()
  16 {
  17         chgreg = 3;
  18 }
  19
  20 void FLOPPY::write_io8(uint32_t addr, uint32_t data)
  21 {
  22         switch(addr & 0xffff) {
  23         case 0x92:
  24         case 0xca:
  25 //              if(((addr >> 4) ^ chgreg) & 1) {
  26 //                      break;
  27 //              }
  28                 d_fdc->write_io8(1, data);
  29                 break;
  30         case 0x94:
  31         case 0xcc:
  32 //              if(((addr >> 4) ^ chgreg) & 1) {
  33 //                      break;
  34 //              }
  35                 if((ctrlreg ^ data) & 0x10) {
  36                         // mode chang
  37 //                      fdcstatusreset();
  38 //                      fdc_dmaready(0);
  39 //                      dmac_check();
  40                 }
  41                 ctrlreg = data;
  42                 break;
  43         case 0xbe:
  44                 chgreg = data;
  45                 break;
  46         }
  47 }
  48
  49 uint32_t FLOPPY::read_io8(uint32_t addr)
  50 {
  51         switch(addr & 0xffff) {
  52         case 0x90:
  53         case 0xc8:
  54 //              if(((addr >> 4) ^ chgreg) & 1) {
  55 //                      break;
  56 //              }
  57                 return d_fdc->read_io8(0);
  58         case 0x92:
  59         case 0xca:
  60 //              if(((addr >> 4) ^ chgreg) & 1) {
  61 //                      break;
  62 //              }
  63                 return d_fdc->read_io8(1);
  64         case 0x94:
  65         case 0xcc:
  66 //              if(((addr >> 4) ^ chgreg) & 1) {
  67 //                      break;
  68 //              }
  69                 return (addr & 0x10) ? 0x40 : 0x70;
  70         case 0xbe:
  71                 return (chgreg & 3) | 8;
  72         }
  73         return addr & 0xff;
  74 }
  75
  76 void FLOPPY::write_signal(int id, uint32_t data, uint32_t mask)
  77 {
  78         static const int dma_ids[2] = { SIG_I8237_CH3, SIG_I8237_CH2 };
  79
  80         // drq from fdc
  81         d_dma->write_signal(dma_ids[chgreg & 1], data, mask);
  82 }
  83