source/src/vm/pasopia7/rampac2.cpp

   1 /*
   2         TOSHIBA PASOPIA Emulator 'EmuPIA'
   3         TOSHIBA PASOPIA 7 Emulator 'EmuPIA7'
   4
   5         Author : Takeda.Toshiya
   6         Date   : 2006.09.20 -
   7
   8         [ ram pac 2 (32kbytes) ]
   9 */
  10
  11 #include "rampac2.h"
  12
  13 static const uint8_t header[16] = {
  14         0xaa, 0x1f, 0x04, 0x00, 0x04, 0x80, 0x00, 0x01, 0x04, 0x04, 0x01, 0x03, 0x08, 0x00, 0x00, 0x00
  15 };
  16
  17 void RAMPAC2::initialize(int id)
  18 {
  19         opened = modified = false;
  20
  21         // note: rampac2 id must be 1 or 2 !!!
  22         if(_tcscmp(config.recent_binary_path[id - 1][0], _T("")) != 0) {
  23                 // open last file
  24                 open_file(config.recent_binary_path[id - 1][0]);
  25         } else {
  26                 // open default rampac2 file
  27                 open_file(create_local_path(_T("RAMPAC%d.BIN"), id));
  28         }
  29 }
  30
  31 void RAMPAC2::release()
  32 {
  33         // save modified data
  34         if(opened && modified) {
  35                 FILEIO* fio = new FILEIO();
  36                 if(fio->Fopen(path, FILEIO_WRITE_BINARY)) {
  37                         fio->Fwrite(ram, sizeof(ram), 1);
  38                         fio->Fclose();
  39                 }
  40                 delete fio;
  41         }
  42 }
  43
  44 void RAMPAC2::reset()
  45 {
  46         ptr = 0;
  47 }
  48
  49 void RAMPAC2::write_io8(uint32_t addr, uint32_t data)
  50 {
  51         switch(addr & 0xff) {
  52         case 0x18:
  53                 ptr = (ptr & 0x7f00) | data;
  54                 break;
  55         case 0x19:
  56                 ptr = (ptr & 0x00ff) | ((data & 0x7f) << 8);
  57                 break;
  58         case 0x1a:
  59                 if(ram[ptr & 0x7fff] != data) {
  60                         modified = true;
  61                 }
  62                 ram[ptr & 0x7fff] = data;
  63                 break;
  64         }
  65 }
  66
  67 uint32_t RAMPAC2::read_io8(uint32_t addr)
  68 {
  69         return ram[ptr & 0x7fff];
  70 }
  71
  72 void RAMPAC2::open_file(const _TCHAR* file_path)
  73 {
  74         // save modified data
  75         release();
  76
  77         // load specified file
  78         FILEIO* fio = new FILEIO();
  79         if(fio->Fopen(file_path, FILEIO_READ_BINARY)) {
  80                 fio->Fread(ram, sizeof(ram), 1);
  81                 fio->Fclose();
  82         } else {
  83                 // initialize formatted image
  84                 memset(ram, 0, sizeof(ram));
  85                 memcpy(ram, header, sizeof(header));
  86                 memset(ram + 0x20, 0xff, 0x200);
  87                 memset(ram + 0x300, 0xfe, 0x004);
  88                 memset(ram + 0x304, 0xff, 0x0fc);
  89         }
  90         delete fio;
  91
  92         my_tcscpy_s(path, _MAX_PATH, file_path);
  93         opened = true;
  94         modified = false;
  95 }
  96
  97 #define STATE_VERSION   1
  98
  99 bool RAMPAC2::process_state(FILEIO* state_fio, bool loading)
 100 {
 101         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
 102                 return false;
 103         }
 104         state_fio->StateBuffer(ram, sizeof(ram), 1);
 105         state_fio->StateUint32(ptr);
 106         state_fio->StateBool(opened);
 107         state_fio->StateBool(modified);
 108         return true;
 109 }