Пример #1
0
  protected void writeAddress(byte val) {
    /* >8C02, address write */

    if (vdpaddrflag) {
      vdpaddr = (vdpaddr & 0xff) | (val << 8);
    } else {
      vdpaddr = (vdpaddr & 0xff00) | (val & 0xff);
    }
    if ((vdpaddrflag = !vdpaddrflag) == false) {
      if (dumpVdpAccess.getBoolean()) {
        PrintWriter pw = Logging.getLog(dumpFullInstructions);
        if (pw != null) pw.println("Address: " + HexUtils.toHex4(vdpaddr));
      }
      if ((vdpaddr & 0x8000) != 0) {
        writeRegAddr(vdpaddr);
        vdpaddr &= 0x3fff;
      } else if ((vdpaddr & 0x4000) != 0) {
        vdpaddr &= 0x3fff;
      } else {
        // read ahead one byte
        vdpreadahead = videoMemory.readByte(vdpaddr);
        autoIncrementAddr();
      }
    }
  }
Пример #2
0
 protected byte readData() {
   /* >8800, memory read */
   byte ret;
   ret = vdpreadahead;
   vdpreadahead = videoMemory.readByte(vdpaddr);
   autoIncrementAddr();
   return ret;
 }