source/src/vm/ls244.cpp

   1 /*
   2         Skelton for retropc emulator
   3
   4         Author : Takeda.Toshiya
   5         Date   : 2008.04.19-
   6
   7         [ 74LS244 / 74LS245 ]
   8 */
   9
  10 #include "ls244.h"
  11
  12 void LS244::initialize()
  13 {
  14         DEVICE::initialize();
  15         din = 0xff;
  16 }
  17
  18 void LS244::write_io8(uint32_t addr, uint32_t data)
  19 {
  20         write_signals(&outputs, data);
  21 }
  22
  23 uint32_t LS244::read_io8(uint32_t addr)
  24 {
  25         return din;
  26 }
  27
  28 void LS244::write_signal(int id, uint32_t data, uint32_t mask)
  29 {
  30         din = (din & ~mask) | (data & mask);
  31 }
  32
  33 #define STATE_VERSION   1
  34
  35 bool LS244::process_state(FILEIO* state_fio, bool loading)
  36 {
  37         if(!state_fio->StateCheckUint32(STATE_VERSION)) {
  38                 return false;
  39         }
  40         if(!state_fio->StateCheckInt32(this_device_id)) {
  41                 return false;
  42         }
  43         state_fio->StateUint8(din);
  44         return true;
  45 }
  46