1  
 2  #include "shared.h"
 3  
 4  t_vce vce;
 5  
 6  void vce_w(int address, int data)
 7  {
 8      int msb = (address & 1);
 9  
10      switch(address & ~1)
11      {
12          case 0x404: /* Data */
13              {
14                  if(data != vce.data[((vce.addr & 0x1FF) << 1) | (msb)])
15                  {
16                      vce.data[((vce.addr & 0x1FF) << 1) | (msb)] = data;
17  
18                      if((vce.addr & 0x0F) != 0x00)
19                      {
20  //                        uint16 temp = *(uint16 *)&vce.data[(vce.addr << 1)];    // Execute error.
21                          uint8 temp1 = vce.data[(vce.addr << 1)];
22                          uint8 temp2 = vce.data[(vce.addr << 1)+1];
23                          uint16 temp;
24  #ifndef LSB_FIRST
25  //                      temp = (temp >> 8) | (temp << 8);
26                          temp = (((uint16)temp1) << 8) + (uint16)temp2;
27  #else
28                          temp = (((uint16)temp2) << 8) + (uint16)temp1;                      
29  #endif
30                          pixel[(vce.addr >> 8) & 1][(vce.addr & 0xFF)] = pixel_lut[temp];
31                          temp = (temp >> 1) & 0xFF;
32                      }
33  
34                      /* Update overscan color */
35                      if((vce.addr & 0x0F) == 0x00)
36                      {
37                          int n;
38                          uint16 temp = *(uint16 *)&vce.data[0];
39  #ifndef LSB_FIRST
40                          temp = (temp >> 8) | (temp << 8);
41  #endif
42                          for(n = 0; n < 0x10; n += 1)
43                              pixel[0][(n << 4)] = pixel_lut[temp];
44                          temp = (temp >> 1) & 0xFF;                                                
45                      }
46                  }
47              }
48  
49              /* Increment VCE address on access to the MSB data port */
50              if(msb) vce.addr += 1;
51              break;
52  
53          case 0x402: /* Address */
54              if(msb)
55                  vce.addr = (vce.addr & 0x00FF) | ((data & 1) << 8);
56              else
57                  vce.addr = (vce.addr & 0x0100) | (data);
58              break;
59  
60          case 0x0400: /* Control */
61              if(!msb) vce.ctrl = (data & 1);
62              break;
63      }
64  }
65  
66  
67  int vce_r(int address)
68  {
69      int msb = (address & 1);
70  
71      if((address & ~1) == 0x0404)
72      {
73          uint8 temp = vce.data[((vce.addr & 0x1FF) << 1) | (msb)];
74          if(msb) vce.addr += 1;
75          return (temp);
76      }
77  
78      return (0xFF);
79  }