philyso  

    Combat Commando
    7 posts
    Joined: 26-October 11 

Posted Sun Feb 12, 2012 1:41 PM
I finally had the chance to test Wii-Mednafen and it's actually a very
 good emulator, despite the limited interface. PCE emulation is years 
beyond what we got before, but honestly, I am a huge Genesis fan and I 
cannot let say Mednafen is an improvement compared to Genesis Plus GX, 
it's actually the opposite for me :-)

Games with major graphical glitches: Aladdin, Out Runners, Double Clutch
Games not working or freezing: James Pond 3, Dracula, Fatal Rewind, 
Virtua Racing, a few unlicensed games

Off course, that's not much but there might be others, whereas I more or 
less tested the whole Genesis romset with Genesis Plus GX to get a full 
set of screenshots, and never encountered a single glitch or non-working 
game !

Sound emulation is good but not as accurate as Genesis Plus GX. 
Actually, it's sounds more like Gens while Genesis Plus GX is closer to
 Kega in term of accuracy. That's said, some people always prefered the 
sound of Gens even if it's not correct. Examples of a few games that 
notably sound wrong in Mednafen exactly like in Gens are Scoobi-Doo, 
Flashback (BGM 3 in sound test) or Comix Zone (many BGM in sound test) 
or have wrong sound effects (Alisia Dragoon, Beavis & Butthead, etc).

Product Code: ACLD004 -00
Domestic name:                                                 
Overseas name: TURRICAN                                        
Copyright: (C)ACLD 1991.JUN
Checksum:  0x09fb
 Warning: calculated checksum(0x1bae) does not match
Supported I/O devices:
 3-Button Gamepad
Supported regions:
 Overseas NTSC

md/vdp.cpp
597:
 static const int fill_cc[2][2] =
 {
  { 16, 167 },
  { 18, 205 },
};

>>>>
static const int fill_cc[2][2] =
 {
  { 15, 166 },
  { 17, 204 },
};

610:
  case 0x40: /* V bus to VDP DMA */
	   {
int32 runcount = (vbus_cc[reg[0x0C] & 1][vb_index] + 1) / 2;

>>>>
  case 0x40: /* V bus to VDP DMA */
	   {
int32 runcount = vbus_cc[reg[0x0C] & 1][vb_index];

static const uint8 vc28_pal[313] =
{
        0x00, 0x01, 0x02,    0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
	0x10, 0x11, 0x12,    0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
	0x20, 0x21, 0x22,    0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
	0x30, 0x31, 0x32,    0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
	0x40, 0x41, 0x42,    0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
	0x50, 0x51, 0x52,    0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
	0x60, 0x61, 0x62,    0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
	0x70, 0x71, 0x72,    0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
	0x80, 0x81, 0x82,    0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
	0x90, 0x91, 0x92,    0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
	0xa0, 0xa1, 0xa2,    0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
	0xb0, 0xb1, 0xb2,    0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
	0xc0, 0xc1, 0xc2,    0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
	0xd0, 0xd1, 0xd2,    0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
	0xe0, 0xe1, 0xe2,    0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
	0xf0, 0xf1, 0xf2,    0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
	0x00, 0x01, 0x02,/**/0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6,
	0xd7, 0xd8, 0xd9,    0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6,
	0xe7, 0xe8, 0xe9,    0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6,
        0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
};

https://github.com/mamedev/mame/blob/master/src/devices/video/315_5313.cpp#L1067

	  printf("DMA: %02x, %d, %d\n", reg[23], scanline, DMALength);
            switch(reg[23] & 0xC0)
            {
                
                case 0x00: /* V bus to VDP DMA */
                case 0x40: /* V bus to VDP DMA */
		    if((code & 0x0F) != 0x1 && (code & 0x0F) != 0x3 && (code & 0x0F) != 0x5)
                     MD_DBG(MD_DBG_WARNING, "[VDP] Invalid code for V bus to VDP dma: %02x\n", code);
		    status |= 0x2;
		    Recalc68KSuspend();
                    break;

                case 0x80: /* VRAM fill */
                    if((code & 0x0F) != 0x1)
                     MD_DBG(MD_DBG_WARNING, "[VDP] Invalid code for fill dma: %02x\n", code);
                    dma_fill = 1;
                    break;

                case 0xC0: /* VRAM copy */
                    if((code & 0x0F) != 0x0)
                     MD_DBG(MD_DBG_WARNING, "[VDP] Invalid code for copy dma: %02x\n", code);
		    status |= 0x2;
                    break;
            }
             while(status & 0x2) CheckDMA(); //turbo DMA hack

 while(status & 0x2) CheckDMA(); //turbo DMA hack

T-12056 -00