Todo/Mysteries

Where do we read the test pulse output of the uPD4990 ?

Official SNK doc infos

• First 80 bytes of code are switchable through REG_SWPBIOS/REG_SWPROM and switched to the BIOS part on startup ($0~$7F = $C00000~$C0007F)

Registers

• What are $380011, $380061, $380065, $380067, and $3800E1 used for ?

SP-E init code:

	move.b	d0,$380065
	move.b	d0,$380067

• CD registers

Others

• Fix banking with NEO-CMC:

284      if (banked && state->m_fixed_layer_bank_type == 1)
  285      {
  286          int garoubank = 0;
  287          int k = 0;
  288          int y = 0;
  289          while (y < 32)
  290          {
  291              if (state->m_videoram[0x7500 + k] == 0x0200 && (state->m_videoram[0x7580 + k] & 0xff00) == 0xff00)
  292              {
  293                  garoubank = state->m_videoram[0x7580 + k] & 3;
  294                  garouoffsets[y++] = garoubank;
  295              }
  296              garouoffsets[y++] = garoubank;
  297              k += 2;
  298          }
  299      }

• neo-mga on mv1a + PALs, neo-sdr and neo-dcr info
• CDDA playback (needs more research in cd bios)
• neo cd schematics
• dump lc98000 version neocd bios
• fix bankswitching in neo-cmc
• lspc-a0, pro-b0 and pro-c0 pinouts
• How to start page
• LC8953 microcode
• How does the Mahjong controller works ? (SNK doc)