Todo/Mysteries

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Revision as of 21:07, 13 August 2012 by Furrtek (talk | contribs)
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Rename palette ram bus in NEO-G0 by PC0~PC15 (see schematics page 3).

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)