Signals

Most names come from the official schematics.

Some help to decipher the names:
 * / means the signal is active low.
 * OE means Output Enable.
 * U is used for Upper (even) byte.
 * L is used for Lower (odd) byte.
 * B as suffix often means the signal is inverted.

=Clocks=

=68k CPU=

=Graphics=


 * PCK1B: Low 55ns, high 610 (1.5MHz) Clock to latch C ROM address from P0~P23 (mapping) on rising edge.
 * PCK2B: Low 55ns, high 610 (1.5MHz) Clock to latch S ROM address from P0~P15 (mapping) on rising edge.

=Misc.=


 * SYSTEM: low when onboard ROMs selected
 * SYSTEMB: inverted SYSTEM

=Z80 CPU=


 * SDA0~SDA15 : Z80 address bus
 * SDD0~SDD7: Z80 data bus

=Sound=


 * SDRAD0~SDRAD7: ADPCM-A ROM multiplexed bus (data/address)
 * SDRA8,SDRA9,SDRA20~SDRA23: ADPCM-A ROM address bus
 * SDPAD0~SDPAD7: ADPCM-B ROM multiplexed bus (data/address)
 * SDPA8,SDPA9,SDPA10,SDPA11: ADPCM-B ROM address bus