P bus

The P bus is a 24-bit internal graphics data bus, connecting the video-related chips and the C and S ROM address latches in cartridges.

It carries multiplexed data, which is sequenced by LSPC in a precise and repetitive manner.

C and S ROM adresses are extracted in cartridges by or regular 273's thanks to the  and  signals.

=Values=

Note that C A4 and S A3  are separate signals.

Also note that the X sprite position is only 8 bit since the line buffers are odd/even interleaved. LSPC outputs 2 different latch signals.