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Inter-PPU Bus
From SnesLab

The Inter-PPU Bus connects S-PPU1 and S-PPU2 together. It is not connected to anything else. The trace names are:
- CHR3
- CHR2
- CHR1
- CHR0
- PRIO1
- PRIO0
- COLOR2
- COLOR1
- COLOR0
- /VCLD
- /HCLD
- FIELD
- /OVER
- /5MIN - 5 MHz In
- /5MOUT - 5 MHz Out