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Address Bus B: Difference between revisions
From SnesLab
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=== See Also === | === See Also === | ||
* [[Address Bus A]] | * [[Address Bus A]] | ||
* [[CPU Data Bus]] | |||
=== Reference === | === Reference === | ||
Revision as of 23:08, 1 August 2023
Address Bus B, also known as the SNES bus, is 8-bits wide on the SNES Motherboard. Its individual address lines are labeled PA0-PA7, which stands for "peripheral address," as in S-CPU peripherals (not SNES peripherals). It is connected to:
- pins 51-58 of the S-CPU
- pins 5-12 of S-PPU1
- pins 17-24 of S-PPU2
- pins 48-51 of S-SMP
- pins 43-50 and 53-54 of WRAM
- pins 28-30 and 59-61, 3 and 34 of the Cartridge Slot
- pins 1-8 of the Expansion Port
It is drawn in purple in the colorized jwdonal schematic. Some people like to think of Address Bus B as being 16-bits wide, with the high byte being fixed to $21.[1]