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Address Bus B: Difference between revisions

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(pin numbers for PPU2)
(pin numbers for the S-SMP)
Line 4: Line 4:
* pins 5-12 of [[S-PPU1]]
* pins 5-12 of [[S-PPU1]]
* pins 17-24 of [[S-PPU2]]
* pins 17-24 of [[S-PPU2]]
* pins 48-51 of [[S-SMP]]
* pins 43-50 and 53-54 of [[WRAM]]
* pins 43-50 and 53-54 of [[WRAM]]
* pins 28-30 and 59-61, 3 and 34 of the [[Cartridge Slot]]
* pins 28-30 and 59-61, 3 and 34 of the [[Cartridge Slot]]
* pins 1-8 of the [[Expansion Port]]
* pins 1-8 of the [[Expansion Port]]
* the [[S-SMP]]


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.<sup>[1]</sup>
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.<sup>[1]</sup>

Revision as of 23:04, 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:

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]

See Also

Reference

  1. https://forums.nesdev.org/viewtopic.php?p=116505#p116505