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Address Bus B: Difference between revisions
From SnesLab
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(pin numbers for the S-SMP) |
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* 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]] | ||
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:
- 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]