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Address Bus B: Difference between revisions
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'''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: | '''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 51-58 of the [[S-CPU]] | ||
| Line 9: | Line 9: | ||
* [[S-PPU2]] | * [[S-PPU2]] | ||
It is drawn in purple in the colorized [[jwdonal schematic]]. | 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> | ||
=== See Also === | === See Also === | ||
* [[Address Bus A]] | * [[Address Bus A]] | ||
=== Reference === | |||
# https://forums.nesdev.org/viewtopic.php?p=116505#p116505 | |||
[[Category:SNES Hardware]] | [[Category:SNES Hardware]] | ||
[[Category:Traces]] | [[Category:Traces]] | ||
[[Category:Buses]] | [[Category:Buses]] | ||
Revision as of 22:40, 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 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
- the S-SMP
- S-PPU2
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]