Address Bus A

Address Bus A is a 24-bit bus on the SNES. It is drawn in orange in the colorized jwdonal schematic, and its individual address lines are labeled CA0-CA23.

It is connected to:

• S-CPU pins 2-17 and 93-100
• WRAM pins 23-42
• Cartridge Slot pins 5-17 and 37-48

It is 24 bits wide because that is how big the SNES' address space is. It can address up to 16 megabytes, which is enough for most games, but some games use bank switching to address even more.

See Also

• Address Bus B
• CPU Data Bus

Reference

1. Figure 2-22-1, "Super NES Functional Block Diagram" on page 2-22-2 of Book I