Address Bus A: Difference between revisions

Latest revision as of 19:44, 18 August 2024

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 23-31 and pins 34-42
Cartridge Slot pins 6-17 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.

Reference

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

@@ Line 2: / Line 2: @@
 It is connected to:
-* pins 2-17 and 93-100 of the [[S-CPU]]
+* [[S-CPU]] pins 2-17 and 93-100
-* pins 23-42 of [[WRAM]]
+* [[WRAM]] pins 23-31 and pins 34-42
-* pins 5-17 and 37-48 of the [[Cartridge Slot]]
+* [[Cartridge Slot]] pins 6-17 and 37-48
-It is 24 bits wide because that is how big the SNES' address space is.
+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.
+[[File:Bus A.png|thumb]]
 === See Also ===