Work RAM

The WRAM chip is straddling regions C1 and D1 in the jwdonal schematic

WRAM (Work RAM) serves as the SNES' main memory. It is 128K x 8 bits (131,072 bytes) in size, which is exactly two banks. It has part number 21326. ^[3]

Even though WRAM has both Address Bus A and Address Bus B connected to it, the chip can only pay attention to one at a time, so WRAM-to-WRAM DMA isn't possible.

WRAM is left intact by a Reset. ^[2] But, Nintendo still recommendeds checking to make sure the contents are correct after a reset. ^[5]

See Also

• ARAM
• VRAM
• OAM

References

1. https://problemkaputt.de/fullsnes.htm#snesmemoryworkramaccess
2. https://problemkaputt.de/fullsnes.htm#snescontrollersotherinputs
3. page 1 of Book II, "Super NES Parts List" in the official Nintendo development manual
4. page 2-22-1 of Book II, lbid
5. caution #11: page 2-24-3 of Book I