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Work RAM
From SnesLab
(Redirected from LowRAM)
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] WRAM is DRAM and as such must be refreshed.
See Also
References
- https://problemkaputt.de/fullsnes.htm#snesmemoryworkramaccess
- https://problemkaputt.de/fullsnes.htm#snescontrollersotherinputs
- page 1 of Book II, "Super NES Parts List" in the official Nintendo development manual
- paragraph 22.3 on page 2-22-1 of Book I, lbid
- caution #11: page 2-24-3 of Book I