sram noob?

For anything related to cart (SRAM, SF2 mapper, audio, CD mode 1, ...)

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sigflup
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sram noob?

Postby sigflup » Wed Feb 15, 2017 3:05 am

In regards to sram, I don't understand. Where's the write strobe on the cartridge pinout? I am not seeing it

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Re: sram noob?

Postby TmEE co.(TM) » Wed Feb 15, 2017 3:15 am

There isn't any, you got to do manual address decode. Normally top 2MBytes are used as SRAM range while bottom 2 are ROM range. Games larger than 2MB have a banker that allows top 2MB to be ROM or SRAM depending on last value written to !TIME range.

EDIT: Write strobes are !LWR and !UWR, pins B28 and B29 and !TIME is B31
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