Battery-backed RAM: Difference between revisions

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[[File:Cd2_batram.jpg|thumb|right|8KiB for game saves on a CD1 board.]]
[[File:Cd2_batram.jpg|thumb|right|8KiB for game saves on a CD1 board.]]


Battery powered RAM (made non-volatile) used to store cab related information (bookkeeping) and score tables in [[MVS systems]], called [[backup RAM]] in this case.
Battery powered RAM (made non-volatile) used to store cab related information (bookkeeping) and score tables in the [[MVS]]. It may be called [[backup RAM]] or sometimes "SRAM".
 
Except [[V-Liner]], no game cartridges store player data.


The [[:Category:CD systems|CD systems]] use it to store game saves instead of using [[memory card]]s.
The [[:Category:CD systems|CD systems]] use it to store game saves instead of using [[memory card]]s.


[[BIOS calls|BIOS calls]] are used to handle the specific save format, although read/writes can be freely done by the game's [[68k]] program.
[[BIOS calls|BIOS calls]] are used to handle the specific formats, although nothing prevents read/writes being done the game's [[68k]] program itself.


=Battery replacement=
=Battery replacement=


NiMh/NiCd, CR2032, charging resistor removal...
See [[Battery replacement]].


[[Category:Chips]]
[[Category:Chips]]
[[Category:Base system]]
[[Category:Base system]]

Revision as of 02:31, 21 October 2017

File:Cd2 batram.jpg
8KiB for game saves on a CD1 board.

Battery powered RAM (made non-volatile) used to store cab related information (bookkeeping) and score tables in the MVS. It may be called backup RAM or sometimes "SRAM".

Except V-Liner, no game cartridges store player data.

The CD systems use it to store game saves instead of using memory cards.

BIOS calls are used to handle the specific formats, although nothing prevents read/writes being done the game's 68k program itself.

Battery replacement

See Battery replacement.