Battery-backed RAM: Difference between revisions

From NeoGeo Development Wiki
Jump to navigation Jump to search
mNo edit summary
(Pictures of battery)
 
(8 intermediate revisions by one other user not shown)
Line 1: Line 1:
Battery powered RAM (made non-volatile) used by the [[68k]] to store cab related informations and scores tables in MVS systems, and saves in CD systems.
[[File:Cd2_batram.jpg|thumb|right|8KiB for game saves on a CD1 board.]]


AES systems have [[Memory card]]s instead.
Battery powered RAM (made non-volatile) is used as [[backup RAM]] in the [[MVS]] to store cab related information (bookkeeping) and score tables (sometimes called "SRAM").


==Battery replacement==
The [[:Category:CD systems|CD systems]] use it to store game saves instead of using [[memory card]]s.
NiMh/NiCd, CR2032, charging resistor removal...


[[Category:CPUs]]
Except [[V-Liner]], no game cartridges store player data.
 
[[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=
 
See [[Battery replacement]].
 
 
=Original batteries=
* SAFT come from MV2 and MV4
* Toshiba come from MV1
<gallery>
File:Battery-saft.jpg|thumb|White SAFT battery
File:IMG_20181111_184913.jpg|thumb|Blue SAFT battery
File:Battery-toshiba.jpg|thumb|Toshiba battery
</gallery>
 
 
<gallery>
File:Battery-saft-size.jpg|thumb|White SAFT battery
File:Battery-saft-blue-size.jpg|thumb|Blue SAFT battery
File:Battery-toshiba-size.jpg|thumb|Toshiba battery
</gallery>
 
 
 
[[Category:Chips]]
[[Category:Base system]]

Latest revision as of 20:50, 12 November 2018

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

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

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

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

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.


Original batteries

  • SAFT come from MV2 and MV4
  • Toshiba come from MV1
  • White SAFT battery

    White SAFT battery

  • Blue SAFT battery

    Blue SAFT battery

  • Toshiba battery

    Toshiba battery


  • White SAFT battery

    White SAFT battery

  • Blue SAFT battery

    Blue SAFT battery

  • Toshiba battery

    Toshiba battery

Retrieved from "https://wiki.neogeodev.org/index.php?title=Battery-backed_RAM&oldid=6339"