68k user RAM: Difference between revisions
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The range from $10F300 to $10FFFF is used by the [[BIOSes|BIOS]] functions and shouldn't be used as regular work RAM. | The range from $10F300 to $10FFFF is used by the [[BIOSes|BIOS]] functions and shouldn't be used as regular work RAM. | ||
In [[CD systems]], the 68k's RAM is used in the same way, but is located in part of the program [[DRAM]] instead of in separate static RAM chips (?). | In [[:Category:CD systems|CD systems]], the 68k's RAM is used in the same way, but is located in part of the program [[DRAM]] instead of in separate static RAM chips (?). | ||
Is it always cleared out by the BIOS ? | |||
==Z80 user RAM== | ==Z80 user RAM== | ||
2KiB mapped in the [[Z80]]'s memory space, from $F800 to $FFFF. | 2KiB mapped in the [[Z80]]'s memory space, from $F800 to $FFFF. Not automatically cleared. | ||
[[Category:CPUs]] | [[Category:CPUs]] | ||
Revision as of 08:02, 19 April 2011
Sometimes called "work RAM".
68k user RAM
64KiB mapped in the 68k's memory space, from $100000 to $10FFFF (mirrored up to $1FFFFF on cartridge systems.
The range from $10F300 to $10FFFF is used by the BIOS functions and shouldn't be used as regular work RAM.
In CD systems, the 68k's RAM is used in the same way, but is located in part of the program DRAM instead of in separate static RAM chips (?).
Is it always cleared out by the BIOS ?
Z80 user RAM
2KiB mapped in the Z80's memory space, from $F800 to $FFFF. Not automatically cleared.