P ROM: Difference between revisions

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[[File:p_rom.jpg|thumb|right|1MiB P1 ROM]]
[[File:p_rom.jpg|thumb|right|1MiB P1 ROM]]
16bit ROM(s) containing byteswapped [[68k]] binaries in [[cartridges]].
16bit ROM(s) containing byteswapped [[68k]] binaries in [[cartridges]].
Minimum speed: 150ns. Can use slower ROMs by using the cartridge's wait state configuration.


Sometimes, two 8 bit ROMs are used as a second P ROM (called "SP1/2" or "EP1/2").
Sometimes, two 8 bit ROMs are used as a second P ROM (called "SP1/2" or "EP1/2").

Revision as of 04:33, 28 October 2015

File:P rom.jpg
1MiB P1 ROM

16bit ROM(s) containing byteswapped 68k binaries in cartridges.

Minimum speed: 150ns. Can use slower ROMs by using the cartridge's wait state configuration.

Sometimes, two 8 bit ROMs are used as a second P ROM (called "SP1/2" or "EP1/2").

When unbanked, the maximum size is 1MiB. Some games use bankswitching to use 2MiB or bigger P ROMs.

Some cartridges use an NGPC flash board soldered in place of the mask ROMs.