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]] | 16bit ROM(s) containing the byteswapped [[68k]] program in [[cartridges]]. | ||
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"). | ||
When | When not banked, the maximum size is [[68k memory map|1MiB]]. Some games use [[bankswitching]] for 2MiB or larger P ROMs. | ||
Some cartridges use an [[NGPC flash board]] soldered in place of the mask ROMs. | Some cartridges use an [[NGPC flash board]] soldered in place of the mask ROMs. | ||
==Speed== | |||
Minimum speed: 150ns. Can use slower ROMs by using the cartridge's [[wait cycle]] configuration. | |||
[[Category:Chips]] | [[Category:Chips]] | ||
[[Category:Cartridge systems]] | [[Category:Cartridge systems]] | ||
Revision as of 04:58, 28 February 2017
16bit ROM(s) containing the byteswapped 68k program in cartridges.
Sometimes, two 8 bit ROMs are used as a second P ROM (called "SP1/2" or "EP1/2").
When not banked, the maximum size is 1MiB. Some games use bankswitching for 2MiB or larger P ROMs.
Some cartridges use an NGPC flash board soldered in place of the mask ROMs.
Speed
Minimum speed: 150ns. Can use slower ROMs by using the cartridge's wait cycle configuration.