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Reged: 01/05/18
Posts: 2
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Re: Problems loading modified roms
01/15/18 02:34 AM

I found the definition for drmarion ROM in src/mame/drivers/vsnes.cpp

ROM_START( drmario )
ROM_REGION( 0x20000,"maincpu", 0 ) /* 6502 memory */
ROM_LOAD( "dm-uiprg", 0x10000, 0x10000, CRC(d5d7eac4) SHA1(cd74c3a7a2fc7c25420037ae5f4a25307aff6587) )

ROM_REGION( 0x8000,"gfx1", 0 ) /* PPU memory */
ROM_LOAD( "dm-u3chr", 0x0000, 0x8000, CRC(91871aa5) SHA1(32a4299ead7b37f49877dc9597653b07a73ddbf3) )


This indicates the rom "region" that I'm interested in (dm-uiprg) has a length of 0x20000. The N2A03 (6502) processor has only 16 bits of address giving it an address space of 0x10000 bytes, so how can the region be twice that size?

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Subject Posted by Posted on
* Problems loading modified roms tallcuss 01/06/18 09:18 AM
. * Re: Problems loading modified roms tallcuss  01/15/18 02:34 AM
. * Re: Problems loading modified roms Haze  01/15/18 07:16 PM

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