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Reged: 09/21/03
Posts: 6797
Loc: southern CA, US
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Re: bad dump's?
09/06/17 04:40 PM

>today i was playing some cps1 games and when loaded i encountered this message with some
>games. One or more roms/chds have not been correctly dumped. What does that means?

Others already explained, but just for extra detail to mention some of the pcbs might have parts that the contributor might not have a specific adapter to handle extracting data/reading from a particular component.

>games like mercs....have that message

Using Mercs as an example.....


ROM_REGION( 0x0200, "cboardplds", 0 )
ROM_LOAD( "c628", 0x0000, 0x0117, NO_DUMP )

ROM_REGION( 0x0200, "bboardplds", 0 )
ROM_LOAD( "o222b.1a", 0x0000, 0x0117, NO_DUMP )
ROM_LOAD( "lwio.12e", 0x0000, 0x0117, CRC(ad52b90c) ) // pal verification required

ROM_REGION( 0x0200, "cboardplds", 0 )
ROM_LOAD( "c628", 0x0000, 0x0117, NO_DUMP )

some pcbs might have GALs or pals that a contributor might not have a specific reader to handle reading data from the component. In fact some are protected and not really readable whatsoever. As already mentioned, these are out of the hands of most users unless someone actually does have a pcb and can send to someone that has equipment that can read the data.

Over the past ten years a number of the Cps1 pcbs have been redone in which there have been a lot of rom fix updates and more pal and gal components being read so the cps1 emulation progress has improved a fair amount.

Entire thread
Subject Posted by Posted on
* bad dump's? ArcadeG 09/06/17 01:33 AM
. * Re: bad dump's? gregf  09/06/17 04:40 PM
. * Re: bad dump's? MooglyGuy  09/06/17 07:13 AM
. * Re: bad dump's? B2K24  09/06/17 03:12 AM
. * Re: bad dump's? Master O  09/06/17 01:52 AM

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