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Un-marked the 2608 rom as bad, since AFAIK Jarek did test this dump as an external rom and it completely matched the internal rom when played back, digitally compared at the dac input.

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Also re-added comments from the original fm.c version.
It would be best if we can find a 2608 to decap eventually, though. [Lord Nightmare]
This commit is contained in:
Jonathan Gevaryahu 2013-10-27 22:33:07 +00:00
parent e3a24aeb48
commit 4a01707cf3
1 changed files with 30 additions and 2 deletions
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32
src/emu/sound/2608intf.c
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@ -220,8 +220,36 @@ void ym2608_device::device_config_complete()
}
ROM_START( ym2608 )
ROM_REGION( 0x2000, "ym2608", 0 ) // marked as bad dump because it was dumped by output analysis, not decap. data order could be incorrect, see YM2608_ADPCM_ROM_addr table in fm.c for current sample offsets
ROM_LOAD16_WORD( "ym2608_adpcm_rom.bin", 0x0000, 0x2000, BAD_DUMP CRC(23c9e0d8) SHA1(50b6c3e288eaa12ad275d4f323267bb72b0445df) )
ROM_REGION( 0x2000, "ym2608", 0 )
/*
This data is derived from the chip's output - internal ROM can't be read.
It was verified, using real YM2608, that this ADPCM stream produces 100% correct output signal.
*/
// see YM2608_ADPCM_ROM_addr table in fm.c for current sample offsets
// original offset comments from Jarek:
// offset 0:
/* Source: 01BD.ROM */
/* Length: 448 / 0x000001C0 */
// offset 0x1C0:
/* Source: 02SD.ROM */
/* Length: 640 / 0x00000280 */
// offset 0x440:
/* Source: 04TOP.ROM */
/* Length: 5952 / 0x00001740 */
// offset 0x1B80:
/* Source: 08HH.ROM */
/* Length: 384 / 0x00000180 */
// offset 0x1D00
/* Source: 10TOM.ROM */
/* Length: 640 / 0x00000280 */
// offset 0x1F80
/* Source: 20RIM.ROM */
/* Length: 128 / 0x00000080 */
/* while this rom was dumped by output analysis, not decap, it was tested
by playing it back into the chip as an external adpcm sample and produced
an identical dac result. a decap would be nice to verify things 100%,
but there is currently no reason to think this rom dump is incorrect. */
ROM_LOAD16_WORD( "ym2608_adpcm_rom.bin", 0x0000, 0x2000, CRC(23c9e0d8) SHA1(50b6c3e288eaa12ad275d4f323267bb72b0445df) )
ROM_END