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Adjusted the VLM5030 K3 thru K10 coefficients to be based not on reading the K2 rom but based on the index itself <<6 or 7. This makes the games sound much better and explains the very small ram size used for coefficients other than K1 and K2. This needs further investigation and figuring out of the die schematic to settle completely.

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[Lord Nightmare]
This commit is contained in:
Jonathan Gevaryahu 2011-10-17 00:08:11 +00:00
parent 90fcc34e9c
commit 45e7c273db
1 changed files with 21 additions and 17 deletions
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38
src/emu/sound/tms5110r.c
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@ -539,15 +539,14 @@ static const struct tms5100_coeffs tms5220c_coeff =
done by ogoun, plus image stitching done by John McMaster. The organization of
coefficients beyond k2 is derived from work by Tatsuyuki Satoh.
The actual coefficient rom on the chip die has 5 groups of bits only:
Address | K1A | K1B | K2+ | Energy | Pitch |
Decoder | K1A | K1B | K2+ | Energy | Pitch |
K1A, K1B and K2+ are 10 bits wide, 32 bits long each.
Address | K1A | K1B | K2 | Energy | Pitch |
Decoder | K1A | K1B | K2 | Energy | Pitch |
K1A, K1B and K2 are 10 bits wide, 32 bits long each.
Energy and pitch are both 7 bits wide, 32 bits long each.
K1A holds odd values of K1, K1B holds even values.
K2+ holds values for K2 directly, and K3 and K4 use every other value,
and K5-K10 use every 4th value. Values with the MSB of their index set add an additional
1 or 3 to the index looked up.
(Not sure how this actually works, the logic driving it is a bit of a mess).
K2 holds values for K2 only
K3 and K4 are actually the table index values <<6
K5 thru K10 are actually the table index values <<7
TODO: Current implementation is a bit of a guess, be warned!
*/
static const struct tms5100_coeffs vlm5030_coeff =
@ -586,23 +585,28 @@ static const struct tms5100_coeffs vlm5030_coeff =
0,-510,-502,-490,-473,-452,-426,-396, /* entry 16(0x10) has some special function, purpose unknown */
-362,-325,-284,-241,-196,-149,-100, -50 },
/* K3 */
{ 0, 100, 196, 284, 362, 426, 473, 502,
-510,-490,-452,-396,-325,-241,-149, -50 },
/*{ 0, 100, 196, 284, 362, 426, 473, 502,
-510,-490,-452,-396,-325,-241,-149, -50 },*/
{ 0, 64, 128, 192, 256, 320, 384, 448,
-512,-448,-384,-320,-256,-192,-128, -64 },
/* K4 */
{ 0, 100, 196, 284, 362, 426, 473, 502,
-510,-490,-452,-396,-325,-241,-149, -50 },
/*{ 0, 100, 196, 284, 362, 426, 473, 502,
-510,-490,-452,-396,-325,-241,-149, -50 },*/
{ 0, 64, 128, 192, 256, 320, 384, 448,
-512,-448,-384,-320,-256,-192,-128, -64 },
/* K5 */
{ 0, 196, 362, 473,-510,-452,-325,-149 },
{ 0, 128, 256, 384,-512,-384,-256,-128 },
/* K6 */
{ 0, 196, 362, 473,-510,-452,-325,-149 },
{ 0, 128, 256, 384,-512,-384,-256,-128 },
/* K7 */
{ 0, 196, 362, 473,-510,-452,-325,-149 },
{ 0, 128, 256, 384,-512,-384,-256,-128 },
/* K8 */
{ 0, 196, 362, 473,-510,-452,-325,-149 },
{ 0, 128, 256, 384,-512,-384,-256,-128 },
/* K9 */
{ 0, 196, 362, 473,-510,-452,-325,-149 },
{ 0, 128, 256, 384,-512,-384,-256,-128 },
/* K10 */
{ 0, 196, 362, 473,-510,-452,-325,-149 },
/*{ 0, 196, 362, 473,-510,-452,-325,-149 },*/
{ 0, 128, 256, 384,-512,-384,-256,-128 },
},
/* Chirp table */
{ 0, 42, -44, 50, -78, 18, 37, 20,