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A7800Hawk: Pokey bug fixes

This commit is contained in:
alyosha-tas 2017-08-26 20:58:08 -04:00 committed by GitHub
parent 2c42448e0d
commit a6d036e13c
1 changed files with 7 additions and 8 deletions
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15
BizHawk.Emulation.Cores/Consoles/Atari/A7800Hawk/Pokey.cs
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@ -18,9 +18,6 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
* The registers are write only, except for the RNG none of the things that would return reads are connected * The registers are write only, except for the RNG none of the things that would return reads are connected
* for now return FF * for now return FF
*/ */
public class Pokey public class Pokey
{ {
public A7800Hawk Core { get; set; } public A7800Hawk Core { get; set; }
@ -111,24 +108,24 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
// poly5 output: 1101001100000111001000101011110 // poly5 output: 1101001100000111001000101011110
if ((Regs[0xF] & 3) != 0) if ((Regs[0xF] & 3) != 0)
{ {
bit_xor = ((poly4 >> 3) ^ (poly4 >> 2) ^ poly4) & 1; bit_xor = ((poly4) ^ (poly4 >> 1)) & 1;
poly4 = (poly4 >> 1) | (bit_xor << 3); poly4 = (poly4 >> 1) | (bit_xor << 3);
bit_xor = ((poly5 >> 4) ^ (poly5 >> 2) ^ poly5) & 1; bit_xor = ((poly5 >> 2) ^ poly5) & 1;
poly5 = (poly5 >> 1) | (bit_xor << 4); poly5 = (poly5 >> 1) | (bit_xor << 4);
if (Regs[8].Bit(7)) if (Regs[8].Bit(7))
{ {
// clock only 9 bits of the 17 bit poly // clock only 9 bits of the 17 bit poly
poly9 = poly17 >> 8; poly9 = poly17 >> 8;
bit_xor = ((poly9 >> 8) ^ (poly9 >> 4) ^ poly9) & 1; bit_xor = ((poly9 >> 4) ^ poly9) & 1;
poly9 = (poly9 >> 1) | (bit_xor << 8); poly9 = (poly9 >> 1) | (bit_xor << 8);
poly17 = (poly17 & 0xFF) | (poly9 << 8); poly17 = (poly17 & 0xFF) | (poly9 << 8);
} }
else else
{ {
// clock the whole 17 bit poly // clock the whole 17 bit poly
bit_xor = ((poly17 >> 16) ^ (poly17 >> 13) ^ poly17) & 1; bit_xor = ((poly17 >> 3) ^ poly17) & 1;
poly17 = (poly17 >> 1) | (bit_xor << 16); poly17 = (poly17 >> 1) | (bit_xor << 16);
} }
} }
@ -200,7 +197,8 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
if (clock_ch[i]) if (clock_ch[i])
{ {
ch_div[i]++; ch_div[i]++;
if (ch_div[i] == (Regs[i * 2] + 1))
if (ch_div[i] >= (Regs[i * 2] + 1))
{ {
ch_div[i] = 0; ch_div[i] = 0;
@ -262,6 +260,7 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
{ {
ch_out[i] = poly4.Bit(3); ch_out[i] = poly4.Bit(3);
} }
ch_src[i] = !ch_src[i]; ch_src[i] = !ch_src[i];
} }