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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
* for now return FF
*/
public class Pokey
{
public A7800Hawk Core { get; set; }
@ -111,24 +108,24 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
// poly5 output: 1101001100000111001000101011110
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);
bit_xor = ((poly5 >> 4) ^ (poly5 >> 2) ^ poly5) & 1;
bit_xor = ((poly5 >> 2) ^ poly5) & 1;
poly5 = (poly5 >> 1) | (bit_xor << 4);
if (Regs[8].Bit(7))
{
// clock only 9 bits of the 17 bit poly
poly9 = poly17 >> 8;
bit_xor = ((poly9 >> 8) ^ (poly9 >> 4) ^ poly9) & 1;
bit_xor = ((poly9 >> 4) ^ poly9) & 1;
poly9 = (poly9 >> 1) | (bit_xor << 8);
poly17 = (poly17 & 0xFF) | (poly9 << 8);
}
else
{
// 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);
}
}
@ -200,7 +197,8 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
if (clock_ch[i])
{
ch_div[i]++;
if (ch_div[i] == (Regs[i * 2] + 1))
if (ch_div[i] >= (Regs[i * 2] + 1))
{
ch_div[i] = 0;
@ -262,6 +260,7 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
{
ch_out[i] = poly4.Bit(3);
}
ch_src[i] = !ch_src[i];
}