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A7800: BG color and read mode latching

This commit is contained in:
alyosha-tas 2018-11-22 18:31:54 -06:00
parent 2891f501df
commit d8ec5df92d
1 changed files with 9 additions and 2 deletions
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11
BizHawk.Emulation.Cores/Consoles/Atari/A7800Hawk/Maria.cs
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@ -79,6 +79,7 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
int temp_bit_0;
int temp_bit_1;
int disp_mode;
byte BG_latch_1;
int pixel;
// each frame contains 263 scanlines
@ -210,7 +211,13 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
{
pixel = cycle - 133;
local_GFX_index = (GFX_index == 1) ? 0 : 1; // whatever the current index is, we use the opposite
disp_mode = Core.Maria_regs[0x1C] & 0x3;
if (cycle == 133)
{
disp_mode = Core.Maria_regs[0x1C] & 0x3;
BG_latch_1 = Core.Maria_regs[0];
}
color = line_ram[local_GFX_index, pixel];
@ -261,7 +268,7 @@ namespace BizHawk.Emulation.Cores.Atari.A7800Hawk
}
else
{
scanline_buffer[pixel] = _palette[Core.Maria_regs[0x00]];
scanline_buffer[pixel] = _palette[BG_latch_1];
}
// send buffer to the video buffer