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Fixed a bug with VGA mask line compare, nw

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This commit is contained in:
Angelo Salese 2012-01-11 21:49:43 +00:00
parent f44cec2da5
commit 65c940ba97
1 changed files with 8 additions and 4 deletions
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12
src/emu/video/pc_vga.c
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@ -1107,15 +1107,19 @@ static void vga_vh_vga(bitmap_t &bitmap)
{
int pos, line, column, c, addr, curr_addr;
UINT16 *bitmapline;
UINT16 mask_comp;
/* line compare is screen sensitive */
mask_comp = 0xff | (LINES & 0x300);
curr_addr = 0;
if(vga.sequencer.data[4] & 0x08)
{
for (addr = VGA_START_ADDRESS, line=0; line<LINES; line++, addr+=VGA_LINE_LENGTH, curr_addr+=VGA_LINE_LENGTH)
{
if(line < (vga.line_compare & 0x3ff))
if(line < (vga.line_compare & mask_comp))
curr_addr = addr;
if(line == (vga.line_compare & 0x3ff))
if(line == (vga.line_compare & mask_comp))
curr_addr = 0;
bitmapline = &bitmap.pix16(line);
addr %= vga.svga_intf.vram_size;
@ -1138,9 +1142,9 @@ static void vga_vh_vga(bitmap_t &bitmap)
{
for (addr = VGA_START_ADDRESS, line=0; line<LINES; line++, addr+=VGA_LINE_LENGTH/4, curr_addr+=VGA_LINE_LENGTH/4)
{
if(line < (vga.line_compare & 0x3ff))
if(line < (vga.line_compare & mask_comp))
curr_addr = addr;
if(line == (vga.line_compare & 0x3ff))
if(line == (vga.line_compare & mask_comp))
curr_addr = 0;
bitmapline = &bitmap.pix16(line);
addr %= vga.svga_intf.vram_size;