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Merge pull request #4484 from antoinemine/master

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[thomson] added undocumented video mode
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ajrhacker 2019-01-07 07:21:04 -05:00 committed by GitHub
commit d84f01e388
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3 changed files with 46 additions and 3 deletions
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5
src/mame/includes/thomson.h
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@ -181,6 +181,7 @@ public:
void overlay_scandraw_16( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
void overlayhalf_scandraw_16( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
void overlay3_scandraw_16( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
void bitmap16alt_scandraw_16( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
void to770_scandraw_8( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
void mo5_scandraw_8( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
void mo5alt_scandraw_8( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
@ -196,6 +197,7 @@ public:
void overlay_scandraw_8( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
void overlayhalf_scandraw_8( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
void overlay3_scandraw_8( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
void bitmap16alt_scandraw_8( uint8_t* vram, uint16_t* dst, uint16_t* pal, int org, int len );
private:
DECLARE_FLOPPY_FORMATS(cd90_640_formats);
@ -690,7 +692,8 @@ private:
#define THOM_VMODE_BITMAP4_ALT_HALF 12
#define THOM_VMODE_MO5_ALT 13
#define THOM_VMODE_OVERLAY_HALF 14
#define THOM_VMODE_NB 15
#define THOM_VMODE_BITMAP16_ALT 15
#define THOM_VMODE_NB 16
class to7_io_line_device : public device_t

3
src/mame/machine/thomson.cpp
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@ -1743,6 +1743,9 @@ void thomson_state::to9_set_video_mode( uint8_t data, int style )
case 0x3f: thom_set_video_mode( THOM_VMODE_OVERLAY3 ); break;
// undocumented variant enconding for bitmap16
case 0x5b: thom_set_video_mode( THOM_VMODE_BITMAP16_ALT ); break;
default:
logerror( "to9_set_video_mode: unknown mode $%02X tr=%i phi=%i mod=%i\n", data, (data >> 5) & 3, (data >> 3) & 2, data & 7 );
}

37
src/mame/video/thomson.cpp
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@ -568,6 +568,42 @@ UPDATE_LOW( bitmap16 )
END_UPDATE
/* 160x200, 16-colors, no constraint, alternate encoding, undocumented, tested */
static const unsigned tbl_bit16[4][4] = {
{ 0, 2, 8, 10 },
{ 1, 3, 9, 11 },
{ 4, 6, 12, 14 },
{ 5, 7, 13, 15 }
};
UPDATE_HI( bitmap16alt )
{
unsigned p0 = tbl_bit16[ramb >> 6][rama >> 6];
unsigned p1 = tbl_bit16[(ramb >> 4) & 3][(rama >> 4) & 3];
unsigned p2 = tbl_bit16[(ramb >> 2) & 3][(rama >> 2) & 3];
unsigned p3 = tbl_bit16[ramb & 3][rama & 3];
dst[ 0] = dst[ 1] = dst[ 2] = dst[ 3] = pal[ p0 ];
dst[ 4] = dst[ 5] = dst[ 6] = dst[ 7] = pal[ p1 ];
dst[ 8] = dst[ 9] = dst[10] = dst[11] = pal[ p2 ];
dst[12] = dst[13] = dst[14] = dst[15] = pal[ p3 ];
}
END_UPDATE
UPDATE_LOW( bitmap16alt )
{
unsigned p0 = tbl_bit16[ramb >> 6][rama >> 6];
unsigned p1 = tbl_bit16[(ramb >> 4) & 3][(rama >> 4) & 3];
unsigned p2 = tbl_bit16[(ramb >> 2) & 3][(rama >> 2) & 3];
unsigned p3 = tbl_bit16[ramb & 3][rama & 3];
dst[0] = dst[1] = pal[ p0 ];
dst[2] = dst[3] = pal[ p1 ];
dst[4] = dst[5] = pal[ p2 ];
dst[6] = dst[7] = pal[ p3 ];
}
END_UPDATE
/* 640x200 (80 text column), 2-colors, no constraint */
@ -786,6 +822,7 @@ static const thom_scandraw thom_scandraw_funcs[THOM_VMODE_NB][2] =
FUN(bitmap16), FUN(page1), FUN(page2), FUN(overlay), FUN(overlay3),
FUN(to9), FUN(mode80_to9),
FUN(bitmap4althalf), FUN(mo5alt), FUN(overlayhalf),
FUN(bitmap16alt)
};