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cdc721: Use row pointers (nw)

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This commit is contained in:
AJR 2018-03-25 10:26:29 -04:00
parent 69e0c4d1d5
commit f8e2efc6e9
1 changed files with 7 additions and 6 deletions
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13
src/mame/drivers/cdc721.cpp
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@ -76,8 +76,8 @@ void cdc721_state::mem_map(address_map &map)
{
map(0x0000, 0x4fff).rom().region("maincpu", 0x10000);
// AM_RANGE(0x0000, 0x4fff) AM_READ_BANK("bankr0") AM_WRITE_BANK("bankw0")
map(0x8000, 0xe10f).ram();
map(0xe110, 0xffff).ram().share("videoram");
map(0x8000, 0xdfff).ram();
map(0xe000, 0xffff).ram().share("videoram");
}
void cdc721_state::io_map(address_map &map)
@ -141,11 +141,13 @@ PALETTE_INIT_MEMBER( cdc721_state, cdc721 )
uint32_t cdc721_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
uint8_t y,ra,chr,gfx,attr,pen;
uint16_t sy=0,ma=0,x;
uint16_t sy=0,x;
m_flashcnt++;
for (y = 0; y < 30; y++)
{
uint16_t ma = m_p_videoram[y * 2] | m_p_videoram[y * 2 + 1] << 8;
for (ra = 0; ra < 16; ra++)
{
uint16_t *p = &bitmap.pix16(sy++);
@ -153,8 +155,8 @@ uint32_t cdc721_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap
for (x = 0; x < 160; x+=2)
{
pen = 1;
chr = m_p_videoram[x+ma];
attr = m_p_videoram[x+ma+1];
chr = m_p_videoram[(x + ma) & 0x1fff];
attr = m_p_videoram[(x + ma + 1) & 0x1fff];
gfx = m_p_chargen[chr | (ra << 8) ];
if (BIT(attr, 0)) // blank
pen = 0;
@ -178,7 +180,6 @@ uint32_t cdc721_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap
*p++ = BIT(gfx, 7) ? pen : 0;
}
}
ma+=264;
}
return 0;
}