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heathkit/tlb.cpp: Reverse bits in font ROMs on start to avoid doing it on scan out. (#11842)

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Mark Garlanger 2023-12-16 08:39:45 -06:00 committed by GitHub
parent 40364049dc
commit ab699b662a
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 12 additions and 4 deletions
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16
src/mame/heathkit/tlb.cpp
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@ -212,6 +212,14 @@ void heath_tlb_device::device_start()
m_key_click_timer = timer_alloc(FUNC(heath_tlb_device::key_click_off), this);
m_bell_timer = timer_alloc(FUNC(heath_tlb_device::bell_off), this);
// Flip bits in font ROM to avoid having to flip them during scan out since some
// boards with graphics has the pixel graphic reversed from the font layout. Doing
// it for all devices for consistency.
for (size_t i = 0; i < m_p_chargen.length(); i++)
{
m_p_chargen[i] = bitswap<8>(m_p_chargen[i], 0, 1, 2, 3, 4, 5, 6, 7);
}
}
void heath_tlb_device::device_reset()
@ -448,7 +456,7 @@ MC6845_UPDATE_ROW(heath_tlb_device::crtc_update_row)
// Display a scanline of a character (8 pixels)
for (int b = 0; 8 > b; ++b)
{
*p++ = palette[BIT(gfx, 7 - b)];
*p++ = palette[BIT(gfx, b)];
}
}
}
@ -1220,7 +1228,7 @@ MC6845_UPDATE_ROW(heath_superset_tlb_device::crtc_update_row)
// Display a scanline of a character (8 pixels)
for (int b = 0; 8 > b; ++b)
{
*p++ = palette[BIT(gfx, 7 - b)];
*p++ = palette[BIT(gfx, b)];
}
}
}
@ -1449,7 +1457,7 @@ MC6845_UPDATE_ROW(heath_gp19_tlb_device::crtc_update_row)
// Display a scanline of a character (8 pixels)
for (int b = 0; 8 > b; ++b)
{
*p++ = palette[BIT(gfx, 7 - b)];
*p++ = palette[BIT(gfx, b)];
}
}
}
@ -1683,7 +1691,7 @@ MC6845_UPDATE_ROW(heath_imaginator_tlb_device::crtc_update_row)
chr &= 0x7f;
}
output |= bitswap<8>(m_p_chargen[(chr << 4) | ra] ^ inv, 0, 1, 2, 3, 4, 5, 6, 7);
output |= m_p_chargen[(chr << 4) | ra] ^ inv;
}
if (m_graphics_mode_active && (x > 7 ) && (x < 73))