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tim100: prevent the unlikely possibility of a buffer overflow.

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This commit is contained in:
Robbbert 2020-11-25 01:06:16 +11:00
parent 37b00ebe8c
commit 47346ceaec
1 changed files with 4 additions and 0 deletions
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4
src/mame/drivers/tim100.cpp
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@ -97,6 +97,7 @@ void tim100_state::machine_start()
{
m_palette->set_pen_colors(0, tim100_palette);
save_item(NAME(m_dma_adr));
m_dma_adr = 0;
}
const gfx_layout charlayout =
@ -143,7 +144,10 @@ I8275_DRAW_CHARACTER_MEMBER( tim100_state::crtc_display_pixels )
WRITE_LINE_MEMBER( tim100_state::drq_w )
{
if (state)
{
m_crtc->dack_w(m_p_videoram[m_dma_adr++]);
m_dma_adr &= 0x7ff;
}
}
WRITE_LINE_MEMBER( tim100_state::irq_w )