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osborne1: buffer vertical scroll at start of visible area

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This commit is contained in:
Vas Crabb 2015-10-30 22:41:25 +11:00
parent 48bb0957aa
commit 841fd6adf6
1 changed files with 5 additions and 2 deletions
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7
src/mame/machine/osborne1.c
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@ -209,8 +209,6 @@ WRITE8_MEMBER( osborne1_state::video_pia_port_a_w )
WRITE8_MEMBER( osborne1_state::video_pia_port_b_w )
{
m_scroll_y = data & 0x1F;
m_beep_state = BIT(data, 5);
if (BIT(data, 6))
@ -345,9 +343,14 @@ TIMER_CALLBACK_MEMBER(osborne1_state::video_callback)
// Check for start/end of visible area and clear/set CA1 on video PIA
if (y == 0)
{
m_scroll_y = m_pia1->b_output() & 0x1F;
m_pia1->ca1_w(0);
}
else if (y == 240)
{
m_pia1->ca1_w(1);
}
if (y < 240)
{