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nubus/nubus_specpdq.cpp: Derive the horizontal visible area from the written values. [R. Belmont]

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This commit is contained in:
arbee 2024-08-01 20:51:46 -04:00
parent e08dd3f14f
commit 192dc72cc6
1 changed files with 6 additions and 16 deletions
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22
src/devices/bus/nubus/nubus_specpdq.cpp
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@ -23,7 +23,6 @@
TODO:
* Having no alternate oscillator installed is not emulated.
* Work out how active line length is configured.
* Alternate oscillator calibration is currently failing. Fixing this
probably requires a complete cycle-accurate Mac II.
@ -326,22 +325,13 @@ void nubus_specpdq_device::update_crtc()
// for some reason you temporarily get invalid screen parameters - ignore them
if (m_crtc.valid(*this))
{
rectangle active(
m_crtc.h_start(16) + (m_hdelay * 4),
m_crtc.h_end(16) - 1,
m_crtc.v_start(),
m_crtc.v_end() - 1);
int h_start_adj = (m_crtc.h_start(1) + 3) * 16;
// FIXME: work out how it actually configures the RAMDAC end-of-line
// this is a horrible hack
if (active.width() < 832)
active.set_width(640);
else if (active.width() < 1024)
active.set_width(832);
else if (active.width() < 1152)
active.set_width(1024);
else
active.set_width(1152);
rectangle active(
h_start_adj,
m_crtc.h_end(16) - 1,
m_crtc.v_start(),
m_crtc.v_end() - 1);
screen().configure(
m_crtc.h_total(16),