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author AJR <ajrhacker@users.noreply.github.com>2023-11-22 17:17:46 -0500
committer AJR <ajrhacker@users.noreply.github.com>2023-11-22 17:17:46 -0500
commitfd1969bee2bf1320963040d62ee911ff520db48f (patch)
tree8142a3ffaf37a2c148de370efe9997981988241d /src
parent97f01e27747aa6ce04798ada63a6fbf283cd1824 (diff)
irem/travrusa.cpp: Correct CPU clock and screen timings based on schematics
Diffstat (limited to 'src')
-rw-r--r--src/mame/irem/travrusa.cpp9
1 files changed, 2 insertions, 7 deletions
diff --git a/src/mame/irem/travrusa.cpp b/src/mame/irem/travrusa.cpp
index dd7e83998ce..5656a8488b4 100644
--- a/src/mame/irem/travrusa.cpp
+++ b/src/mame/irem/travrusa.cpp
@@ -296,17 +296,12 @@ void travrusa_state::machine_reset()
void travrusa_state::travrusa(machine_config &config)
{
/* basic machine hardware */
- Z80(config, m_maincpu, 4000000); /* 4 MHz (?) */
+ Z80(config, m_maincpu, 18.432_MHz_XTAL / 6);
m_maincpu->set_addrmap(AS_PROGRAM, &travrusa_state::main_map);
/* video hardware */
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
- screen.set_refresh_hz(56.75);
- screen.set_vblank_time(ATTOSECONDS_IN_USEC(1790) /* accurate frequency, measured on a Moon Patrol board, is 56.75Hz. */);
- /* the Lode Runner manual (similar but different hardware) */
- /* talks about 55Hz and 1790ms vblank duration. */
- screen.set_size(32*8, 32*8);
- screen.set_visarea(1*8, 31*8-1, 0*8, 32*8-1);
+ screen.set_raw(18.432_MHz_XTAL / 3, 384, 8, 248, 282, 0, 256); // verified from schematics; accurate frequency, measured on a Moon Patrol board, is 56.75Hz
screen.set_screen_update(FUNC(travrusa_state::screen_update_travrusa));
screen.set_palette(m_palette);
// Race start countdown in shtrider needs multiple interrupts per frame to sync, mustache.cpp has the same, and is also a Seibu game