irem/travrusa.cpp: Correct CPU clock and screen timings based on schematics

This commit is contained in:
AJR 2023-11-22 17:17:46 -05:00
parent 97f01e2774
commit fd1969bee2

View File

@ -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