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funtech/supracan.cpp: fine tune FRC a bit

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This commit is contained in:
angelosa 2024-09-08 20:18:32 +02:00
parent eefd9b2f85
commit 8e15a98d09
1 changed files with 5 additions and 2 deletions
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7
src/mame/funtech/supracan.cpp
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@ -1570,6 +1570,8 @@ void supracan_state::update_frc_state()
{ {
if ((m_frc_control & 0xff00) == 0xa200) if ((m_frc_control & 0xff00) == 0xa200)
{ {
const u32 period = ((m_frc_control & 0xff << 16) | (m_frc_frequency));
// HACK: handle case by case until we resolve the equation // HACK: handle case by case until we resolve the equation
// (particularly with variable frequencies) // (particularly with variable frequencies)
switch(m_frc_control & 0xf) switch(m_frc_control & 0xf)
@ -1585,7 +1587,7 @@ void supracan_state::update_frc_state()
// - causes a crash at boot if too fast; // - causes a crash at boot if too fast;
// - takes roughly 6 seconds for a title screen individual kanji to move right-to-left; // - takes roughly 6 seconds for a title screen individual kanji to move right-to-left;
case 1: case 1:
m_frc_timer->adjust(attotime::from_hz(30)); m_frc_timer->adjust(m_maincpu->cycles_to_attotime(1024 * period), 0);
break; break;
// gamblord: sets 0xa20f normally, plays with frequency register a lot. // gamblord: sets 0xa20f normally, plays with frequency register a lot.
@ -1593,8 +1595,9 @@ void supracan_state::update_frc_state()
// - takes ~1 second for character screen to switch; // - takes ~1 second for character screen to switch;
// - during gameplay sometimes switches to 0xa200 / 0xffff; // - during gameplay sometimes switches to 0xa200 / 0xffff;
case 0xf: case 0xf:
m_frc_timer->adjust(attotime::from_hz(120)); m_frc_timer->adjust(m_maincpu->cycles_to_attotime(8192 * period), 0);
break; break;
default: default:
popmessage("Attempt to fire up FRC with %04x %04x", m_frc_control, m_frc_frequency); popmessage("Attempt to fire up FRC with %04x %04x", m_frc_control, m_frc_frequency);
break; break;