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sm511: update some notes (nw)

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This commit is contained in:
hap 2018-01-18 20:37:32 +01:00
parent 18f012e109
commit cb487cd0e9
2 changed files with 8 additions and 8 deletions
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2
src/devices/cpu/sm510/sm510op.cpp
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@ -408,7 +408,7 @@ void sm510_base_device::op_rme()
void sm510_base_device::op_tmel()
{
// TMEL: skip next if rest signal is set, reset it
// TMEL: skip next if melody stop flag is set, reset it
m_skip = ((m_melody_rd & 2) != 0);
m_melody_rd &= ~2;
}

14
src/devices/cpu/sm510/sm511core.cpp
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@ -93,20 +93,20 @@ void sm511_device::clock_melody()
return;
// tone cycle table (SM511/SM512 datasheet fig.5)
// cmd 0 = cmd, 1 = stop, > 13 = illegal(unknown)
// cmd 0 = rest, 1 = stop, > 13 = illegal(inactive?)
static const u8 lut_tone_cycles[4*16] =
{
0, 0, 7, 8, 8, 9, 9, 10,11,11,12,13,14,14, 7*2, 8*2,
0, 0, 8, 8, 9, 9, 10,11,11,12,13,13,14,15, 8*2, 8*2,
0, 0, 8, 8, 9, 9, 10,10,11,12,12,13,14,15, 8*2, 8*2,
0, 0, 8, 9, 9, 10,10,11,11,12,13,14,14,15, 8*2, 9*2
0, 0, 7, 8, 8, 9, 9, 10,11,11,12,13,14,14, 0, 0,
0, 0, 8, 8, 9, 9, 10,11,11,12,13,13,14,15, 0, 0,
0, 0, 8, 8, 9, 9, 10,10,11,12,12,13,14,15, 0, 0,
0, 0, 8, 9, 9, 10,10,11,11,12,13,14,14,15, 0, 0,
};
u8 cmd = m_melody_rom[m_melody_address] & 0x3f;
u8 out = 0;
// clock duty cycle if tone is active
if ((cmd & 0xf) > 1)
if ((cmd & 0xf) >= 2 && (cmd & 0xf) <= 13)
{
out = m_melody_duty_index & m_melody_rd & 1;
m_melody_duty_count++;
@ -121,7 +121,7 @@ void sm511_device::clock_melody()
}
else if ((cmd & 0xf) == 1)
{
// rest tell signal
// set melody stop flag
m_melody_rd |= 2;
}