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upd7810: Make internal timers run at former speed (nw)

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This commit is contained in:
AJR 2020-03-05 20:31:53 -05:00
parent afc8bb1a26
commit 61d087db78
1 changed files with 19 additions and 19 deletions
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38
src/devices/cpu/upd7810/upd7810.cpp
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@ -1306,11 +1306,11 @@ void upd7810_device::handle_timers(int cycles)
{
switch (TMM & 0x0c) /* timer 0 clock source */
{
case 0x00: /* clock divided by 12 */
upd7810_handle_timer0(cycles, 12);
case 0x00: /* clock divided by 12 (machine cycles divided by 4) */
upd7810_handle_timer0(cycles, 4);
break;
case 0x04: /* clock divided by 384 */
upd7810_handle_timer0(cycles, 384);
case 0x04: /* clock divided by 384 (machine cycles divided by 128) */
upd7810_handle_timer0(cycles, 128);
break;
case 0x08: /* external signal at TI */
break;
@ -1326,11 +1326,11 @@ void upd7810_device::handle_timers(int cycles)
{
switch (TMM & 0x60) /* timer 1 clock source */
{
case 0x00: /* clock divided by 12 */
upd7810_handle_timer1(cycles, 12);
case 0x00: /* clock divided by 12 (machine cycles divided by 4) */
upd7810_handle_timer1(cycles, 12/3);
break;
case 0x20: /* clock divided by 384 */
upd7810_handle_timer1(cycles, 384);
case 0x20: /* clock divided by 384 (machine cycles divided by 128) */
upd7810_handle_timer1(cycles, 384/3);
break;
case 0x40: /* external signal at TI */
break;
@ -1344,11 +1344,11 @@ void upd7810_device::handle_timers(int cycles)
if (0x02 == (TMM & 0x03))
{
OVCF += cycles;
while (OVCF >= 3)
while (OVCF >= 1)
{
TO ^= 1;
m_to_func(TO);
OVCF -= 3;
OVCF -= 1;
}
}
@ -1361,9 +1361,9 @@ void upd7810_device::handle_timers(int cycles)
{
OVCE += cycles;
/* clock divided by 12 */
while (OVCE >= 12)
while (OVCE >= 12/3)
{
OVCE -= 12;
OVCE -= 12/3;
ECNT++;
/* Interrupt Control Circuit */
if (ETM0 == ECNT)
@ -1412,9 +1412,9 @@ void upd7810_device::handle_timers(int cycles)
break;
case 0x01: /* internal clock divided by 384 */
OVCS += cycles;
while (OVCS >= 384)
while (OVCS >= 384/3)
{
OVCS -= 384;
OVCS -= 384/3;
if (0 == (EDGES ^= 1))
upd7810_sio_input();
else
@ -1423,9 +1423,9 @@ void upd7810_device::handle_timers(int cycles)
break;
case 0x02: /* internal clock divided by 24 */
OVCS += cycles;
while (OVCS >= 24)
while (OVCS >= 24/3)
{
OVCS -= 24;
OVCS -= 24/3;
if (0 == (EDGES ^= 1))
upd7810_sio_input();
else
@ -1441,9 +1441,9 @@ void upd7810_device::handle_timers(int cycles)
/* reset A/D converter */
m_adcnt = 0;
if (ANM & 0x10)
m_adtot = 144;
m_adtot = 144/3;
else
m_adtot = 192;
m_adtot = 192/3;
m_adout = 0;
m_shdone = 0;
if (ANM & 0x01)
@ -1548,7 +1548,7 @@ void upd7801_device::handle_timers(int cycles)
m_to_func(TO);
/* Reload the timer */
m_ovc0 = 16 * ( TM0 + ( ( TM1 & 0x0f ) << 8 ) );
m_ovc0 = 8 * ( TM0 + ( ( TM1 & 0x0f ) << 8 ) );
}
}
}