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mc6846 - fix the timer modes.

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The bit definitions for the timer modes were backwards.
This commit is contained in:
68bit 2019-07-25 22:51:12 +10:00
parent db0110d12b
commit d100c6a1ef
1 changed files with 14 additions and 14 deletions
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28
src/devices/machine/mc6846.cpp
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@ -199,12 +199,12 @@ inline void mc6846_device::timer_launch()
m_cto = 0;
break;
case 0x20: /* single-shot */
m_cto = 0;
m_one_shot->reset(clocks_to_attotime(FACTOR));
case 0x20: /* cascaded single-shot */
break;
case 0x30: /* cascaded single-shot */
case 0x30: /* single-shot */
m_cto = 0;
m_one_shot->reset(clocks_to_attotime(FACTOR));
break;
default:
@ -245,12 +245,12 @@ TIMER_CALLBACK_MEMBER( mc6846_device::timer_expire )
m_cto = 1 ^ m_cto;
break;
case 0x20: /* single-shot */
m_cto = 0;
case 0x20: /* cascaded single-shot */
m_cto = ( m_tcr & 0x80 ) ? 1 : 0;
break;
case 0x30: /* cascaded single-shot */
m_cto = ( m_tcr & 0x80 ) ? 1 : 0;
case 0x30: /* single-shot */
m_cto = 0;
break;
default:
@ -439,14 +439,14 @@ WRITE8_MEMBER(mc6846_device::write)
{
static const char *const mode[8] =
{
"continuous", "cascaded", "continuous", "one-shot",
"freq-cmp", "freq-cmp", "pulse-cmp", "pulse-cmp"
"continuous", "freq-cmp", "continuous", "pulse-cmp",
"cascaded", "freq-cmp", "one-shot", "pulse-cmp"
};
LOG( "%s %f: mc6846 TCR write $%02X reset=%i clock=%s scale=%i mode=%s out=%s\n",
machine().describe_context(), machine().time().as_double(), data,
(data >> 7) & 1, (data & 0x40) ? "extern" : "sys",
(data & 0x40) ? 1 : 8, mode[ (data >> 1) & 7 ],
(data & 1) ? "enabled" : "0" );
data & 1, (data & 2) ? "sys" : "extern",
(data & 4) ? 8 : 1, mode[ (data >> 3) & 7 ],
(data & 0x80) ? "enabled" : "0" );
m_tcr = data;
if ( m_tcr & 1 )
@ -454,7 +454,7 @@ WRITE8_MEMBER(mc6846_device::write)
/* timer preset = initialization without launch */
m_preset = m_latch;
m_csr &= ~1;
if ( MODE != 0x30 )
if ( MODE != 0x20 )
m_cto = 0;
update_cto();
m_interval->reset();