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path: root/src/devices/bus/hp_dio/hp98620.cpp
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Diffstat (limited to 'src/devices/bus/hp_dio/hp98620.cpp')
-rw-r--r--src/devices/bus/hp_dio/hp98620.cpp27
1 files changed, 24 insertions, 3 deletions
diff --git a/src/devices/bus/hp_dio/hp98620.cpp b/src/devices/bus/hp_dio/hp98620.cpp
index e4a7aba82b6..b27857a2fd3 100644
--- a/src/devices/bus/hp_dio/hp98620.cpp
+++ b/src/devices/bus/hp_dio/hp98620.cpp
@@ -188,9 +188,18 @@ READ16_MEMBER(dio16_98620_device::dma_r)
break;
case REG0_1TQ4_STATUS:
ret = 0;
+ if (m_regs[0].armed)
+ ret |= REG_1TQ4_STATUS_ARMED;
+ if (m_regs[0].irq)
+ ret |= REG_1TQ4_STATUS_INT;
break;
case REG1_1TQ4_STATUS:
ret = 0;
+ if (m_regs[1].armed)
+ ret |= REG_1TQ4_STATUS_ARMED;
+ if (m_regs[1].irq)
+ ret |= REG_1TQ4_STATUS_INT;
+
break;
default:
LOG("%s: unknown register read: %02X\n", __FUNCTION__, offset << 1);
@@ -204,7 +213,7 @@ void dio16_98620_device::update_ctrl(const int channel, const uint16_t data, con
{
assert(channel < 2);
- m_regs[channel].control = data;
+ m_regs[channel].control = data & ~REG_1TQ4_CONTROL_START;
m_regs[channel].ie = data & REG_CONTROL_IE;
m_regs[channel].irq_level = 3 + ((data >> REG_CONTROL_INT_SHIFT) & REG_CONTROL_INT_MASK);
m_regs[channel].lword = (data & REG_1TQ4_CONTROL_LWORD) && is_1tq4;
@@ -288,6 +297,16 @@ WRITE16_MEMBER(dio16_98620_device::dma_w)
update_ctrl(1, data, false);
break;
+ case REG_GENERAL_CONTROL:
+ if (data & REG_GENERAL_CONTROL_RESET0) {
+ m_regs[0].armed = 0;
+ }
+
+ if (data & REG_GENERAL_CONTROL_RESET1) {
+ m_regs[1].armed = 0;
+ }
+ break;
+
case REG0_1TQ4_CONTROL:
update_ctrl(0, data, true);
break;
@@ -342,8 +361,10 @@ void dio16_98620_device::dma_transfer(int channel)
if (m_regs[channel].tc-- == 0) {
LOG("DMA%d done\n", channel);
m_regs[channel].armed = false;
- m_regs[channel].irq = true;
- update_irq();
+ if (m_regs[channel].ie) {
+ m_regs[channel].irq = true;
+ update_irq();
+ }
return;
}