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Diffstat (limited to 'src/devices/machine/hd63450.cpp')
-rw-r--r--src/devices/machine/hd63450.cpp13
1 files changed, 11 insertions, 2 deletions
diff --git a/src/devices/machine/hd63450.cpp b/src/devices/machine/hd63450.cpp
index 5787dde4b3b..27ef55487f1 100644
--- a/src/devices/machine/hd63450.cpp
+++ b/src/devices/machine/hd63450.cpp
@@ -279,7 +279,7 @@ void hd63450_device::dma_transfer_start(int channel)
m_reg[channel].csr &= ~0xe0;
m_reg[channel].csr |= 0x08; // Channel active
m_reg[channel].csr &= ~0x30; // Reset Error and Normal termination bits
- if ((m_reg[channel].ocr & 0x0c) != 0x00) // Array chain or Link array chain
+ if ((m_reg[channel].ocr & 0x0c) == 0x08) // Array chain
{
m_reg[channel].mar = space.read_word(m_reg[channel].bar) << 16;
m_reg[channel].mar |= space.read_word(m_reg[channel].bar+2);
@@ -287,6 +287,15 @@ void hd63450_device::dma_transfer_start(int channel)
if (m_reg[channel].btc > 0)
m_reg[channel].btc--;
}
+ else if ((m_reg[channel].ocr & 0x0c) == 0x0c) // Link array chain
+ {
+ u32 bar = m_reg[channel].bar;
+ m_reg[channel].mar = space.read_word(bar) << 16;
+ m_reg[channel].mar |= space.read_word(bar+2);
+ m_reg[channel].mtc = space.read_word(bar+4);
+ m_reg[channel].bar = space.read_word(bar+6) << 16;
+ m_reg[channel].bar |= space.read_word(bar+8);
+ }
// Burst transfers will halt the CPU until the transfer is complete
if ((m_reg[channel].dcr & 0xc0) == 0x00) // Burst transfer
@@ -469,7 +478,7 @@ void hd63450_device::single_transfer(int x)
m_reg[x].mar |= space.read_word(bar+2);
m_reg[x].mtc = space.read_word(bar+4);
m_reg[x].bar = space.read_word(bar+6) << 16;
- m_reg[x].bar |= space.read_word(bar+10);
+ m_reg[x].bar |= space.read_word(bar+8);
return;
}
else if (m_reg[x].ccr & 0x40)