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z80dma: correct end of block test again

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This commit is contained in:
Patrick Mackinlay 2023-01-30 20:03:03 +07:00
parent 34c25a9a36
commit 3035a7b436
1 changed files with 8 additions and 2 deletions
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10
src/devices/machine/z80dma.cpp
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@ -460,7 +460,7 @@ int z80dma_device::do_write()
uint8_t mode;
mode = TRANSFER_MODE;
if (m_count == 0x0000)
if (m_byte_counter == 0x0000)
{
//FIXME: Any signal here
}
@ -487,7 +487,13 @@ int z80dma_device::do_write()
m_addressB += PORTB_FIXED ? 0 : PORTB_INC ? 1 : -1;
m_byte_counter++;
done = (m_count == m_byte_counter);
/*
* HACK: The user manual states that 216+1 bytes are transferred when the
* block length is set to zero, however it also states the maximum length
* is 64Kbytes. For transfers less than the maximum, the value in the block
* length regster is set to N-1.
*/
done = (m_byte_counter == (m_count ? m_count + 1 : m_count));
if (done)
{