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Implement writes to SCSI Pseudo-DMA register.

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This commit is contained in:
Maxim Poliakovski 2023-11-01 16:16:58 +01:00
parent 58dacfa263
commit 58281520d3
3 changed files with 20 additions and 1 deletions
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15
devices/common/scsi/sc53c94.cpp
View File

@ -190,6 +190,21 @@ uint16_t Sc53C94::pseudo_dma_read()
return data_word;
}
void Sc53C94::pseudo_dma_write(uint16_t data) {
this->fifo_push((data >> 8) & 0xFFU);
this->fifo_push(data & 0xFFU);
// update DMA status
if (this->is_dma_cmd) {
this->xfer_count -= 2;
if (!this->xfer_count) {
this->status |= STAT_TC; // signal zero transfer count
//this->cur_state = SeqState::XFER_END;
this->sequencer();
}
}
}
void Sc53C94::update_command_reg(uint8_t cmd)
{
if (this->on_reset && (cmd & 0x7F) != CMD_NOP) {

1
devices/common/scsi/sc53c94.h
View File

@ -164,6 +164,7 @@ public:
uint8_t read(uint8_t reg_offset);
void write(uint8_t reg_offset, uint8_t value);
uint16_t pseudo_dma_read();
void pseudo_dma_write(uint16_t data);
// real DMA control
void real_dma_xfer(int direction);

5
devices/ioctrl/amic.cpp
View File

@ -223,7 +223,10 @@ void AMIC::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
this->mace->write((offset >> 4) & 0x1F, value);
return;
case 0x10:
this->scsi->write((offset >> 4) & 0xF, value);
if (offset & 0x100)
this->scsi->pseudo_dma_write(value);
else
this->scsi->write((offset >> 4) & 0xF, value);
return;
case 0x14: // Sound registers
switch(offset) {