Datagear DMA Port
From SpecNext official Wiki
|Short desc.||Controls zxnDMA chip|
|Bit Mask||---- ---- 0110 1011|
since core 3.1.2 this port $6B is always in "zxnDMA" mode, for "Zilog DMA" use MB02 DMA Port ($xx0B / 11).
Be aware the zxnDMA is by default in the new "zxnDMA" mode, acting slightly differently than original Zilog DMA.
Use Peripheral 2 Register ($06) to enable the "Zilog DMA" mode in case your SW expects Zilog-like behaviour of DMA transfers.