Datagear DMA Port
From SpecNext Wiki
| Number | PortNumber::$xx6B |
|---|---|
| Decimal | NumberDec:: |
| Short desc. | ShortDesc::Controls Z8410 DMA chip via Datagear standard. |
| Bit Mask | PortMask::---- ---- 0110 1011 |
| Readable | Readable::Yes |
| Writable | Writable::Yes |
| Subsystem | Subsystem::DMA |
since core 3.1.2 this port $6B is always in "zxnDMA" mode, for "Zilog DMA" use {{#ask: PortNumber::$xx0B }} ($xx0B{{#ask: PortNumber::$xx0B |mainlabel=- |headers=hide |intro= / |?NumberDec#- }}).
Be aware the zxnDMA is by default in the new "zxnDMA" mode, acting slightly differently than original Zilog DMA.
Use {{#ask:
TBRegisterNumber::$06
}} ($06) to enable the "Zilog DMA" mode in case your SW expects Zilog-like behaviour of DMA transfers.