DMA CONTROL
Many different direct memory access (DMA) functions occur during system operation.
There is a read address as well as a write address to the DMA register so you can tell
which DMA channels are enabled.
The address names for the DMA register are as follows:
DMACONR - Direct Memory Access Control - read-only.
DMACON - Direct Memory Access Control - write-only.
The contents of this register are shown in Table 7-5 (bit on if enabled).
PROCESSOR ACCESS TO CHIP MEMORY
The Amiga chips access chip memory directly, rather than utilizing traditional bus
arbitration mechanisms. Therefore, processor supplied features for multiprocessor
support, such as the 68000 TAS (test and set) instruction, cannot serve their intended
purpose and are not supported by the Amiga architecture.
- System Control Hardware 217 -
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