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OS-9 Device Descriptor and Configuration Module Reference

OS-9 Device Descriptor and Configuration Module Reference

OS-9 Device Descriptor and Configuration Module Reference

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6PCFTM<strong>Device</strong> <strong>Descriptor</strong>s MICROWARElu_tfmDMAMODEEditMod Labels4-PCF logical unit static storage4-PCF logical unit options2-dma transfer modeDescriptionThis hardware specific byte can be set for use of DMA mode, if it isavailable. DMA requires only a single interrupt for each block ofcharacters transferred in an I/O operation. It is much faster thanmethods that interrupt for each character transferred.Port Generic Default Value0 (zero)Port Specific Override ValueRefer to PCF//DESC/config.des (Figure 6-3).Available Values-128 to 127570 <strong>OS</strong>-9 <strong>Device</strong> <strong>Descriptor</strong> <strong>and</strong> <strong>Configuration</strong> <strong>Module</strong> <strong>Reference</strong>

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