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X-Hacker.org- Interrupts & Ports - Norton Guide
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Port 08B - DMA Page Register (channel 5)
This register specifies the high-order 4 bits of the
channel 5 address. The DMA registers are only 16 bits wide,
so 8 bits of these additional bytes are needed to form a
24-bit address.
See Also: 8237A-5
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