David P. Reed wrote:
I do remind all that 0x80 is a BIOS-specific standard, and is per BIOS -
other ports have been used in the history of the IBM PC family by some
vendors, and some machines have used it for DMA port mapping!!
Correction: ALL machines use it for DMA port mapping. The port is
assigned to the legacy DMA controller, but performs no operation.
That's what makes it safe to write (NOT read!)
-hpa
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