This adds support for Chips & Technologies 82C606 CHIPSpak Multifunction
Controller emulation. It is similar enough to 82C710 that supporting the
82C606 is merely a matter of adding a variant to the existing code.
The 82C606 is notably used in the Victor V86P portable computer.
Compared to 82C710, the 82C606 provides neither floppy nor IDE hard
driver support. On the other hand it provides a RTC with non-volatile
CMOS RAM and a Game Port. The base addresses and interrupt lines of the
peripherals are configurable.
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