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Some more info about the Comspec RTC. Not sure whether you already emulate this, but bit 0 of the write-only register at board offset $8080 seems to be an enable for the RTC. The RTC probably only appears on the bus when that bit is set.
The ComspecSCSI.device commands for both reading and setting the RTC set that bit before accessing the RTC, and clear it afterwards. I guess protecting the RTC that way reduces the likelihood of a crashing program affecting the stored time/date.
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