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Old 22 April 2017, 13:17   #86
mark_k
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Join Date: Aug 2004
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After quickly looking at the Comspec SetClock program and ComspecSCSI.device...

The SA1000 can have an optional real-time clock. The SetClock program expects bit 0 of er_SerialNumber (in the ExpansionRom structure) to be zero for RTC to be present.

ComspecSCSI.device command numbers 12 and 13 respectively are used to read and set the RTC time . (Those command numbers are TD_REMOVE and TD_CHANGENUM for "normal" trackdisk-like devices... but probably ComspecSCSI.device isn't supposed to be trackdisk-like, that job is for ComspecHD.device?)

Hopefully the pattern of register accesses could allow you to figure out which type of RTC chip it uses.
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