Strange address 0xFFFFFF00

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paul_met

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Faced with a strange address that goes beyond the Sega Saturn memory address space - 0xFFFFFF00. How to track read / write at this address? The Yabause debugger does not allow this. Maybe this address is a mirror of some other address?
 

mrkotfw

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Clear bits 29~31. Yabause won't accept addresses with those bits set. Not sure why it's so strict.
 

antime

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0xFFFFFE00-0xFFFFFFFF is the SH7095/SH7604 on-chip peripheral address range. 0xFFFFFF00 is the DVSR register of the division unit.
 

Ponut

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Well, this is not an address, per se. It is a register. So the fact it isn't in Yabause debugger is their fault.

To be more helpful, this register has read and write permission. So you could create a hack which, at your desired point, issues the command
STS DVSR,R#
and then check what's in the general purpose register you moved it to.
 
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