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68060, DBxx loop and IRQs

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Hi,

this is a question hopefully reaching the (small) 68060 community :-)

Talking about former times we remembered an issue of the 68060 CPU: no
IRQ handling when in a DBxx loop. But nobody was there who knew real
facts. Then I asked startpage, duckduckgo .. but no hint. I read my old
books, the 060 User's manual and the 68000 Family Reference Manual.
Nothing.

In a German web forum somebody asked ChatGPT. Better than nothing. But
do you believe in a language model?

I have a couple of questions:
- This issue seems to be a 060 issue. Correct?
- Are there dependencies to the mask? Back in the 1990s we used some
MVME177, the CPUs were XC68060, we had 2 masks: 1F43G and 1G65V.
- Are IRQs blocked just in a DBxx loop without any instruction inside? 
- Which IRQs are involved: just the external IRQs from the peripherals
(level 1..7) or also internal exceptions like an Address Error or any
TRAP?

Regards
Ralf

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68060, DBxx loop and IRQs R.Kiefer.SPAEM@gmx.de (Ralf Kiefer) - 2025-09-15 22:49 +0200
  Re: 68060, DBxx loop and IRQs Buzz McCool <buzz_mccool@yahoo.com> - 2025-09-24 10:59 -0700
    Re: 68060, DBxx loop and IRQs R.Kiefer.SPAEM@gmx.de (Ralf Kiefer) - 2025-09-25 14:13 +0200

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