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| Path | csiph.com!eternal-september.org!feeder.eternal-september.org!.POSTED!not-for-mail |
|---|---|
| From | Buzz McCool <buzz_mccool@yahoo.com> |
| Newsgroups | comp.sys.m68k |
| Subject | Re: 68060, DBxx loop and IRQs |
| Date | Wed, 24 Sep 2025 10:59:25 -0700 |
| Organization | A noiseless patient Spider |
| Lines | 32 |
| Message-ID | <10b1bht$3qjrr$1@dont-email.me> (permalink) |
| References | <1riq3ry.1kpjfa87ymf2cN%R.Kiefer.SPAEM@gmx.de> |
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On 9/15/2025 1:49 PM, Ralf Kiefer wrote: > 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 Have you checked the errata? https://www.nxp.com/docs/en/errata/MC68060DE.pdf I do remember getting MVME177's with XC68060 parts on them because Motorola was taking so long to deliver the 68060. I don't remember having any problems with them.
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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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