CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Information and news about the 68SEC000 64MHz booster.
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exxos
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by exxos »

czietz wrote: Wed Apr 13, 2022 11:17 am Here you go. Test program runs "MOVE SR,Dx" in user mode and tests whether this is a privileged instruction. It isn't on the 68000 and it should not be on the 68SEC000, either.
:thanksyellow:


Will report back once tested out. Finally see what's what then.
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

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czietz wrote: Wed Apr 13, 2022 11:17 am Here you go. Test program runs "MOVE SR,Dx" in user mode and tests whether this is a privileged instruction. It isn't on the 68000 and it should not be on the 68SEC000, either.
I just gave it a try but the text vanishes to fast to read its result.
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by czietz »

Run it from a command line such as EmuCON.
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

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@czietz
MOVE from SR is NOT privileged
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by czietz »

exxos wrote: Mon Apr 18, 2022 5:47 pm
MOVE from SR is NOT privileged
So, it's the same as on the plain 68000. Therefore, the Wikipedia article and the 68k PRM are wrong regarding the 68SEC000 and this instruction, as @ijor and I already had suspected.
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

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czietz wrote: Mon Apr 18, 2022 5:58 pm So, it's the same as on the plain 68000. Therefore, the Wikipedia article and the 68k PRM are wrong regarding the 68SEC000 and this instruction, as @ijor and I already had suspected.
:bravo: :thanksyellow:
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by ijor »

Nice. But please note this still doesn't mean that is 100% compatible with a "regular" 68000. But in the worst case it might have some minor issues that should probably affect only some protections.
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

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ijor wrote: Mon Apr 18, 2022 11:53 pm Nice. But please note this still doesn't mean that is 100% compatible with a "regular" 68000. But in the worst case it might have some minor issues that should probably affect only some protections.
True. If you can suggest some to try I can run the CPU at 8mhz when I get chance. I would imagine faster CPU speeds will inherently break some stuff anyway.

The CPU isn't 100% emulating the 68000 anyway. I push the ACIA chips to the max. I assume running E-clock faster wouldn't break stuff but I don't know about timing sensitive stuff anyway. Bus grant works slightly diffently as well.
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

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exxos wrote: Tue Apr 19, 2022 12:05 am The CPU isn't 100% emulating the 68000 anyway. I push the ACIA chips to the max. I assume running E-clock faster wouldn't break stuff but I don't know about timing sensitive stuff anyway. Bus grant works slightly diffently as well.
Could your acclerated ACIAs be exacerbating your soft reboot problems in EmuTOS, incidentally? Or was that on the 536?

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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

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Badwolf wrote: Tue Apr 19, 2022 12:27 pm Could your accelerated ACIAs be exacerbating your soft reboot problems in EmuTOS, incidentally? Or was that on the 536?
I've lost track whats what. The SEC booster was only resetting AFAIK when running 64MHz due to bus loading. It would run fine on 50MHz. The ACIA's are rated up to 2Mhz anyway, so they are not being " overclocked" as such. But obviously they are not being clocked at 500KHz either.
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