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In case of the PAK, the 68000 is in indeed on top. But the three signals I mentioned are the only ones that are not connected straight through. Thus, (without thinking it through in detail) it should also work with the CPU on the motherboard, if you break the three signals.exxos wrote: 10 Jul 2020 10:10 @czietz doesn't that assume the 68000 is plugged ontop of the pak ? Things could get more of a problem when the CPU is on the motherboard.
Oh sure, I'm already having to build a custom relocator board to make the TF536 hopefully fit in the Stacy, so incorporating the necessary signal breakages/reroutings is easy enough. I just don't know if the TF536 will actually sit quietly on the bus without them like the 68000 does. Only way to find out is to test, which I'll do once I have the built 536.PhilC wrote: 10 Jul 2020 10:30 Breaking the signals on the TF536 could be as simple as not soldering those pins on the DIL cpu header and routing them through a switch, pld etc.
Barring polar bear attack, it'll arrive next week. :lol:
And to think our posties complain about dogs, can't imagine how they'd get on with polar bears :shock: :lol:
Don't ever leave a chip on a bus with no power on... the results are unpredictable.. the 68000 could still get enough power to run via the protection diodes .. or at least enough power to go nuts and crash things. If you're gonna do this you need to modify your machine to be able to isolate the arb lines and E.derkom wrote: 10 Jul 2020 09:45 I'm talking a far more basic approach here, of electrically "switching off" the 68000. In my test on the H4, I put DIP 68000s in two of the expansion sockets (having removed the PLCC 68k, and verifying it will boot off either DIP alone), and then literally just bending out both of the VCC pins on one of them, so that it should just be a dead chip at that point, no power. But unfortunately even without power, it seems to be soiling the bus in some way.
So it seems. So, since the answer isn't powering things down, this raises another question: If I'm isolating the TF536 this way, will the altram and IDE interfaces still work? I'll have IDE on the Lightning anyway, and was expecting to use that since it would always be present, whether running 68000 or 68030, but now I'm wondering if the TF536's IDE might also be present all the time, even if the 68030 isn't answering. Obviously I can figure this out by testing, but perhaps you already know the answer.terriblefire wrote: 10 Jul 2020 15:18 If you're gonna do this you need to modify your machine to be able to isolate the arb lines and E.
No the altram and IDE only respond to the 030 lines.derkom wrote: 10 Jul 2020 15:39 So it seems. So, since the answer isn't powering things down, this raises another question: If I'm isolating the TF536 this way, will the altram and IDE interfaces still work? I'll have IDE on the Lightning anyway, and was expecting to use that since it would always be present, whether running 68000 or 68030, but now I'm wondering if the TF536's IDE might also be present all the time, even if the 68030 isn't answering. Obviously I can figure this out by testing, but perhaps you already know the answer.