MicroCosmos sad news...

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Jeff_HxC2001
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Re: MicroCosmos sad news...

Postby Jeff_HxC2001 » Wed Jul 26, 2017 5:45 am

Greenious wrote:
ijor wrote:Timing depends, of course, on the CPU as well. I don't have personal experience with the CMOS part, but the 68HC is supposed to be fully compatible, even on undocumented features.

The asynchronous delays in the same cycle, such as tCO, are probable smaller (note that doesn't mean less cycles). Conceivable, and just conceivable, this might have some relevance. But if so, then this shouldn't be specific to the CMOS CPU. Some NMOS variations are faster than others. For instance, the MegaSTe CPU.

May be Jeff was thinking on the 68SEC000, the CPU used in the Minimig, I understand. This is a different beast and not 100% compatible.


68HC should be compatible, I believe HBS640 T28/36 used it, aswell as any other accelerator going beyong 16MHz, and this is the first time I've heard it's not 100% compatible.

I'm also inclined to think Jeff is thining of the SEC version.


No no. this was an M68HC000 @ 16Mhz.

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kodak80
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Re: MicroCosmos sad news...

Postby kodak80 » Wed Jul 26, 2017 7:59 am

Jeff_HxC2001 wrote:unfortunately using HCMOS CPU is causing others issues. Some demos doesn't work properly with HCMOS 68000...


Hi Jeff

Which demos do not work well with the HC chips? I have the 8mhz HC chip and would like to test the demos.
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Jeff_HxC2001
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Re: MicroCosmos sad news...

Postby Jeff_HxC2001 » Wed Jul 26, 2017 9:25 am

kodak80 wrote:
Jeff_HxC2001 wrote:unfortunately using HCMOS CPU is causing others issues. Some demos doesn't work properly with HCMOS 68000...


Hi Jeff

Which demos do not work well with the HC chips? I have the 8mhz HC chip and would like to test the demos.


Try this one :
http://www.atarimania.com/demo-atari-st ... 26530.html

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kodak80
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Re: MicroCosmos sad news...

Postby kodak80 » Wed Jul 26, 2017 11:09 am

Jeff_HxC2001 wrote:
kodak80 wrote:
Jeff_HxC2001 wrote:unfortunately using HCMOS CPU is causing others issues. Some demos doesn't work properly with HCMOS 68000...


Hi Jeff

Which demos do not work well with the HC chips? I have the 8mhz HC chip and would like to test the demos.


Try this one :
http://www.atarimania.com/demo-atari-st ... 26530.html

Thanks Jeff. This demo works fine in my STE with the HC 8mhz chip and 4mb. I played it safe when swapping processors and went with the same speed as the original CPU. Nice demo by the way. Will give a few more demos a test anyway to make sure.
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Re: MicroCosmos sad news...

Postby leech » Tue Aug 01, 2017 6:51 am

I can test as well. And now that the speed was mentioned... I ordered two of these tginking I could swap the CPU out of my Mega STe with one, but they are both 8Mhz. If you put a 16Mhz one into a 1040STe, could you select the speed lime the Mega STe through the control panel?
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