exxos blog - random goings on

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Re: exxos blog - random goings on

Post by exxos » Thu Jan 14, 2021 10:45 pm

DECODER & BOOSTER


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The scores are a tiny bit slower than the V2.2 booster. Part of it was the clock switching logic was glitching because of a faster PLD :roll: So I had to add a small delay in the logic to prevent it.. the side effect is a few % slower speeds.. But still, its still not far off anyway..

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EDIT:

Saying that I changed the compiler to "slow" outputs and while there is a small glitch, with the original code its still a few % slower :shrug:
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Re: exxos blog - random goings on

Post by exxos » Fri Jan 15, 2021 3:45 pm

Bit more progress...

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Re: exxos blog - random goings on

Post by exxos » Mon Jan 18, 2021 8:37 pm

Built up 4 boosters, just testing out the second one now.. I had a issue of crashing after its been on a bit, thought it was the CPU, but seems theres more noise on the clock than I would have liked. So a small mod and the first one has been running for the past few hours..

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Re: exxos blog - random goings on

Post by exxos » Tue Jan 19, 2021 3:50 pm

Been trying to get the TF536 working with EMUTOS 1.0.. There is odd stuff going on all over the place. Without the blitter I cant even access the floppy.. But when I do put the blitter in, things are better, but when running GB6 from alt-ram, I get this error ? @czietz @thorsten.otto ?

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Running in STram works fine..

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EMUTOS finds the 64MB atl-ram as well..

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Re: exxos blog - random goings on

Post by czietz » Tue Jan 19, 2021 4:41 pm

What the error message means: An illegal ("line F") CPU instruction was executed within GEM Bench. Since I assume that there are no illegal instructions in GEM Bench: This can happen when (for whatever reason: faulty RAM, wrong timing of RAM reads) 0xFFFF is read by the CPU instead of the correct instruction.

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Re: exxos blog - random goings on

Post by stephen_usher » Tue Jan 19, 2021 4:59 pm

Looking at the timings, are you sure you don't have a load of ground bounce going on?

That's the sort of nonsense my system was doing without the ground plane on my board. Those 99%s look suspiciously like lost clock cycles.
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Re: exxos blog - random goings on

Post by exxos » Tue Jan 19, 2021 5:30 pm

stephen_usher wrote:
Tue Jan 19, 2021 4:59 pm
Looking at the timings, are you sure you don't have a load of ground bounce going on?

That's the sort of nonsense my system was doing without the ground plane on my board. Those 99%s look suspiciously like lost clock cycles.
All the boosters I have ever seen with 020, 030 always seem to have slightly slower speeds than expected.
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Re: exxos blog - random goings on

Post by JezC » Tue Jan 19, 2021 6:48 pm

@exxos I have seen a similar issue with the floppy on my H4 with TF536 fitted and EmuTOS v1.0...but the same setup seems to work fine with a slightly older EmuTOS.
I'm on the phone at present but the earlier version that agranlund posted still works fine.

I boot EmuTOS from floppy with his special EmuTOS boot ROM image & with the v0.9x it all works fine...but change to loading v1.0 from floppy & it boots ok but then the floppy stops working. :shrug:

May not be the same...but maybe it is...?

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Re: exxos blog - random goings on

Post by exxos » Tue Jan 19, 2021 6:52 pm

@JezC Its all to confusing with all the various softwares , firmwares and patches about. Its hard to work out whats what with it all. Things mostly seem to start going nuts when alt-ram is enabled.. but it still isn't stable with it off.. Its gone back "on the shelf" for a bit, as its not going to be simple to work it all out.
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Re: exxos blog - random goings on

Post by exxos » Tue Jan 19, 2021 6:55 pm

I have gone back to my SEC booster on my H4.. Took a bit of working out as there seemed to be a bad connection on the CPU preventing it from booting :roll:

I'm going to try and hook up the fast-ram boards I got made over a year ago.. So I can just run GB6 from my own alt-ram and see where it all ends up.

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