exxos's Atari, Amiga & retro forum

DECODER & BOOSTER



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..


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:

Bit more progress...

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..

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 ?



Running in STram works fine..


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

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.

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.

stephen_usher wrote: 19 Jan 2021 16:59 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.

@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...?

@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.

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.