exxos's Atari, Amiga & retro forum

That’s rather faster than the original TF536 with @agranlund’s last firmware release. You were saying that your version didn’t throttle down to 8MHz when accessing the ST hardware. Could this be retrofitted to work on the original card?

stephen_usher wrote: 13 Feb 2022 23:40 That’s rather faster than the original TF536 with @agranlund’s last firmware release. Could this be retrofitted to work on the original card?

Basically no. I revised the hardware and firmware for the ST edition.

stephen_usher wrote: 13 Feb 2022 23:40 You were saying that your version didn’t throttle down to 8MHz when accessing the ST hardware.

It runs at 50MHz all the time even when accessing the ST bus.

So, the techniques used by your changed firmware couldn’t be applied to agranlund’s code to speed the original design up then?

stephen_usher wrote: 14 Feb 2022 04:50 So, the techniques used by your changed firmware couldn’t be applied to agranlund’s code to speed the original design up then?

I had problems with the original 536 on the H4 which is why I designed a new one with fixes I knew were needed for the ST. I re-wrote pretty much the whole firmware. Which wasn't easy as I'm a n00b at verilog.

Fair enough. I do remember seeing your pain of learning Verilog during your development process.

The TF536 with the current firmware is pretty hobbled unless the task is purely processor bound and using Fast-RAM exclusively.

stephen_usher wrote: 13 Feb 2022 20:20 Atari TT030, program run from TT-RAM: 2876 frames.

Thanks Stephen. What VBL rate is that at, please?

BW

exxos wrote: 13 Feb 2022 23:06 @Badwolf

[H5] TF526 ST Edition EMUTOS : 3140

[H5] TF526 ST Edition TOS206 : 2827

This is odd. I've never seen any difference between TOS and EmuTOS. Frontier barely touches the OS.

Is EmuTOS in ROM?

(and I assume you mean 536?)

BW

Badwolf wrote: 14 Feb 2022 13:43

stephen_usher wrote: 13 Feb 2022 20:20 Atari TT030, program run from TT-RAM: 2876 frames.

Thanks Stephen. What VBL rate is that at, please?

BW

The only one that the TT can do, 60Hz (VGA-ish).

stephen_usher wrote: 14 Feb 2022 14:00 The only one that the TT can do, 60Hz (VGA-ish).

Ah, I didn't know it couldn't drive an old-school monitor. That's a pity. You'd be up around 3.5k if it could do RGB PAL!

BW

Badwolf wrote: 14 Feb 2022 13:48 This is odd. I've never seen any difference between TOS and EmuTOS. Frontier barely touches the OS.

Is EmuTOS in ROM?

(and I assume you mean 536?)

BW

536 yep oops.

I think its "lower ram variables" ? I will try and test the original MAPROM later, but it never worked for me. I don't get the speed up either, but thats the results I got.

But I have also noticed something peculiar Speed comparisons as well where EMUTOS when at double speed in GB6 tests than TOS206. but I really have not had time to look into it all. But with my limited knowledge of how the OS works am not really " qualified" for investigating all that stuff.