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Search took 0.42 seconds. Search: Posts Made By: ross
Forum: Coders. Asm / Hardware Today, 15:57
Replies: 28
Views: 1,215
Posted By ross
If you follow the allocation of DMA cycles in the...

If you follow the allocation of DMA cycles in the attached diagram you can notice that copper use even cycles only.
Odd cycles are for many predefined channels.

But it is only a matter of...
Forum: Coders. Asm / Hardware Today, 14:37
Replies: 28
Views: 1,215
Posted By ross
It is the exact opposite: since even cycles are...

It is the exact opposite: since even cycles are free, the copper can use them all (at least as long as the active bitplanes are <= 4 and lo-res).
The Blitter and the CPU have lower priority, so if...
Forum: Coders. Asm / Hardware 25 May 2022, 18:11
Replies: 208
Views: 218,183
Posted By ross
Yes, this is faster: move.l ...

Yes, this is faster:


move.l (127*4,a0),d0
sub.l (126*4,a0),d0


Also on bare 68k (EDIT: of course even if it were only (ax,dx.l),d0 ;)).
Forum: Coders. Asm / Hardware 24 May 2022, 11:57
Replies: 28
Views: 1,215
Posted By ross
Well, actually the chunky to planar conversion is...

Well, actually the chunky to planar conversion is not there :)

He is trying to directly display a 12-bit true color buffer on the screen.
The buffer itself is not linear (or double), because it...
Forum: Coders. Asm / Hardware 24 May 2022, 10:32
Replies: 28
Views: 1,215
Posted By ross
You have already answered what the main problem...

You have already answered what the main problem is :)

Considering a maximum preload of 15 registers (with a7=$dff180) and using 17 changes with copper (the first and last in the line),
you would...
Forum: support.WinUAE 20 May 2022, 14:45
Replies: 2
Views: 297
Posted By ross
Some changes in the latest versions concern the...

Some changes in the latest versions concern the CIAs (winuae.7z therefore must be considered 'experimental' in this regard).

Indeed, in this case the problem is related to a bit in ICR (CIA-B),...
Forum: Coders. Releases 20 May 2022, 14:33
Replies: 3
Views: 403
Posted By ross
Thanks for the release. A couple of...

Thanks for the release.

A couple of questions, maybe trivial, but I've never looked at the code of the previous versions.


Does this mean you use a technique similar to Leonard's LSP?

...
Forum: project.Amiga Game Factory 28 April 2022, 17:54
Replies: 400
Views: 75,664
Posted By ross
Nah, your code is always great :) About the...

Nah, your code is always great :)

About the DMAWait this is the relevant code (TFMX 7V player module V1.3, versionnum = $0892):

move.l 4.W,A1 ; exec base
tst.b $129(A1) ; CPU check...
Forum: project.Amiga Game Factory 27 April 2022, 10:14
Replies: 400
Views: 75,664
Posted By ross
Hi Muzza, I state that I have not looked at the...

Hi Muzza, I state that I have not looked at the TFMX routine used.
But I think jotd refers (EDIT: oops, just noticed that I basically wrote together with jotd :)) to the re-start or re-trigger of a...
Forum: Coders. Asm / Hardware 26 April 2022, 10:21
Replies: 18
Views: 1,455
Posted By ross
Interesting. I'm always available if there is...

Interesting.
I'm always available if there is any side effect of programmable modes :)
Although I suspect this sprite issue is due to something completely unrelated to HB.
Forum: support.Demos 22 April 2022, 10:40
Replies: 21
Views: 11,493
Posted By ross
This. Surely it would take less effort to...

This.

Surely it would take less effort to run the demo on higher spec machines, where you don't have to worry about available memory or CPU power.

Of course you could create a floppy (possibly...
Forum: Coders. Asm / Hardware 22 April 2022, 09:31
Replies: 18
Views: 1,455
Posted By ross
mmh, maybe solvable. But we have to talk about...

mmh, maybe solvable.
But we have to talk about it in PM because there are some technicalities to consider and it depends on how you plan to organize the (Copper) code.
Forum: Coders. Asm / Hardware 21 April 2022, 15:58
Replies: 18
Views: 1,455
Posted By ross
Nah, it is border :) (if there are no active...

Nah, it is border :) (if there are no active bitplanes technically it is 'border')
Forum: Coders. Asm / Hardware 21 April 2022, 11:28
Replies: 18
Views: 1,455
Posted By ross
Because with BRDRBLNK active this 'gap' is not...

Because with BRDRBLNK active this 'gap' is not really black but BLANK.
There is a voltage difference between the two and, depending on device calibration and setup, this can be easily spotted.
...
Forum: Coders. Asm / Hardware 21 April 2022, 06:55
Replies: 18
Views: 1,455
Posted By ross
This can be emulated with the WinUAE "Blacker...

This can be emulated with the WinUAE "Blacker than Black" setting in Host/Display.

A simple workaround in Amiga side could be to set BPLCON0/BPU=1 ($1001 instead of $1) and COLOR00=COLOR01=0...
Forum: Coders. Asm / Hardware 19 April 2022, 10:29
Replies: 19
Views: 1,742
Posted By ross
If not 'stable' at least 'predictable'. This is...

If not 'stable' at least 'predictable'. This is the minimum for emulation :)


To tell the truth I haven't looked at your code yet (I have my own specific code suitable for these tests, which is...
Forum: Coders. Asm / Hardware 18 April 2022, 14:17
Replies: 11
Views: 971
Posted By ross
From copper list: dc.w $104,$0024 This is a...

From copper list: dc.w $104,$0024
This is a pretty standard value (default for OS): PF2P=100 and PF1P=100
Why do you think it is an invalid value? Have you maybe misinterpreted the hexadecimal...
Forum: Coders. Asm / Hardware 18 April 2022, 11:43
Replies: 19
Views: 1,742
Posted By ross
Please wait, CIAB-TOD ALRM/IRQ behavior is under...

Please wait, CIAB-TOD ALRM/IRQ behavior is under test.
As usual it does not work exactly as expected and his behavior will soon be described and emulated properly.
(8520/6526 internals are not...
Forum: Coders. Asm / Hardware 16 April 2022, 09:42
Replies: 19
Views: 1,742
Posted By ross
Yeah, but I was starting from an assumption of an...

Yeah, but I was starting from an assumption of an even worse situation :)
If it's just copper driving the blitter *and* BLTPRI=0 then there's a good chance my method will work.
But if we add any...
Forum: support.WinUAE 15 April 2022, 18:54
Replies: 905
Views: 252,339
Posted By ross
Latest WinUAEs are right, SPR6DATB is not fetched...

Latest WinUAEs are right, SPR6DATB is not fetched cause OCS bug and low DDFSTRT.
No problem on ECS or AGA.
Forum: Coders. Asm / Hardware 15 April 2022, 09:09
Replies: 19
Views: 1,742
Posted By ross
This would collapse the discussion from the...

This would collapse the discussion from the beginning.


Copper using Blitter by definition would take up most of the line DMA cycles making a stable raster bar virtually impossible :)
Forum: Coders. Asm / Hardware 14 April 2022, 14:52
Replies: 19
Views: 1,742
Posted By ross
Yep, it is basically impossible to do in all...

Yep, it is basically impossible to do in all configurations, if not degrading as much as possible (and in any case it would never be enough ..).

Well, I think in any case it is more of an academic...
Forum: Coders. Asm / Hardware 14 April 2022, 14:44
Replies: 19
Views: 1,742
Posted By ross
That's right, and that's exactly the weak point I...

That's right, and that's exactly the weak point I had thought about too..

The idea in this case is to use a set of selected instructions that intertwine and pass the audio cycles unscathed.
But I...
Forum: Coders. Asm / Hardware 14 April 2022, 08:36
Replies: 19
Views: 1,742
Posted By ross
When I had to implement a stable raster in a...

When I had to implement a stable raster in a hostile environment (ie with the copper not modifiable), but known (ie where I am certain of the worst situation regarding DMA traffic), it was to use the...
Forum: Amiga scene 13 April 2022, 23:30
Replies: 27
Views: 2,423
Posted By ross
Another update into the Zone! (v3): - fixed...

Another update into the Zone! (v3):

- fixed for A500 ECS KS1.3 1MB chip
Forum: Amiga scene 13 April 2022, 22:38
Replies: 27
Views: 2,423
Posted By ross
I just got a report from a user: the demo (all...

I just got a report from a user: the demo (all versions) get stuck on startup on A500 ECS KS1.3 1MB chip.
WinUAE confirms this.
I think is something memory related.. I investigate.

EDIT: ah, got...
Forum: Amiga scene 13 April 2022, 22:23
Replies: 27
Views: 2,423
Posted By ross
Hi bifat, I shortened the time waiting for the...

Hi bifat, I shortened the time waiting for the RDY to something like 500ms.
If the RDY signal is before the deadline I continue otherwise I consider it valid regardless after the timeout.

No...
Forum: Amiga scene 13 April 2022, 15:15
Replies: 27
Views: 2,423
Posted By ross
Small update: - removed "press f1 to copy...

Small update:

- removed "press f1 to copy disk" message
- added support for floppy without RDY signal (ESCOM A1200 or modded PC floppy) [please test it]

Cheers.
Forum: Amiga scene 13 April 2022, 00:32
Replies: 27
Views: 2,423
Posted By ross
It might be worth noting that I never said the...

It might be worth noting that I never said the contrary.
Why did you quote my message?

I know perfectly well what the mailed floppy looks like (and I also referred to the missing data from track...
Forum: Amiga scene 12 April 2022, 11:01
Replies: 27
Views: 2,423
Posted By ross
A floppy by snail mail. But later Bifat made...

A floppy by snail mail.

But later Bifat made available an executable ("writetranshuman") that write to floppy in non-standard format.
EDIT: of course in emulation it can write to an MFM disk...
Forum: Coders. Asm / Hardware 12 April 2022, 09:45
Replies: 31
Views: 2,168
Posted By ross
Nice :)

Nice :)
Forum: Coders. Asm / Hardware 11 April 2022, 22:56
Replies: 31
Views: 2,168
Posted By ross
Of course, I just put simplified code to give the...

Of course, I just put simplified code to give the idea of the procedure :great
Forum: Amiga scene 11 April 2022, 18:43
Replies: 27
Views: 2,423
Posted By ross
Yes, you need a floppy that support READY signal....

Yes, you need a floppy that support READY signal.
So a no-no for ESCOM A1200.
Forum: Coders. Asm / Hardware 11 April 2022, 15:13
Replies: 31
Views: 2,168
Posted By ross
Usually nothing changes because it is almost...

Usually nothing changes because it is almost impossible for the same IRQ to arrive before you have finished the management code (if this happens it means that higher level IRQs have taken control and...
Forum: Coders. Asm / Hardware 11 April 2022, 10:40
Replies: 31
Views: 2,168
Posted By ross
That's right, that's exactly the purpose in the...

That's right, that's exactly the purpose in the case of testing a single CIA source and ignoring all the others.
It's the only case where the direct register test makes sense and that's why I put it...
Forum: Coders. Asm / Hardware 11 April 2022, 08:55
Replies: 31
Views: 2,168
Posted By ross
Yep, TOD counter is buggy. When TODMID...

Yep, TOD counter is buggy.

When TODMID change from 0x0F to 0x10 it transits temporarily to 0x00.
This of course has unpleasant side effects on ALARM :rolleyes
Forum: Coders. Asm / Hardware 10 April 2022, 20:01
Replies: 31
Views: 2,168
Posted By ross
Can't you just ignore it? You can read...

Can't you just ignore it?


You can read the ICR mask with cia.resource AbleICR()


FLAG is for floppy INDEX signal.
Forum: Coders. Asm / Hardware 10 April 2022, 17:48
Replies: 31
Views: 2,168
Posted By ross
Nope. Paula manages the physical CPU' IPL...

Nope.
Paula manages the physical CPU' IPL lines, RTE the internal SR' IP mask bits.
It keeps lines active until INTREQ is cleared.

But the CIA lines are external lines (IRQ 2 and 6) and...
Forum: Coders. Asm / Hardware 10 April 2022, 16:26
Replies: 31
Views: 2,168
Posted By ross
I hadn't checked LSP, in fact this is wrong :)...

I hadn't checked LSP, in fact this is wrong :) (or better, slower)

EDIT: re-checked ptplayer, it seems in the right order
Forum: Coders. Asm / Hardware 10 April 2022, 16:15
Replies: 31
Views: 2,168
Posted By ross
Hi Jobbo, it doesn't. CIAs work differently for...

Hi Jobbo, it doesn't.
CIAs work differently for acknowledging IRQs, it's just the ICR reading that cleans them up, unlike PAULA which needs explicit writing. This is why if you are interested in...
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