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Forum: Coders. Asm / Hardware Yesterday, 23:15
Replies: 43
Views: 1,494
Posted By ross
To use only the lower part for the pointer...

To use only the lower part for the pointer registers, defining a fixed memory 'block' with the upper part (so actually is 64k boundaries, as a direct 16 bit value).
Forum: News Yesterday, 21:55
Replies: 51
Views: 2,052
Posted By ross
What bad guy you are :evilgrin Use the...

What bad guy you are :evilgrin

Use the sector label area to save the high-score, this way the ADF cannot maintain it but a real floppy :D
Forum: Coders. Asm / Hardware Yesterday, 19:34
Replies: 43
Views: 1,494
Posted By ross
CPU not having to wait, but copper yes :D

CPU not having to wait, but copper yes :D
Forum: Coders. Asm / Hardware Yesterday, 19:32
Replies: 43
Views: 1,494
Posted By ross
Since this is not the first time this case has...

Since this is not the first time this case has been dealt with and usually concerns the A500, could it be that only some old (Fat)Agnus revision has this problem?
The ECS and AGA machines seem...
Forum: Coders. Asm / Hardware Yesterday, 19:12
Replies: 43
Views: 1,494
Posted By ross
Where did you read such a thing? A blitter wait...

Where did you read such a thing?
A blitter wait is always mandatory before starting a new operation (nasty mode active or not, copper driven or not).
Forum: Coders. Asm / Hardware Yesterday, 17:52
Replies: 43
Views: 1,494
Posted By ross
Thanks, so some work for Toni ;) ...

Thanks, so some work for Toni ;)




There is a big difference.
When copper DMA fetches instruction/data from chip-memory, data is from now inside Agnus (copper MOVE already specifies a...
Forum: News Yesterday, 15:27
Replies: 51
Views: 2,052
Posted By ross
No, to a certain extent the two FS can live...

No, to a certain extent the two FS can live together.
So block 880 works for both.
And the regular DOS/0 file is really an (interesting!) trick :)



Ah, mr.spiv victory! Two disks required :)...
Forum: Coders. Asm / Hardware Yesterday, 15:16
Replies: 43
Views: 1,494
Posted By ross
You are absolutely right, it is impossible that...

You are absolutely right, it is impossible that the list is completely static and also that some of the fields are not modified.

So this is a difficult answer, real tests should be made and...
Forum: News Yesterday, 11:58
Replies: 51
Views: 2,052
Posted By ross
Yes, I had noticed it, a classy touch :cool

Yes, I had noticed it, a classy touch :cool
Forum: Coders. Asm / Hardware Yesterday, 08:27
Replies: 43
Views: 1,494
Posted By ross
Not from speed perspective (even if you are...

Not from speed perspective (even if you are correct from 'physical' accesses perspective, I've simplified to grasp the concept :))

Take this CMOVE, a blitter operation start: dc.w $0058,$0041
How...
Forum: News 02 August 2020, 23:27
Replies: 51
Views: 2,052
Posted By ross
I had a look at the ADF tonight. I like it! I...

I had a look at the ADF tonight. I like it!
I appreciate the protection, the file-system (a DOS/1 faked to be able to boot on KS1.x, I also did something similar in my tests :)),
the loader and...
Forum: Coders. Asm / Hardware 02 August 2020, 19:46
Replies: 43
Views: 1,494
Posted By ross
Unfortunately there is a big disadvantage in...

Unfortunately there is a big disadvantage in doing this: you cannot do sync effects with copper (well, there is a method to alleviate this but is a bit complex), because you cannot know where the...
Forum: Coders. Asm / Hardware 02 August 2020, 18:43
Replies: 43
Views: 1,494
Posted By ross
I really think so, especially if you have code in...

I really think so, especially if you have code in chip or slow ram.
Copper is very fast at writing in blitter registers, with only two bus/mem accesses.
Using 68000 code in a quick way: move.w...
Forum: Coders. Asm / Hardware 02 August 2020, 18:20
Replies: 12
Views: 984
Posted By ross
Thanks, concise and clear compendium.

Thanks, concise and clear compendium.
Forum: Coders. Asm / Hardware 02 August 2020, 18:03
Replies: 43
Views: 1,494
Posted By ross
More on what roondar wrote here. In this...

More on what roondar wrote here.

In this game the blitter objects would be better defined in the broad sense as "copper objects".
CPU 'construct' the copper list dynamically as a queue where next...
Forum: Coders. General 26 July 2020, 10:42
Replies: 54
Views: 8,238
Posted By ross
In code there is a check for index0 and a note...

In code there is a check for index0 and a note skip. So seems index for period extraction is shifted up by one. But I haven't checked all over.
Value repeated could be to help compressors, lz...
Forum: Coders. General 26 July 2020, 01:28
Replies: 54
Views: 8,238
Posted By ross
Code: ComputePeriods: ...

Code:
ComputePeriods:
lea mt_PeriodTable-Base(a4),a0
lea .seeds(pc),a1
moveq #0,d3
moveq #16-1,d5 ;16 tuning tables
.tloop:
move.w (a1)+,d0 ;get 'patched' semitone-up period *64...
Forum: Coders. General 25 July 2020, 23:36
Replies: 54
Views: 8,238
Posted By ross
Ok, I've extended the brute force method to the...

Ok, I've extended the brute force method to the full Period table and a common twelfth2 const exist!

$F1A8,$E2B4
$F1A8,$E159
$F1A8,$DF8C
$F1A8,$DE31
$F1A8,$DC64
$F1A8,$DAC2
$F1A8,$D977...
Forum: Coders. General 25 July 2020, 20:03
Replies: 54
Views: 8,238
Posted By ross
Maybe also something can be done for the 'seeds'....

Maybe also something can be done for the 'seeds'.
Fine semitones are all related.
And, as proved, some different 'twelfth root of 2' consts can be used.
Forum: Coders. General 25 July 2020, 19:48
Replies: 54
Views: 8,238
Posted By ross
Great! :great Just because I'm...

Great!

:great



Just because I'm curious and want to do a better and exhaustive answer to 8bitbubsy (and to me;)) I've made a check for the Blueberry's used values, and the the reason is less...
Forum: Coders. General 25 July 2020, 17:26
Replies: 54
Views: 8,238
Posted By ross
Wait... manually is boring ;) #$e2b3 is...

Wait... manually is boring ;)

#$e2b3 is simply what Siekmanski call BasePeriod_907 (/64 is 906.8 in this Blueberry's good approximation).
So a semitone upper the 856 base for PT.

#61865 is...
Forum: Coders. General 25 July 2020, 16:33
Replies: 54
Views: 8,238
Posted By ross
This is exactly what Siekmanski's code do ;)

This is exactly what Siekmanski's code do ;)
Forum: support.Hardware 25 July 2020, 12:00
Replies: 5
Views: 360
Posted By ross
Of course you can make it have higher horizontal...

Of course you can make it have higher horizontal frequencies (on AGA you can program it very freely and the limits are very mild) but the problem of the limited video bandwidth (28MHz) remain, so I...
Forum: support.Hardware 23 July 2020, 14:56
Replies: 10
Views: 451
Posted By ross
It can also be viewed online here:...

It can also be viewed online here: http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node00A4.html
not a very comfortable mode :)
Forum: support.Hardware 22 July 2020, 19:28
Replies: 5
Views: 360
Posted By ross
Sure you can: ...

Sure you can:
http://www.winnicki.net/amiga/memmap/VPOSR.html

Internal counter is 11 bit so a theoretical 2048 lines.
But of course the more lines you have the more the vertical frequency drops...
Forum: Amiga scene 22 July 2020, 18:54
Replies: 173
Views: 8,744
Posted By ross
:laughing :great

:laughing :great
Forum: Amiga scene 22 July 2020, 18:27
Replies: 173
Views: 8,744
Posted By ross
Do you like the Desert Apple? :cool

Do you like the Desert Apple?

:cool
Forum: Amiga scene 22 July 2020, 12:02
Replies: 173
Views: 8,744
Posted By ross
Thanks for the tests. Maybe soon a new...

Thanks for the tests.

Maybe soon a new teaser with the new encoding.
Forum: support.WinUAE 21 July 2020, 16:05
Replies: 8
Views: 712
Posted By ross
Hi, a question about the bettter handling for the...

Hi, a question about the bettter handling for the 60Hz resolution, by banging BEAMCON0 or faking with VHPOSW.

Usually I launch a Quickstart configuration, that open a windows in the default...
Forum: support.WinUAE 21 July 2020, 11:25
Replies: 33
Views: 928
Posted By ross
I'm eating apples. I found a bad one. :p

I'm eating apples.

I found a bad one.

:p
Forum: Amiga scene 20 July 2020, 21:37
Replies: 173
Views: 8,744
Posted By ross
No idea. If it support some raw formats, it...

No idea.
If it support some raw formats, it could be adapted.



:great
Forum: Amiga scene 20 July 2020, 20:45
Replies: 173
Views: 8,744
Posted By ross
Yes, this is the point, a custom format but...

Yes, this is the point, a custom format but writable with a real floppy.
I had been very clear on this.
Forum: Amiga scene 20 July 2020, 20:28
Replies: 173
Views: 8,744
Posted By ross
Yes, thanks.

Yes, thanks.
Forum: Amiga scene 20 July 2020, 20:08
Replies: 173
Views: 8,744
Posted By ross
Great :) Technicality: in the video line...

Great :)

Technicality:
in the video line 262 I change Agnus VHPOSW register making it think it's on the line 312.
So I have to be sure to use Long Frame mode.

I made this choice to have the...
Forum: support.WinUAE 20 July 2020, 19:33
Replies: 8
Views: 712
Posted By ross
Toni did tests and made it clear that even a...

Toni did tests and made it clear that even a 'jump' to the bottom line in OCS works without problems.

Thanks!
Forum: Amiga scene 20 July 2020, 19:24
Replies: 173
Views: 8,744
Posted By ross
Well, Superman you are a good testbed :) I...

Well, Superman you are a good testbed :)

I make a different ADF for you, hoping not to break for others (apparently works for them all).

Toni is testing with a scope, results:
'Normal' NTSC on...
Forum: Amiga scene 20 July 2020, 19:01
Replies: 173
Views: 8,744
Posted By ross
Could you try Dynablaster? If i'm not wrong...

Could you try Dynablaster?

If i'm not wrong BC kid use something like 57Hz..
Forum: Amiga scene 20 July 2020, 18:57
Replies: 173
Views: 8,744
Posted By ross
I think in the end 200KB will be available :) ...

I think in the end 200KB will be available :)


I stream and depack in real time.

Any suggestions are welcome but probably the data management part is where we do best.
There are several...
Forum: Amiga scene 20 July 2020, 18:03
Replies: 173
Views: 8,744
Posted By ross
Of course there would be a WHDLoad version in the...

Of course there would be a WHDLoad version in the case of a custom disc format (exactly like for games).


---

OSSC (open source scan converter) says 261p and 15.62KHz and 59.86Hz. (Scope shows...
Forum: Amiga scene 20 July 2020, 17:33
Replies: 173
Views: 8,744
Posted By ross
Too early to say with precision, right now plenty...

Too early to say with precision, right now plenty of chip ram available (>256Kb) but it depends on the later added blitplane/sprite effects, not much (100k?) of the 512 Kb 'fast' ram because of big...
Showing results 1 to 40 of 2721

 
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