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Forum: Coders. Asm / Hardware 13 October 2019, 09:17
Replies: 13
Views: 526
Posted By chb
No. The number of lines per frame is the same.

No. The number of lines per frame is the same.
Forum: Amiga scene 09 October 2019, 15:47
Replies: 190
Views: 16,363
Posted By chb
Yep, I did some experiments with such a setup a...

Yep, I did some experiments with such a setup a while ago. The easiest way IMHO is to use a palette color for every even pixel and modify the green channel for every odd one. That means setting...
Forum: Coders. Asm / Hardware 30 September 2019, 19:32
Replies: 50
Views: 3,964
Posted By chb
Maybe not strictly UHRES related, but as it...

Maybe not strictly UHRES related, but as it concerns ECS and may (or not) give some clues about UHRES, I'll post it here:
I noticed something interesting when having a look with the UAE debugger at...
Forum: Coders. Asm / Hardware 27 September 2019, 09:53
Replies: 50
Views: 3,964
Posted By chb
Modulation of the LPF is something I was thinking...

Modulation of the LPF is something I was thinking of also. The output however may be a bit hard to predict (and varying between models). Best thing to check probably would be either an Amiga with an...
Forum: Coders. Asm / Hardware 24 September 2019, 12:17
Replies: 50
Views: 3,964
Posted By chb
This won't work, how could it? The maximum DMA...

This won't work, how could it? The maximum DMA sample rate* is tied to the horizontal frequency (max. two samples per channel are loaded at the beginning of each scanline). The first patch you linked...
Forum: Coders. Asm / Hardware 24 September 2019, 09:46
Replies: 50
Views: 3,964
Posted By chb
As the majority of these registers...

As the majority of these registers (pointers/modulo/identifiers) was probably never used by anything, and will not be used in the future, there shouldn't be a problem to reuse them in case you'd want...
Forum: Coders. Asm / Hardware 14 September 2019, 14:53
Replies: 50
Views: 3,964
Posted By chb
Right, I think UHRES is not that important! ;) ...

Right, I think UHRES is not that important! ;)


From the documentation it seems to me like it triggers a vblank somewhere in the middle of the standard display, to allow higher display refresh...
Forum: Coders. Asm / Hardware 14 September 2019, 14:39
Replies: 50
Views: 3,964
Posted By chb
Yeah, I know, but I did not realize that it's not...

Yeah, I know, but I did not realize that it's not limited to 56 kHz. :) And that it may not be hardwired to display sync if there is a possibility to use the standard sync timing regardless of...
Forum: Coders. Asm / Hardware 14 September 2019, 14:18
Replies: 50
Views: 3,964
Posted By chb
AFAIU, data bus content is not needed, only the...

AFAIU, data bus content is not needed, only the DRAM address bus value if it works like Gorf assumed. RGA value triggers the transfer mode of the VRAM, the address tells the VRAM with ROW to transfer...
Forum: Coders. Asm / Hardware 14 September 2019, 13:26
Replies: 50
Views: 3,964
Posted By chb
@Toni: Great find! To me from your investigation...

@Toni: Great find! To me from your investigation it looks like UHRES is fully implemented and works like documented so far.

Funny how long it has been sitting there without ever being used...
...
Forum: Coders. Asm / Hardware 13 September 2019, 18:35
Replies: 50
Views: 3,964
Posted By chb
Thank you very much for testing! Did you also set...

Thank you very much for testing! Did you also set bit 9 in DMACON to enable UHRES dma?
http://amiga-dev.wikidot.com/hardware:dmaconr


Hmm, according to the documentation $78 belongs to sprite...
Forum: Coders. Asm / Hardware 11 September 2019, 12:13
Replies: 50
Views: 3,964
Posted By chb
Yes, but the A2024 has it's own memory for a...

Yes, but the A2024 has it's own memory for a complete frame (unlike Graffiti etc.) and it is VRAM-based, so it might have been an related for UHRES or some parts of it were supposed to be used in the...
Forum: Coders. Asm / Hardware 09 September 2019, 10:00
Replies: 50
Views: 3,964
Posted By chb
True, I conveniently forgot about that. :) ...

True, I conveniently forgot about that. :)


If you refer to the sprite pointers: They come out twice in every UHRES cycle (so two sprite addresses for one BPL address). So one can speculate if...
Forum: Coders. Asm / Hardware 08 September 2019, 17:02
Replies: 50
Views: 3,964
Posted By chb
After thinking about it again I suppose you're...

After thinking about it again I suppose you're right, the whole setup makes only sense when chipram = vram (or at least a part of it). I guess it works the following way:

1) VRAM is essentially...
Forum: Coders. Asm / Hardware 08 September 2019, 09:59
Replies: 50
Views: 3,964
Posted By chb
I think there's a more mundane explanation to...

I think there's a more mundane explanation to UHRES than the mythical ranger chipset.

Commodore did in fact produce a VRAM device already in 1988, and that's been the A2024 monitor. Here...
Forum: Amiga scene 06 September 2019, 13:15
Replies: 190
Views: 16,363
Posted By chb
Musicline Editor has quite advanced wavetable...

Musicline Editor has quite advanced wavetable synthesis features, and there is also some replay routine for Eagle Player with source code ...
Forum: project.Amiga Game Factory 03 September 2019, 17:39
Replies: 34
Views: 1,407
Posted By chb
Yep, it's probably one of the most complex copper...

Yep, it's probably one of the most complex copper lists of all Amiga games... color gradients in foreground + background + perspective scroll, and everything scrolls horizontally and vertically, and...
Forum: Amiga scene 17 August 2019, 13:38
Replies: 799
Views: 41,300
Posted By chb
Never released, but planned (in cooperation with...

Never released, but planned (in cooperation with Sony and later Phillips):
https://en.wikipedia.org/wiki/Super_NES_CD-ROM

You cannot compare that directly, as the Amiga was not limited to sprites...
Forum: Amiga scene 17 August 2019, 12:44
Replies: 799
Views: 41,300
Posted By chb
That's a bit of a skewed comparison. The big...

That's a bit of a skewed comparison. The big difference is the amount of data needed: On the MD, a complete screen is 2k for character ram (1 playfield 16 colors, 320x200), and 32k on the Amiga, 15x...
Forum: Nostalgia & memories 15 August 2019, 14:58
Replies: 2,369
Views: 352,906
Posted By chb
There was an AdSpeed accelerator with IDE...

There was an AdSpeed accelerator with IDE controller, maybe it's your device?
https://www.bigbookofamigahardware.com/bboah/product.aspx?id=74

Anyway, wasn't there a name mentioned in the...
Forum: Nostalgia & memories 15 August 2019, 14:11
Replies: 2,369
Views: 352,906
Posted By chb
Could be a Gigatron Arriba 500 (internal 2.5" IDE...

Could be a Gigatron Arriba 500 (internal 2.5" IDE hard disk, controller in CPU socket):
http://amiga.resource.cx/adcoll/adcoll.pl?id=arriba&pg=4&lang=en

Or any other controller that fits into the...
Forum: Coders. General 13 August 2019, 22:39
Replies: 26
Views: 1,771
Posted By chb
The Atari 800 had character graphics, albeit not...

The Atari 800 had character graphics, albeit not as powerfull as the C64 and some of the consoles, mainly due to the fact that it did not have an extra color/attribute ram.

Have a look at this...
Forum: Coders. General 12 August 2019, 17:10
Replies: 26
Views: 1,771
Posted By chb
You could try to use blitter rotation like in...

You could try to use blitter rotation like in Brian the Lion (intro logo/bonus stage rotating platform) or the skull in World of Commodore/Sanity. AFAIR it is a variety of the shear/skew rotation....
Forum: Amiga scene 23 July 2019, 23:03
Replies: 799
Views: 41,300
Posted By chb
Yep, let's leave it at that.:) Would be...

Yep, let's leave it at that.:)

Would be great, but I fear it would neither help your time management nor mine. :D

If you refer to the AAA documentation: They describe pretty non-overlapping...
Forum: Amiga scene 22 July 2019, 22:48
Replies: 799
Views: 41,300
Posted By chb
No problem, good idea. Haynie is clearly...

No problem, good idea.

Haynie is clearly very enthusiastic about the Amiga (and the opposite about C= management), but in general not known for outrageous claims. My intention was to analyze what...
Forum: Amiga scene 20 July 2019, 18:08
Replies: 799
Views: 41,300
Posted By chb
Sorry, I think my statement was slightly...

Sorry, I think my statement was slightly confusing. VRAM has two ports: The DRAM port (that is addressed like standard DRAM) and a read-only video port. So for CPU and Blitter operations, VRAM and...
Forum: Amiga scene 20 July 2019, 15:21
Replies: 799
Views: 41,300
Posted By chb
[/QUOTE] It's the way VRAM works: At a single...

[/QUOTE]
It's the way VRAM works: At a single read access, a whole row (typically 1024 bits) is copied into an internal buffer, which is then output on the second port with an independent clock,...
Forum: Amiga scene 19 July 2019, 18:26
Replies: 799
Views: 41,300
Posted By chb
I also do not see how the 400-600 MB/s figure is...

I also do not see how the 400-600 MB/s figure is reached, however the linked document shows that it's not that far fetched: The dual VRAM system can do 1280x1024 in "chunky" mode (which is 16 bit per...
Forum: Amiga scene 18 July 2019, 13:07
Replies: 799
Views: 41,300
Posted By chb
Yes, in some way. The graffiti took the digital...

Yes, in some way. The graffiti took the digital RGBI from the Amiga's video connector and fed it to a RAMDAC (probably a generic VGA one), the palette data was transferred during some blanked...
Forum: Amiga scene 16 July 2019, 14:55
Replies: 799
Views: 41,300
Posted By chb
While the Archimedes is indeed impressive,...

While the Archimedes is indeed impressive, especially considering it gets its power from considerable simpler chips (CPU, VIDC, MEMC) than those in the A500, the specs do not tell the whole truth....
Forum: Amiga scene 07 July 2019, 23:58
Replies: 799
Views: 41,300
Posted By chb
But the Jaguar is a cartridge based system, so it...

But the Jaguar is a cartridge based system, so it would not need to load graphical assets and code into RAM? I think it's not fair to compare a disk-based and a cartridge-based system with the same...
Forum: Amiga scene 07 July 2019, 18:57
Replies: 799
Views: 41,300
Posted By chb
To be fair, that's more because Akiko is a really...

To be fair, that's more because Akiko is a really crappy solution for a chunky mode (read chunky data with the CPU, write chunky data to the Akiko registers with the CPU, read planar back with the...
Forum: Amiga scene 07 July 2019, 15:49
Replies: 799
Views: 41,300
Posted By chb
I think Sandruzzo is wrong here (if I understand...

I think Sandruzzo is wrong here (if I understand him correctly) - copper writes to hardware registers take exactly as many dma cycles as are needed to read the two words for address and value from...
Forum: Amiga scene 05 July 2019, 12:23
Replies: 30
Views: 2,899
Posted By chb
I think this is highly unlikely. First, according...

I think this is highly unlikely. First, according to Wikipedia OS/2 development was started in 1985, first version released in 1987. Assuming that by "bDos" they mean the BCPL/TRIPOS based AmigaDOS,...
Forum: Amiga scene 03 July 2019, 18:59
Replies: 799
Views: 41,300
Posted By chb
I'm not arguing that no one could have foreseen...

I'm not arguing that no one could have foreseen the need for a chunky mode, but hovertank and catacomb were EGA, which is planar, and Wolfenstein is from 1992, same year when AGA was released. But...
Forum: Amiga scene 01 July 2019, 13:05
Replies: 799
Views: 41,300
Posted By chb
I liked the A1200 - was my first Amiga after...

I liked the A1200 - was my first Amiga after using a PC/XT. And I remember it was received rather positively in the press at that time. And while it was not revolutionary, it was a quite well-rounded...
Forum: support.WinUAE 26 June 2019, 15:03
Replies: 12
Views: 631
Posted By chb
also not tested myself, but winuae should support...

also not tested myself, but winuae should support memwatches for all dma channels, see this thread:
http://eab.abime.net/showthread.php?t=77340
Forum: Nostalgia & memories 16 June 2019, 21:58
Replies: 2,369
Views: 352,906
Posted By chb
Thanks, I did not know that, after some googling...

Thanks, I did not know that, after some googling it really seems to be a usual frequency for arcade games. Also the PC-88/98 requires 24 kHz capable monitors. So that mode looks slightly less weird...
Forum: Nostalgia & memories 16 June 2019, 16:15
Replies: 2,369
Views: 352,906
Posted By chb
Is there a special reason Commodore included the...

Is there a special reason Commodore included the Super72 modes? It has a rather exotic horizontal frequency (23-24 kHz) that even a lot of their own monitors did not support, and it does not look...
Forum: Retrogaming General Discussion 10 June 2019, 13:42
Replies: 56
Views: 7,514
Posted By chb
There's at least one advantage: If you want only...

There's at least one advantage: If you want only shadows, you get the second palette half automatically - can be handy if you change colors a lot e.g. with the copper as you need only half of the...
Showing results 1 to 40 of 172

 
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