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Forum: Amiga scene 17 August 2019, 13:38
Replies: 784
Views: 36,985
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: 784
Views: 36,985
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: 2,308
Views: 342,086
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: 2,308
Views: 342,086
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: 1,262
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: 1,262
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 2,771
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: 784
Views: 36,985
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: 784
Views: 36,985
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: 569
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: 2,308
Views: 342,086
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: 2,308
Views: 342,086
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: 7,390
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...
Forum: Coders. AMOS 24 May 2019, 10:30
Replies: 17
Views: 1,236
Posted By chb
If you can live with 16 pix wide (or high? :)...

If you can live with 16 pix wide (or high? :) anyway, limited only in one dimension) textures, a technique like in the opening tunnel/hallway of Arte by Sanity is also possible: Use pre-scaled 16...
Forum: Retrogaming General Discussion 23 May 2019, 23:23
Replies: 11
Views: 599
Posted By chb
Hi, according to this page...

Hi,

according to this page (https://blog.amigaguru.com/lightguns-ahead/) at least the following games work with a light gun:


There's also some info in this thread on EAB here:...
Forum: Coders. Asm / Hardware 23 May 2019, 15:53
Replies: 45
Views: 3,627
Posted By chb
Hmm yeah, should work. At least if you use...

Hmm yeah, should work. At least if you use blitter nasty, the time for blitt and setup is deterministic, so it is possible to calculate at which line the blitt finishes. So in theory you could...
Forum: Coders. Asm / Hardware 23 May 2019, 15:21
Replies: 45
Views: 3,627
Posted By chb
I guess this was the scenario the blitter...

I guess this was the scenario the blitter finished disable bit was originally invented for - and it really echoes the beam racing techniques on the 2600. :) Take the y value of the line on the screen...
Forum: OT - General 19 May 2019, 11:51
Replies: 37
Views: 1,566
Posted By chb
McGeezer, while I would agree with you mostly...

McGeezer, while I would agree with you mostly regarding the technical side, your behavior over there at ppa was exceptionally rude and IMHO completely inappropriate. While there was a in parts...
Forum: Coders. Asm / Hardware 08 May 2019, 10:30
Replies: 195
Views: 24,514
Posted By chb
AND IT DOEZ NOT EVEN LOOK LIKE WOLFENSTEIN, THEY...

AND IT DOEZ NOT EVEN LOOK LIKE WOLFENSTEIN, THEY GOT ALL THE TEXTURES WRONG!!!!!111!1!11 :D

Seriously, people would have killed for something like this back in the day. Very impressive engine, and...
Forum: Coders. Asm / Hardware 07 May 2019, 13:08
Replies: 20
Views: 2,563
Posted By chb
Could it be this one? ...

Could it be this one?
http://aminet.net/package/dev/misc/CharMode


So I should have been more precise - you cannot drive the blitter directly with the blitter. ;) As to be able to change bg...
Forum: Coders. Asm / Hardware 07 May 2019, 10:54
Replies: 20
Views: 2,563
Posted By chb
Blitter cannot access custom chip address range,...

Blitter cannot access custom chip address range, so it also cannot write its own registers.
Forum: Coders. General 24 April 2019, 17:09
Replies: 2
Views: 632
Posted By chb
I haven't used it myself, but this here on eab...

I haven't used it myself, but this here on eab looks like it could match your criteria:
http://eab.abime.net/showthread.php?t=75785
Forum: Coders. Asm / Hardware 19 April 2019, 18:48
Replies: 45
Views: 3,627
Posted By chb
Sandruzzo, if I understand you correctly, you are...

Sandruzzo, if I understand you correctly, you are using a pristine restore buffer where you keep the original image so you do not have to save the background before blitting? And then you restore...
Forum: Coders. General 09 April 2019, 09:28
Replies: 152
Views: 10,467
Posted By chb
Yeah, but it's not chip ram. :D

Yeah, but it's not chip ram. :D
Forum: Coders. General 08 April 2019, 20:46
Replies: 152
Views: 10,467
Posted By chb
It's from some thread on eab, I didn't come up...

It's from some thread on eab, I didn't come up with it. But I like it, too. ;)



Yep, I think blitter is slower than using a word table - depends on available dma time. It's four passes with two...
Forum: Coders. General 08 April 2019, 15:17
Replies: 152
Views: 10,467
Posted By chb
I'd tend to disagree. First, while character...

I'd tend to disagree. First, while character movement is at steady 50 Hz, the animation is not, so flip to a buffer and blit from that buffer multiple times. Maybe store most often used frames in...
Forum: Coders. Asm / Hardware 07 April 2019, 17:52
Replies: 28
Views: 2,912
Posted By chb
According to Toni Wilen, vblank interrupt is at...

According to Toni Wilen, vblank interrupt is at the beginning of line 0 (exception: line 1 for A1000):
http://eab.abime.net/showpost.php?p=987075&postcount=192
Forum: Coders. Asm / Hardware 07 April 2019, 15:15
Replies: 28
Views: 2,912
Posted By chb
I was also thinking about such a thing at some...

I was also thinking about such a thing at some point. I was toying around with another approach that probably is less powerful and requires some cpu assistance, but may be easier to implement. It's...
Forum: Coders. General 28 March 2019, 16:28
Replies: 133
Views: 14,817
Posted By chb
The demo features some extremely impressive...

The demo features some extremely impressive effects (this infinite plasma stuff rotating zoomer is awesome), and the 3D scene is very nice, but is done with a pre-calculated vector anim, like in...
Forum: Coders. General 04 March 2019, 12:14
Replies: 61
Views: 10,048
Posted By chb
That's probably true, but I'm still wondering why...

That's probably true, but I'm still wondering why they did not include a cheap-and-dirty 16 bit mode - just pass the data to the external RAMDAC, no CLUT involved. If you want it really super simple...
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