English Amiga Board


Go Back   English Amiga Board > Search Forums

Showing results 1 to 40 of 283
Search took 0.04 seconds.
Search: Posts Made By: chb
Forum: Coders. Asm / Hardware Yesterday, 16:26
Replies: 43
Views: 1,215
Posted By chb
Ah, ok. AFAIK the only CPU WinUAE emulates...

Ah, ok. AFAIK the only CPU WinUAE emulates cycle-exact is the 68000; for the 68020 and upwards the emulation is less precise (because it is much harder and mostly undocumented). But I don't know if...
Forum: Coders. Asm / Hardware Yesterday, 15:53
Replies: 43
Views: 1,215
Posted By chb
Well, it was some nice puzzle. :) Interesting...

Well, it was some nice puzzle. :) Interesting that the table access is so slow, what was your configuration?
Forum: Coders. Asm / Hardware Yesterday, 14:44
Replies: 43
Views: 1,215
Posted By chb
EDIT: Did not see your last post :) Thanks...

EDIT: Did not see your last post :)

Thanks for the code, makes it clearer now.

Can a2 be saved and restored after mixing? I do not see it used anywhere in your code.

I give it a last try.:)...
Forum: Coders. Asm / Hardware 20 October 2020, 15:57
Replies: 43
Views: 1,215
Posted By chb
Ok, I'll give it another try. Let's assume...

Ok, I'll give it another try. Let's assume frac(n+1) = frac(n) + delta_frac in every step, frac(0)=0. I hope that's what you are using.

We could use a different format for frac - we use 24 bit and...
Forum: Coders. Asm / Hardware 20 October 2020, 13:06
Replies: 43
Views: 1,215
Posted By chb
Hmm, what is your definition of "gigantic" for a...

Hmm, what is your definition of "gigantic" for a LUT? If you can live with 64k and 8 bit fraction resolution, the following might work (not tested):

move.w (a3,d2.l),d3 ; d3.w = 2x 8-bit...
Forum: Coders. General 13 October 2020, 13:10
Replies: 779
Views: 62,603
Posted By chb
Those demos are certainly impressive; however,...

Those demos are certainly impressive; however, they rely on field (temporal) interlace to increase the number of background colors - I am not sure if that works out well in practice or if the flicker...
Forum: Nostalgia & memories 10 October 2020, 10:28
Replies: 312
Views: 12,991
Posted By chb
The Acorn wasn't really a designated game...

The Acorn wasn't really a designated game machine, so the more interesting things were coming out rather in the application/tools/development/education sector. But e.g. Star Fighter 3000 was...
Forum: Nostalgia & memories 08 October 2020, 22:52
Replies: 292
Views: 9,323
Posted By chb
There are 16 real palette colors (12 bit each),...

There are 16 real palette colors (12 bit each), the other 240 are derived from that in a rather complicated way (RGB bits from palette colors are substituted with bits from the index number). In...
Forum: Nostalgia & memories 05 October 2020, 11:59
Replies: 292
Views: 9,323
Posted By chb
You forgot those long file names! ;) IIRC only...

You forgot those long file names! ;) IIRC only with Windows 95 that unnecessary luxury feature was coming to the PC... (exotic operating systems notwithstanding).

Not sure if I would call the...
Forum: Nostalgia & memories 03 October 2020, 09:54
Replies: 312
Views: 12,991
Posted By chb
According to this site...

According to this site (http://www.vgamuseum.info/index.php/companies/itemlist/category/26-number-nine-visual-technology), the Number Nine Revolution 512x32 was released in 1984. Quite interesting...
Forum: support.Hardware 21 September 2020, 16:32
Replies: 5
Views: 362
Posted By chb
To set up a custom Workbench, you might try the...

To set up a custom Workbench, you might try the HighGFX (http://aminet.net/package/driver/moni/HighGFX40_6) package; also the there's a Super72 (http://aminet.net/package/driver/moni/Super72-V2)...
Forum: Amiga scene 18 September 2020, 10:21
Replies: 23
Views: 1,748
Posted By chb
I think there's a misunderstanding what a "purely...

I think there's a misunderstanding what a "purely determinated by technical needs" means in this term. You define it in a very narrow sense it means only things for which no other solution exists....
Forum: Amiga scene 17 September 2020, 15:38
Replies: 23
Views: 1,748
Posted By chb
AFAIU that does not matter as long as the...

AFAIU that does not matter as long as the motivation for that design is a pure technical one.

Again, AFAIU the design can only be protected if its motivated by something else than a technical...
Forum: Amiga scene 17 September 2020, 14:09
Replies: 23
Views: 1,748
Posted By chb
At least in Germany designs in the sense of...

At least in Germany designs in the sense of circuit design (meaning the design is fulfilling an exclusively technical function, not an aesthetical one) are not protected by copyright. That's what I...
Forum: Amiga scene 17 September 2020, 09:46
Replies: 23
Views: 1,748
Posted By chb
It's probably not that clear; AFAIK at least here...

It's probably not that clear; AFAIK at least here in Germany an electronic circuit layout is not protected by copyright law. There are possibilities to protect a design (patents, utility patents),...
Forum: Coders. Asm / Hardware 11 September 2020, 11:38
Replies: 57
Views: 3,015
Posted By chb
Ok, I think I got it thanks to this thread on the...

Ok, I think I got it thanks to this thread on the Atari-Forum (https://www.atari-forum.com/viewtopic.php?f=68&t=30296):

According to that discussion, andi to ccr indeed does three read cycles...
Forum: Coders. Asm / Hardware 09 September 2020, 12:42
Replies: 57
Views: 3,015
Posted By chb
I think it is too exotic, the NXP manual does not...

I think it is too exotic, the NXP manual does not even seem to mention immediate as destination operand. :) In the NXP manual, static to register is listed with 18 clock cycles and 4 memory cycles in...
Forum: Coders. Asm / Hardware 09 September 2020, 11:48
Replies: 57
Views: 3,015
Posted By chb
Ooops :) but then the neogeo dev wiki...

Ooops :) but then the neogeo dev wiki (https://wiki.neogeodev.org/index.php?title=68k_instructions_timings) and the NXP 68000 manual list it with three memory read cycles, compared to two for andi to...
Forum: Coders. Asm / Hardware 09 September 2020, 10:34
Replies: 57
Views: 3,015
Posted By chb
Yeah, but andi to ccr is three, if I'm not...

Yeah, but andi to ccr is three, if I'm not completely mistaken ;)
Forum: Coders. Asm / Hardware 09 September 2020, 09:41
Replies: 57
Views: 3,015
Posted By chb
Hmm, would a btst Dn,#$FF work? It's supposed...

Hmm, would a
btst Dn,#$FF
work? It's supposed to be modulo 8, so for any content of Dn it should clear the Z flag.

It's two words, unfortunately, but that's still a word less than andi to ccr.
Forum: Nostalgia & memories 08 September 2020, 17:06
Replies: 33
Views: 2,521
Posted By chb
The X68000 is a very capable game machine,...

The X68000 is a very capable game machine, without question, but the operating system is rather primitive (Human68k is an MS-DOS look-alike), and while the hardware supports very high resolutions...
Forum: Nostalgia & memories 08 September 2020, 11:12
Replies: 33
Views: 2,521
Posted By chb
AFAIK the Amiga was very rare in Japan,...

AFAIK the Amiga was very rare in Japan, especially in its role as a game/home computer. But apparently it had some niches in the animation/video market.

There's an old thread about Japanese games...
Forum: Coders. Asm / Hardware 05 September 2020, 15:40
Replies: 243
Views: 167,955
Posted By chb
That's interesting! Just to make sure I...

That's interesting! Just to make sure I understand that correctly:

a) Direct colors will be picked from a 3+4 (08 is transparent) color palette like on a 2+2 plane DPF? Also using only palette...
Forum: Retrogaming General Discussion 27 August 2020, 14:44
Replies: 179
Views: 9,926
Posted By chb
Just a small observation concerning blitter...

Just a small observation concerning blitter performance: The bubbles are 16 pixels wide (and high) and fall only in vertical direction, so for every second row they are perfectly aligned to a 16...
Forum: Coders. General 13 August 2020, 13:16
Replies: 27
Views: 1,867
Posted By chb
On AGA you can have pretty much every pixel size...

On AGA you can have pretty much every pixel size you want, but you cannot get past the 57 or so CMOVEs per scanline. So a 200pix wide 2x2 copper chunky is possible, but not a 256 or 320pix wide one....
Forum: Retrogaming General Discussion 07 August 2020, 12:30
Replies: 64
Views: 4,010
Posted By chb
AFAIK Thalion's biggest hit was A320, as dull as...

AFAIK Thalion's biggest hit was A320, as dull as it appears to most people here probably:



Probably also one of the Amiga games with the best sales-to-piracy-ratio. As the Amiga was the first...
Forum: support.Hardware 30 July 2020, 13:16
Replies: 3
Views: 222
Posted By chb
AFAIK the German version had 512k of real fast...

AFAIK the German version had 512k of real fast mem instead of ranger/slow-mem in the Fat Agnus-based US version, so it should perform slightly better in its base configuration.
Forum: Nostalgia & memories 25 July 2020, 23:43
Replies: 216
Views: 23,037
Posted By chb
IMHO a nice option would have been an independent...

IMHO a nice option would have been an independent COP3LC register for blitter queuing that would not have been reset at VBlank. So like having a list of CMOVEs that are executed when the copper isn't...
Forum: Nostalgia & memories 22 July 2020, 13:30
Replies: 216
Views: 23,037
Posted By chb
AFAIK the hackish way the additional color...

AFAIK the hackish way the additional color registers were added is necessitated by the limited RGA bus address space (it only supports up to 256 16-bit registers). I guess it would have been quite...
Forum: Hardware mods 21 July 2020, 14:37
Replies: 4
Views: 737
Posted By chb
As the MB40978P-SH is exactly the same chip as on...

As the MB40978P-SH is exactly the same chip as on the 2.1 revision pictured here (http://amiga.resource.cx/exp/firecracker), and your expansion board fits into three identical-looking sockets, my...
Forum: Coders. Asm / Hardware 06 July 2020, 15:02
Replies: 225
Views: 24,798
Posted By chb
Yes, you can have only 128 individual background...

Yes, you can have only 128 individual background pixels, at least if you don't reload the SPRDAT registers (roondar's approach), which is totally flexible, but costs you quite some performance.
...
Forum: Coders. Asm / Hardware 06 July 2020, 13:04
Replies: 225
Views: 24,798
Posted By chb
Just on a side note: Apidya does have parallax...

Just on a side note: Apidya does have parallax scrolling in the last level (the one with the cogwheels in the bg), and it's pretty impressive - a multiplexed 4 color sprite background, which is even...
Forum: Amiga scene 01 July 2020, 11:25
Replies: 45
Views: 2,570
Posted By chb
It's actually slightly more convoluted. The A500...

It's actually slightly more convoluted. The A500 was the original cost-reduced design. The 2000 exists in two versions: the early A2000-A was designed by Commodore Germany. It was heavily based on...
Forum: Coders. General 31 May 2020, 21:28
Replies: 29
Views: 3,336
Posted By chb
For a span filler and solid polygons the blitter...

For a span filler and solid polygons the blitter is in clearing mode (D only)*, so the idle cycles become relevant, meaning the CPU can work at full speed in parallel to the blitter here if no other...
Forum: Coders. General 31 May 2020, 09:30
Replies: 29
Views: 3,336
Posted By chb
If you by "spinning up the Blitter thousand times...

If you by "spinning up the Blitter thousand times per frame" mean a blitter-based span filler, I do not think that's a feasible approach on the Amiga. For pure clear the CPU is as fast as the blitter...
Forum: Coders. General 31 May 2020, 05:43
Replies: 29
Views: 3,336
Posted By chb
You can do a vertical fill by using 2x the target...

You can do a vertical fill by using 2x the target buffer as source, one line apart, and then use an XOR minterm (but no fill mode). Like D = D ^ (D - 1). It then works like a horizontal blitter fill,...
Forum: Coders. General 02 May 2020, 19:41
Replies: 2
Views: 597
Posted By chb
AFAIU the workings of blitter idle cycles were...

AFAIU the workings of blitter idle cycles were largely undocumented, they appear in some early errata to the HRM, but the later eiditons of the HRM seems to omit them completely:...
Forum: Retrogaming General Discussion 26 April 2020, 20:09
Replies: 26
Views: 2,103
Posted By chb
No problem, I guess I should have been better...

No problem, I guess I should have been better aware of the fact that this is the English Amiga Board after all and that there may be certain sensitivities. ;)
Forum: Retrogaming General Discussion 26 April 2020, 19:27
Replies: 26
Views: 2,103
Posted By chb
And you might want to educate yourself a bit...

And you might want to educate yourself a bit about of the use of irony - it might indicated by the utilization of things like smileys. Also that a sentence is followed by another one beginning with...
Forum: support.Hardware 26 April 2020, 09:59
Replies: 23
Views: 1,724
Posted By chb
There's also a manual on the...

There's also a manual on the BigBookOfAmigaHardware-Page for the 1230-IV:
https://www.bigbookofamigahardware.com/bboah/product.aspx?id=1707

Just a warning, it gives a https certificate error,...
Showing results 1 to 40 of 283

 
Forum Jump

All times are GMT +2. The time now is 17:50.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Page generated in 0.14247 seconds with 10 queries