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Forum: support.Apps 18 April 2015, 02:58
Replies: 17
Views: 2,866
Posted By mc6809e
I wonder what these videos would look like if the...

I wonder what these videos would look like if the Amiga designers had stuck with using an YIQ or YUV scheme instead of RGB. Probably much better (assuming proper coding).

Maybe they should have...
Forum: support.Hardware 10 March 2015, 12:15
Replies: 42
Views: 3,392
Posted By mc6809e
The first is just a student's report drawn from...

The first is just a student's report drawn from other sources. Nothing there really.

The second is a test of multipath, but at the smallest tested interval of 2 microseconds, the interfering path...
Forum: support.Hardware 09 March 2015, 20:42
Replies: 42
Views: 3,392
Posted By mc6809e
The idea that the OFDM of DVB-T is multipath...

The idea that the OFDM of DVB-T is multipath resistant is mostly a myth.

It should be obvious that mixing the OFDM signal with a carrier re-narrows the signal and the multipath advantage almost...
Forum: support.Hardware 07 March 2015, 03:36
Replies: 42
Views: 3,392
Posted By mc6809e
Nearly the same signal. The only thing PAL...

Nearly the same signal.

The only thing PAL did was invert the chroma phase of every other line so that any shift in one line could be compensated for by the next line.

It did result in reducing...
Forum: support.Hardware 06 March 2015, 19:39
Replies: 42
Views: 3,392
Posted By mc6809e
PAL flicker is miserable. I don't know how anyone...

PAL flicker is miserable. I don't know how anyone can stand it.
Forum: Amiga scene 02 March 2015, 21:59
Replies: 34
Views: 8,927
Posted By mc6809e
Excellent, Bean! Thanks!

Excellent, Bean! Thanks!
Forum: Amiga scene 02 March 2015, 05:57
Replies: 34
Views: 8,927
Posted By mc6809e
Sorry ;) Oh, I just meant that since...

Sorry ;)



Oh, I just meant that since the CPU is usually busy with other calculations of all sorts while the blitter is less taxed, adding a cross product calculation for a surface normal plus...
Forum: Amiga scene 01 March 2015, 21:04
Replies: 34
Views: 8,927
Posted By mc6809e
Thanks for your thoughts, Beany. Appreciated. But...

Thanks for your thoughts, Beany. Appreciated. But by my math, your cube example actually argues for doing three single-bitplane fills.

Doing three separate one-bitplane fills I get:

14 words x...
Forum: Amiga scene 26 February 2015, 06:08
Replies: 34
Views: 8,927
Posted By mc6809e
Ah, that final statement suggests to me that I...

Ah, that final statement suggests to me that I maybe I haven't been clear enough.

What I'm talking about is first drawing one filled single bitplane polygon of a larger object in a buffer. Then by...
Forum: Amiga scene 25 February 2015, 19:36
Replies: 34
Views: 8,927
Posted By mc6809e
That seems like it would often take more time....

That seems like it would often take more time. There's the larger off screen buffer to clear. And twice as much memory to cover with the fill. I can see how it might be competitive for small polys,...
Forum: Amiga scene 25 February 2015, 03:46
Replies: 34
Views: 8,927
Posted By mc6809e
But you can't usually render a poly directly to a...

But you can't usually render a poly directly to a frame buffer unless it's the only poly to be rendered, unless I'm missing something.

The best way, IMO, is to first render/fill the poly to a...
Forum: support.Games 22 February 2015, 03:48
Replies: 19
Views: 4,408
Posted By mc6809e
Oh it's easy to write a chess playing program...

Oh it's easy to write a chess playing program that takes just a few seconds to make a decision.

Those decisions won't be good ones, but they can be made quickly.
Forum: support.Games 20 February 2015, 08:00
Replies: 19
Views: 4,408
Posted By mc6809e
The CPU of the Amiga would probably limit...

The CPU of the Amiga would probably limit stockfish's rating.

If Chessmaster 2100 was written in assembler, it might actually be a better player on the Amiga than stockfish's compiled c++ running...
Forum: Nostalgia & memories 18 February 2015, 21:49
Replies: 131
Views: 13,158
Posted By mc6809e
The C128 stunk because it confused consumers'...

The C128 stunk because it confused consumers' perception of Commodore's commitment to the Amiga.

How's that?
Forum: Retrogaming General Discussion 07 February 2015, 06:19
Replies: 57
Views: 7,030
Posted By mc6809e
You're not too dumb. The problem is that...

You're not too dumb.

The problem is that you're aware of more important things and those things distract you.
Forum: Nostalgia & memories 04 February 2015, 19:39
Replies: 1,890
Views: 257,620
Posted By mc6809e
I think the designers believed that more complex...

I think the designers believed that more complex stereo effects would be done by simply duplicating most channel settings and altering the volume on pairs of channels to place the audio in space.
...
Forum: support.Hardware 25 January 2015, 15:48
Replies: 11
Views: 1,266
Posted By mc6809e
The problem could be a marginal IC or other...

The problem could be a marginal IC or other component that fails as it heats up, often due to a high resistance internal short.

Carefully touch the top of each IC to see if its VERY hot. Don't...
Forum: support.WinUAE 22 January 2015, 08:12
Replies: 305
Views: 113,208
Posted By mc6809e
I noticed while running the visual debugger that...

I noticed while running the visual debugger that a DMA slot that should typically be available to the CPU/blitter now appears to be unavailable.

The unavailable slot appears to be an extra...
Forum: Retrogaming General Discussion 22 January 2015, 05:38
Replies: 35
Views: 4,213
Posted By mc6809e
Blame superior Atari marketing in the USA. I...

Blame superior Atari marketing in the USA. I remember many of my friends excitedly buying STs a few months before the Amiga came out.

I tried to tell them to wait, but Atari was successfully...
Forum: Retrogaming General Discussion 21 January 2015, 20:36
Replies: 743
Views: 62,577
Posted By mc6809e
Excellent point! I think this is a human...

Excellent point!

I think this is a human factors issue rather than a technical issue.

Put yourself in the place of a programmer in 1985 considering whether or not to learn the technical details...
Forum: Coders. Asm / Hardware 12 January 2015, 06:46
Replies: 5
Views: 1,091
Posted By mc6809e
Intentionally using some of the slower channel...

Intentionally using some of the slower channel combinations might improve concurrency in some situations and improve overall speed.

For example, a B->D copy has one idle cycle. These idle cycles...
Forum: support.Hardware 11 January 2015, 11:08
Replies: 9
Views: 2,457
Posted By mc6809e
Phosphors decay too quickly for there to be much...

Phosphors decay too quickly for there to be much difference in brightness (though non-interlace has always looked brighter to me for some reason -- perhaps it has something to due with flicker fusion...
Forum: Coders. Asm / Hardware 11 January 2015, 02:46
Replies: 5
Views: 1,091
Posted By mc6809e
Ideally the blitter would always yield to the CPU...

Ideally the blitter would always yield to the CPU since the CPU if need be can always be stopped with a STOP instruction.

Perhaps there was some technical reason for the three cycle rule. At least...
Forum: Coders. Asm / Hardware 08 January 2015, 08:28
Replies: 21
Views: 5,701
Posted By mc6809e
Yep, but that would happen anyway even if they...

Yep, but that would happen anyway even if they were overlapped.

I think I see what you're getting at, though. By using attached mode one can reduce the number of palette entries used by sprites in...
Forum: Coders. Asm / Hardware 08 January 2015, 05:14
Replies: 21
Views: 5,701
Posted By mc6809e
One can do even better by putting the sprites in...

One can do even better by putting the sprites in attached mode, but being careful not to overlap them.

In that case the even sprites get palette entries 17, 18, 19 and the odd sprites get 20, 24,...
Forum: Retrogaming General Discussion 06 January 2015, 23:46
Replies: 329
Views: 35,026
Posted By mc6809e
Does anyone have a fast blitter bob scaling...

Does anyone have a fast blitter bob scaling routine?

I'm thinking some hybrid approach where various pre-scaled bobs are stored with the blitter doing one final set of stretches to get the exact...
Forum: Coders. Asm / Hardware 06 January 2015, 01:44
Replies: 21
Views: 5,701
Posted By mc6809e
If you're willing to accept some repetitiveness...

If you're willing to accept some repetitiveness in the graphics you can try a tile based approach using the sprites.

Just use the copper to change only SPRxPOS to reuse a sprite.

This method...
Forum: support.WinUAE 24 December 2014, 20:27
Replies: 779
Views: 153,549
Posted By mc6809e
MOVEM.L x.L, D0-D7/A0-A7 followed by DIVS x.L, Dn

MOVEM.L x.L, D0-D7/A0-A7 followed by DIVS x.L, Dn
Forum: support.WinUAE 23 December 2014, 17:28
Replies: 779
Views: 153,549
Posted By mc6809e
Ah, this explains why MOVEM.L + DIVS has a longer...

Ah, this explains why MOVEM.L + DIVS has a longer latency than a pair of MOVEM.L or DIVS.

MOVEM.L must sample very early and DIVS very late. Together they have potential 300+ cycle latency.
Forum: News 18 December 2014, 22:31
Replies: 49
Views: 6,826
Posted By mc6809e
Sincere thanks.

Sincere thanks.
Forum: Coders. Asm / Hardware 18 December 2014, 17:36
Replies: 16
Views: 3,650
Posted By mc6809e
It would be nice to see how the blitter is...

It would be nice to see how the blitter is designed, though.

There may even been some some new tricks made possible by knowing what happens when switching modes, channel use, etc while the blitter...
Forum: Coders. Asm / Hardware 15 December 2014, 20:32
Replies: 16
Views: 3,650
Posted By mc6809e
http://eab.abime.net/showthread.php?t=63227&highli...

http://eab.abime.net/showthread.php?t=63227&highlight=paula+audio+phase
Forum: Nostalgia & memories 14 December 2014, 05:02
Replies: 189
Views: 20,675
Posted By mc6809e
Imagine what just one extra DMA channel for HD...

Imagine what just one extra DMA channel for HD transfers would have done.

Possibly the problem with fast ram at the time was PCB space/price. Fast ram requires it's own address and data bus. Maybe...
Forum: Nostalgia & memories 10 December 2014, 04:58
Replies: 189
Views: 20,675
Posted By mc6809e
I wonder if that competition for 68K series chips...

I wonder if that competition for 68K series chips limited Commodore's options.
Forum: Coders. General 07 December 2014, 20:09
Replies: 204
Views: 29,265
Posted By mc6809e
Does the MC6809e count? It had a 16-bit...

Does the MC6809e count? It had a 16-bit accumulator with 16-bit index registers and 16-bit arithmetic operations and a 8x8->16bit multiply.

A pair of articles in November 1983...
Forum: Amiga scene 04 December 2014, 18:20
Replies: 104
Views: 19,885
Posted By mc6809e
Let me just say that I appreciate any...

Let me just say that I appreciate any contribution of any size given by anyone of any sort.

Thank you, everyone.
Forum: Amiga scene 03 December 2014, 22:26
Replies: 25
Views: 2,801
Posted By mc6809e
Swap those numbers, Mr. Retro.

Swap those numbers, Mr. Retro.
Forum: Coders. Asm / Hardware 02 December 2014, 22:34
Replies: 32
Views: 4,474
Posted By mc6809e
Well, as a member of the silicon conservation...

Well, as a member of the silicon conservation society, I object to the wastefulness of 64 bit datums!

Seriously, though, there is a penalty for using bigger values. Cache is too valuable to be...
Forum: Coders. General 02 December 2014, 22:08
Replies: 3
Views: 779
Posted By mc6809e
Higher max possible frame rate? You could...

Higher max possible frame rate?

You could compromise and use something a little smaller that will be overscan when in NTSC mode.

I think the max NTSC size is around 242 or so.

The...
Forum: Coders. Asm / Hardware 02 December 2014, 20:09
Replies: 32
Views: 4,474
Posted By mc6809e
I'm a big fan of 48-bit words. I'm...

I'm a big fan of 48-bit words.

I'm surprised they haven't come back, given how often computers are used in multimedia. 48 bits is a convenient size for all sorts of things.
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