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Search: Posts Made By: Megol
Forum: Coders. Asm / Hardware 29 January 2018, 21:45
Replies: 23
Views: 1,325
Posted By Megol
LE is the mirroring of BE (and vice versa of...

LE is the mirroring of BE (and vice versa of course) - in your example 87654321.

But whatever. The real world doesn't care.
Forum: Coders. Asm / Hardware 29 January 2018, 17:39
Replies: 23
Views: 1,325
Posted By Megol
If you accept that the format isn't scrambled...

If you accept that the format isn't scrambled then you don't have to.

The L->R order for writing isn't more valid than the R->L order. Plenty of writing systems combine the two without being...
Forum: Coders. Asm / Hardware 28 January 2018, 16:14
Replies: 23
Views: 1,325
Posted By Megol
As I already said I have no problem reading hex...

As I already said I have no problem reading hex dumps using the LE format.
Really if that is a problem for someone they shouldn't be reading hex dumps at all.

BTW you swapped BE <-> LE in your...
Forum: Coders. Asm / Hardware 28 January 2018, 15:54
Replies: 23
Views: 1,325
Posted By Megol
Most influential computer family: IBM system...

Most influential computer family:
IBM system 360 that lives on as the Z family of computers. 1965 to 2018 and still going strong. Big endian.
Forum: Coders. Asm / Hardware 27 January 2018, 23:28
Replies: 23
Views: 1,325
Posted By Megol
It helps with some math but doesn't really matter...

It helps with some math but doesn't really matter anymore. But the same applies to big endian - just doesn't matter.



byte: LL
word: LL LH
dword (long): LL LH HL HH

Is read in the order:...
Forum: Coders. Asm / Hardware 27 January 2018, 22:55
Replies: 23
Views: 1,325
Posted By Megol
Why would it be superior? Some things are better...

Why would it be superior? Some things are better and some things are worse.

Doesn't matter in practice. Unless one is lazy and don't want to learn simple things.



Signed zero, less value...
Forum: Coders. Asm / Hardware 17 January 2018, 14:15
Replies: 17
Views: 693
Posted By Megol
Thanks for the explanation! While I have used the...

Thanks for the explanation! While I have used the "trick" in the past I've never actually looked at how it works.
Forum: Coders. Asm / Hardware 17 January 2018, 01:01
Replies: 17
Views: 693
Posted By Megol
Well floats are just scaled integers with a funky...

Well floats are just scaled integers with a funky encoding.
But a lookup table should be faster in this case I think?
Forum: Coders. Asm / Hardware 13 January 2018, 12:16
Replies: 81
Views: 6,647
Posted By Megol
So you are rendering all the pixels anyway but...

So you are rendering all the pixels anyway but adding a comparison requiring a memory read plus a branch.

If the texturing code was very fast but the c2p code was _extremely_ slow that could be a...
Forum: support.WinUAE 09 January 2018, 17:53
Replies: 19
Views: 905
Posted By Megol
The majority of I/O is memory mapped. The I/O...

The majority of I/O is memory mapped. The I/O instructions are legacy only and _extremely_ slow.

I could do some hw hacking faster with a Pentium than with my current system. So a 90MHz in-order...
Forum: Retrogaming General Discussion 05 January 2018, 15:53
Replies: 184
Views: 13,899
Posted By Megol
The difference is that with a limited palette and...

The difference is that with a limited palette and limited types of gradients it would be possible to store pre-scaled slices reducing the inner loop to a simple copy.

That could make a huge...
Forum: Retrogaming General Discussion 03 January 2018, 21:58
Replies: 184
Views: 13,899
Posted By Megol
It should be possible to store pre-scaled slices...

It should be possible to store pre-scaled slices and use the blitter to draw them.

But the floors and ceiling would most likely need to be one color.
Forum: Retrogaming General Discussion 21 December 2017, 17:28
Replies: 184
Views: 13,899
Posted By Megol
If someone really want this to happen why not...

If someone really want this to happen why not contact ray* who did the ST/STe port and ask if he'd be interested in doing an Amiga port or helping in making one?

A raw conversion should be...
Forum: Retrogaming General Discussion 19 December 2017, 16:39
Replies: 184
Views: 13,899
Posted By Megol
Shouldn't mipmaps work and help a bit? 64x64...

Shouldn't mipmaps work and help a bit?
64x64 4bpl texture = 2048 bytes
51 textures x 2048 = 104448 bytes

51 textures x 2048 bytes each with mipmaps from 64x64, 32x32, .., 1x1...
Forum: Retrogaming General Discussion 18 December 2017, 14:41
Replies: 184
Views: 13,899
Posted By Megol
Character based rendering can produce something...

Character based rendering can produce something usable (but not nice looking), the ZX Spectrum have some wall rendering demos that shows that the basic idea work:
"Doom"...
Forum: Retrogaming General Discussion 18 December 2017, 13:08
Replies: 184
Views: 13,899
Posted By Megol
This is exactly how anyone that can code would...

This is exactly how anyone that can code would write it on a system without hardware scaling and chunky pixels.

In fact this is how Wolfenstein 3D did it. Wall only mapping -> the easiest kind of...
Forum: Retrogaming General Discussion 14 December 2017, 17:58
Replies: 184
Views: 13,899
Posted By Megol
Doesn't say much without specifying what kind of...

Doesn't say much without specifying what kind of instructions etc. The 8088 have a 8 bit memory bus which makes a difference even with the same theoretical instruction throughput and the 68k can do...
Forum: Retrogaming General Discussion 11 December 2017, 14:14
Replies: 184
Views: 13,899
Posted By Megol
BSP is probably better than raycasting. IIRC the...

BSP is probably better than raycasting. IIRC the Atari ST version uses BSP.

These threads pop up from time to time - you even linked one of them. Why would this be different than all other...
Forum: Retrogaming General Discussion 01 December 2017, 12:56
Replies: 42
Views: 1,476
Posted By Megol
I want to apologize for the unnecessary insults...

I want to apologize for the unnecessary insults posted earlier.
One shouldn't reply in kind even when someone throws one of the worst insults possible in ones face.
Forum: Retrogaming General Discussion 30 November 2017, 20:23
Replies: 42
Views: 1,476
Posted By Megol
How you can get to that conclusion from what I...

How you can get to that conclusion from what I posted is a mystery to me.

I will say^H^H^Hwrite this as simple as possible:

If someone (still with me?) don't like something (following?) then...
Forum: Retrogaming General Discussion 30 November 2017, 15:26
Replies: 42
Views: 1,476
Posted By Megol
It's about common courtesy. Yeah.

It's about common courtesy.



Yeah.
Forum: Retrogaming General Discussion 29 November 2017, 20:47
Replies: 42
Views: 1,476
Posted By Megol
Maybe you shouldn't be posting in a thread...

Maybe you shouldn't be posting in a thread dedicated to a computer with that sound chip then? Or at least not complain about the sound chip repeatedly...
Forum: News 28 November 2017, 23:30
Replies: 69
Views: 5,594
Posted By Megol
https://en.wikipedia.org/wiki/Alpha_hydroxy_acid ...

https://en.wikipedia.org/wiki/Alpha_hydroxy_acid

;)
Forum: Retrogaming General Discussion 28 November 2017, 15:38
Replies: 42
Views: 1,476
Posted By Megol
DMA feeding the soundchip Akira thinks sound like...

DMA feeding the soundchip Akira thinks sound like "... like grinding metal against a blackboard".

How it that relevant?
Forum: Nostalgia & memories 21 November 2017, 18:29
Replies: 147
Views: 12,315
Posted By Megol
IIRC it would only have required a DIN connector....

IIRC it would only have required a DIN connector. But it wouldn't be used by most people and at least some software included a MIDI dongle.
Don't think it would make any difference.

What? Don't...
Forum: Coders. General 21 November 2017, 17:49
Replies: 40
Views: 3,826
Posted By Megol
I wonder why you think 8 bits in a chunky mode...

I wonder why you think 8 bits in a chunky mode requires the bandwidth of 16 planar bits. Bits are bits.

320x256 with 4 bpl would provide enough bandwidth for 160x256 in 8 bit chunky.
640x256 with...
Forum: Coders. General 14 November 2017, 18:56
Replies: 181
Views: 12,445
Posted By Megol
Have anyone ever tried to decompress graphics...

Have anyone ever tried to decompress graphics data with the blitter?

Doubt that it would be worth the effort but had to ask.
Forum: Coders. General 14 November 2017, 14:48
Replies: 181
Views: 12,445
Posted By Megol
It's easier doing hardware targeting hacks in a...

It's easier doing hardware targeting hacks in a demo than in a game. Remember that the CPC had 4(?) different CRTC chips which require different code to do scrolling etc. IIRC some effects couldn't...
Forum: Coders. General 13 November 2017, 14:31
Replies: 181
Views: 12,445
Posted By Megol
IMHO the really cool thing about Metal Slug is...

IMHO the really cool thing about Metal Slug is the animations.
Big sprites? Yeah, guess that's kinda cool in combination with animation.
Lots of sprites? Soon becomes messy. But then I'm not a...
Forum: News 13 November 2017, 13:28
Replies: 204
Views: 27,090
Posted By Megol
Thanks! Apparently I already downloaded that file...

Thanks! Apparently I already downloaded that file but don't remember looking at it (or even downloading). :nuts

F-line and clean. Like it.
Forum: Coders. General 12 November 2017, 23:44
Replies: 181
Views: 12,445
Posted By Megol
But isn't the PS1 using 256 colors?

But isn't the PS1 using 256 colors?
Forum: Retrogaming General Discussion 12 November 2017, 21:30
Replies: 20
Views: 2,191
Posted By Megol
Impressive!

Impressive!
Forum: Coders. General 12 November 2017, 20:10
Replies: 181
Views: 12,445
Posted By Megol
But the thing is doing smaller games would...

But the thing is doing smaller games would actually be training and writing code for bigger projects!
Making n smaller projects where each solves m problems with the big ones means the big projects...
Forum: project.SPS (was CAPS) 12 November 2017, 15:50
Replies: 584
Views: 164,922
Posted By Megol
Thanks!

Thanks!
Forum: News 12 November 2017, 15:47
Replies: 204
Views: 27,090
Posted By Megol
So how are the instructions encoded?

So how are the instructions encoded?
Forum: Coders. General 10 November 2017, 15:38
Replies: 181
Views: 12,445
Posted By Megol
You really are crazy and not in a positive way if...

You really are crazy and not in a positive way if you think converting the graphics to a lower color space is 1/2 the work. It's not 1/100 or ever 1/1000 of the work required.

Metal slug was...
Forum: News 10 November 2017, 13:15
Replies: 33
Views: 3,431
Posted By Megol
I think this is a good announcement even if not...

I think this is a good announcement even if not great. There are problems finding '60 CPUs and those that can be found are commonly salvage from old hardware and of unknown reliability. Remarking of...
Forum: News 09 November 2017, 18:33
Replies: 33
Views: 3,431
Posted By Megol
EA = base +index*scale +offset32 = base+...

EA = base +index*scale +offset32 = base+ (index<<n) +offset32

3 input addition with a (small) shift isn't complex? Do you mean that it can be described in several ways or that the base can be...
Forum: News 09 November 2017, 15:57
Replies: 33
Views: 3,431
Posted By Megol
For what? Now it was a while since I last looked...

For what? Now it was a while since I last looked at decoding 68k instructions but what I really wanted was an equivalent to a 16 input PAL for detecting misc. stuff.
Forum: News 09 November 2017, 15:55
Replies: 33
Views: 3,431
Posted By Megol
Doing an advanced processor is hard work, sure....

Doing an advanced processor is hard work, sure. But it isn't rocket science - at least not on the level of advanced we are talking about here. There are several projects where individuals and small...
Showing results 1 to 40 of 271

 
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