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Forum: Retrogaming General Discussion Yesterday, 14:49
Replies: 3
Views: 188
Posted By roondar
Actually, all the Amiga custom chips (Paula,...

Actually, all the Amiga custom chips (Paula, Denise, Agnus) do DMA.

But what I was talking about was the Copper controlling the chipset, which is rather different. After all, no matter how tiny,...
Forum: Retrogaming General Discussion Yesterday, 13:43
Replies: 3
Views: 188
Posted By roondar
On the Amiga, the Copper can execute a Copper...

On the Amiga, the Copper can execute a Copper list. Copper lists can blit (do graphic jobs), play samples, set up the screen, display/move sprites, etc. It is even possible to write a Copper list so...
Forum: Coders. C/C++ 10 December 2019, 16:53
Replies: 10
Views: 434
Posted By roondar
I may be misinterpreting your code. But if I...

I may be misinterpreting your code. But if I understand it correctly, the problem might be found in the code below.

/* stuff removed */
if (frame==0) {
view.LOFCprList =...
Forum: Coders. C/C++ 09 December 2019, 22:54
Replies: 67
Views: 5,345
Posted By roondar
I've recently found this rather useful extension....

I've recently found this rather useful extension. It works well, but I have run into a small problem.

Debugging only seems to work once.

That is, I can debug to my hearts content, until I stop...
Forum: Nostalgia & memories 07 December 2019, 22:05
Replies: 18
Views: 523
Posted By roondar
Ooh, that's a very subjective question. If you're...

Ooh, that's a very subjective question. If you're looking for the best Amiga original game (whether ported later or not), I'd hazard a guess that both Lemmings and Worms might actually score really...
Forum: Retrogaming General Discussion 07 December 2019, 21:53
Replies: 90
Views: 4,092
Posted By roondar
No, it is not. Monitors that emit high levels of...

No, it is not. Monitors that emit high levels of radiation were not allowed to be sold.

What you're feeling with your hand is simply static electricity caused by the charge of the glass, not...
Forum: Retrogaming General Discussion 07 December 2019, 13:23
Replies: 90
Views: 4,092
Posted By roondar
I probably shouldn't bother, but just in case... ...

I probably shouldn't bother, but just in case...

CRT's from the 1980's are not "terribly radioactive". The 1084S is not an exception here. It is not radioactive.
Forum: Retrogaming General Discussion 04 December 2019, 19:11
Replies: 90
Views: 4,092
Posted By roondar
Perhaps I expressed that too strongly. I mean to...

Perhaps I expressed that too strongly. I mean to say that while it's an improvement, it's still blurring more than my CRT does. Still visible to me anyway. Personally, I also feel the difference in...
Forum: Coders. Asm / Hardware 04 December 2019, 18:50
Replies: 12
Views: 698
Posted By roondar
COP1LC should be set before the Copper list...

COP1LC should be set before the Copper list starts to execute, which is directly after VBLANK. However, if you set it late the change will just take effect one frame later. Unless you're continuously...
Forum: Retrogaming General Discussion 04 December 2019, 18:45
Replies: 90
Views: 4,092
Posted By roondar
I happen to have monitor that can do this. Also...

I happen to have monitor that can do this. Also seen it used by others. Now, I love my monitor - modern screens are great for all but retro games. That said...

IMHO black frame insertion does not...
Forum: support.WinUAE 04 December 2019, 01:02
Replies: 18
Views: 570
Posted By roondar
I think disabling aspect ratio correction might...

I think disabling aspect ratio correction might be the 'trick'. Whenever that's on I notice some lines being thicker than others (and that seems to extends to the scanlines as well).

My guess it's...
Forum: Retrogaming General Discussion 04 December 2019, 00:57
Replies: 90
Views: 4,092
Posted By roondar
I read that as meaning motion blur, which is an...

I read that as meaning motion blur, which is an inherent flaw of LCD/LED technology. It's the main reason that I still find scrolling nicer on my old CRT.
Forum: Retrogaming General Discussion 30 November 2019, 23:31
Replies: 21
Views: 1,000
Posted By roondar
I've always like the C64's music best of the home...

I've always like the C64's music best of the home versions. The Amiga's music is pretty good too, though it feels too fast to me and I don't like the drums much. Megadrive version has good music but...
Forum: Coders. General 30 November 2019, 23:12
Replies: 106
Views: 2,768
Posted By roondar
I don't know the cause for this discrepancy, but...

I don't know the cause for this discrepancy, but I am certain it has nothing to do with the difference between external and internal timing itself. Some of my own programs have had performance...
Forum: Nostalgia & memories 30 November 2019, 16:50
Replies: 44
Views: 1,237
Posted By roondar
Last boxed game I bought back in the day was...

Last boxed game I bought back in the day was Alien Breed 3D II.
Last boxed game I bought recently was RGCD's Tiger Claw.
Forum: Coders. General 30 November 2019, 16:45
Replies: 106
Views: 2,768
Posted By roondar
Please understand I'm not trying to make a big...

Please understand I'm not trying to make a big deal out of this. But I respectfully disagree here. In my view your figures show a pretty big margin of error for measuring using amtime:
That's a...
Forum: Coders. General 28 November 2019, 11:53
Replies: 106
Views: 2,768
Posted By roondar
About the time measuring... Measuring the total...

About the time measuring... Measuring the total execution time of the program rather than just the part of the code that you've changed will obviously report a lower percentage improvement than...
Forum: Coders. Asm / Hardware 15 November 2019, 17:45
Replies: 4
Views: 273
Posted By roondar
The numbers you mention seem wrong, a move from...

The numbers you mention seem wrong, a move from d(an,ix) is never as low as 10 cycles. For reference, I use this site for my CPU timing info:...
Forum: Coders. Asm / Hardware 15 November 2019, 17:30
Replies: 11
Views: 517
Posted By roondar
Thanks for the info, I'll make the required...

Thanks for the info, I'll make the required changes to do this :great

One follow-up question: do either of you know where this is documented (I assume it's in the HRM and I just missed it), as I'd...
Forum: Retrogaming General Discussion 15 November 2019, 17:00
Replies: 214
Views: 18,237
Posted By roondar
That's interesting news... Would be awesome if...

That's interesting news... Would be awesome if that source were to be allowed to be spread around.
Forum: Amiga scene 15 November 2019, 16:59
Replies: 35
Views: 2,858
Posted By roondar
I'd love to have a 68060 accelerator for my...

I'd love to have a 68060 accelerator for my A1200, but it really, really, really needs a software/firmware way to temporarily turn it off (ideally by simply holding a button on boot like the Blizzard...
Forum: request.Other 15 November 2019, 16:56
Replies: 9
Views: 901
Posted By roondar
This is a much to serious reply to this thread,...

This is a much to serious reply to this thread, but here goes:

I'm pretty sure there's no such thing as military spec Amiga's. But if they truly exist (as in not that silly stuff linked to above),...
Forum: Coders. Asm / Hardware 15 November 2019, 16:54
Replies: 11
Views: 517
Posted By roondar
Question Correctly setting up an interlace screen

I have a small question: how do you correctly set up an interlaced screen in a HW banging no OS present situation?

That is, I know which bits to set in BPLCON0 and I do get an interlaced screen,...
Forum: Coders. General 14 November 2019, 16:27
Replies: 51
Views: 3,960
Posted By roondar
Just a thought... You could perhaps opt for...

Just a thought... You could perhaps opt for having each enemy consist of two bobs: one main and one propeller. That way you'd only need to store a few different propellers for all enemies combined.
...
Forum: project.EAB 14 November 2019, 16:24
Replies: 15
Views: 688
Posted By roondar
Hmm, warnings etc for consistently going...

Hmm, warnings etc for consistently going off-topic. I'll consider myself warned ahead of time :D

(my self deprecation aside, this is actually a good rule :great)
Forum: Coders. Asm / Hardware 11 November 2019, 10:35
Replies: 17
Views: 996
Posted By roondar
Apart from the method Ross used, there is a...

Apart from the method Ross used, there is a 'cheat' of sorts here as well. I use the following:


Draw the top and/or bottom status panel using colour 1 as background instead of colour 0
Draw...
Forum: Coders. Asm / Hardware 07 November 2019, 23:07
Replies: 17
Views: 996
Posted By roondar
I can certainly give it a try :) Let's start...

I can certainly give it a try :)

Let's start with the easy ones: diwstart, diwstrop, ddfstrt & ddfstop
These will be the same as usual (as in, the same as for a 320x256 display). To see why,...
Forum: Coders. General 07 November 2019, 22:39
Replies: 2,263
Views: 348,022
Posted By roondar
The A500 is a bit confusing in that several...

The A500 is a bit confusing in that several revision of it existed and some of those revisions had the ECS Agnus in it. Mine was one of those, after cutting a trace of the board I got 1MB chip...
Forum: support.Hardware 07 November 2019, 16:41
Replies: 13
Views: 756
Posted By roondar
I suppose you could do something janky with that...

I suppose you could do something janky with that little hole next to the mouse ports. Though it might not be big enough for CF cards and some expansions already use it (my Indivision AGA came with a...
Forum: Coders. Asm / Hardware 07 November 2019, 16:22
Replies: 17
Views: 996
Posted By roondar
I want to point out something. While DanScott &...

I want to point out something. While DanScott & meynaf are 100% correct and I agree that having a Blitter routine that clips properly is a very good thing to have and code, there is an alternative...
Forum: Amiga scene 07 November 2019, 16:16
Replies: 269
Views: 27,385
Posted By roondar
I can confirm the Blitter does not get the extra...

I can confirm the Blitter does not get the extra cycle for this type of blit. Even better for this scenario, neither does bitplane DMA - the idle cycle can be freely used by the CPU.

Recently...
Forum: Retrogaming General Discussion 06 November 2019, 11:21
Replies: 90
Views: 4,092
Posted By roondar
I absolutely love the look of Amiga graphics over...

I absolutely love the look of Amiga graphics over a period accurate CRT monitor like the CM8833 or 1084S, scanlines included. It's also crystal clear to me that the graphics were designed with the...
Forum: Coders. Contest 06 November 2019, 01:22
Replies: 1,679
Views: 125,277
Posted By roondar
I can't fix the score bombing by those muppets......

I can't fix the score bombing by those muppets...
But I have added my vote. And guess what.. It ain't no 1.
Forum: Amiga scene 06 November 2019, 00:40
Replies: 269
Views: 27,385
Posted By roondar
I can respect not liking 2x2 rendering, but it...

I can respect not liking 2x2 rendering, but it considering what's being attempted here I don't see any other option. Remember, even Doom did 2x2 rendering for the main part of the screen in...
Forum: Amiga scene 06 November 2019, 00:32
Replies: 269
Views: 27,385
Posted By roondar
Look, I genuinely like your out-of-the-box...

Look, I genuinely like your out-of-the-box thinking. But this just doesn't seem like a very realistic solution.

I'm not saying it definitely can't be done, but you're essentially suggesting...
Forum: Amiga scene 06 November 2019, 00:22
Replies: 269
Views: 27,385
Posted By roondar
The point is that even at 160x100 the theoretical...

The point is that even at 160x100 the theoretical maximum frame rate when you're not doing anything except drawing with the Blitter is not far from the one the current CPU drawing routines get (16fps...
Forum: Amiga scene 06 November 2019, 00:16
Replies: 269
Views: 27,385
Posted By roondar
That is 1 million pixels per second@1 bitplane,...

That is 1 million pixels per second@1 bitplane, so you must divide that by the number of bitplanes to get an accurate figure. Meaning for a 4 bitplane screen it's 250.000 pixels per second, not 1...
Forum: Amiga scene 05 November 2019, 23:54
Replies: 269
Views: 27,385
Posted By roondar
Isn't that too slow to be useful? Remember, the...

Isn't that too slow to be useful? Remember, the Blitter only draws a single pixel@1 bitplane in 8 CPU cycles when in line mode.
Forum: Coders. Asm / Hardware 04 November 2019, 18:23
Replies: 34
Views: 2,113
Posted By roondar
Amiga sprites work very well in vertical...

Amiga sprites work very well in vertical shooters: you can often make the player and/or all of the player bullets into sprites, or alternatively make all enemy bullets sprites. Both work fit the...
Forum: Coders. Asm / Hardware 04 November 2019, 18:20
Replies: 29
Views: 1,384
Posted By roondar
I can confirm that on my Blizzard 1230MK IV data...

I can confirm that on my Blizzard 1230MK IV data burst is normally off. I've tried to manually activate it and found no performance benefit whatsoever, so maybe it's off for the reason grond...
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