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Forum: Coders. Asm / Hardware Yesterday, 10:35
Replies: 17
Views: 748
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: 748
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: 344,021
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: 677
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: 748
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: 254
Views: 22,483
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: 61
Views: 2,132
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: 1,650
Views: 119,272
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: 254
Views: 22,483
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: 254
Views: 22,483
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: 254
Views: 22,483
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: 254
Views: 22,483
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: 254
Views: 22,483
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: 1,690
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: 973
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...
Forum: Coders. General 03 November 2019, 14:10
Replies: 274
Views: 9,291
Posted By roondar
When you talk about impact, do you mean the...

When you talk about impact, do you mean the impact in lost performance?
If that is the case, don't worry about it - a Copper move only takes up 2 DMA slots out of about 70.000 per frame. A wait is...
Forum: OT - General 02 November 2019, 13:47
Replies: 9
Views: 534
Posted By roondar
You make some excellent points there, I agree...

You make some excellent points there, I agree with all of them.

On a side-note: my life on the forum has improved immeasurably since I've started to mostly ignore the VS threads and all of the...
Forum: Retrogaming General Discussion 01 November 2019, 12:09
Replies: 50
Views: 1,765
Posted By roondar
On the ST: apparently it was designed at a record...

On the ST: apparently it was designed at a record pace - mostly using chips and technology that Atari already had in store or could be gotten off the shelves. It's quite amazing how many they managed...
Forum: Coders. General 01 November 2019, 12:05
Replies: 274
Views: 9,291
Posted By roondar
This makes me consider a trick I once heard was...

This makes me consider a trick I once heard was used in some demos (sorry, this is rather off-topic - I'll keep it short and not do ten posts about it): apparently you can use HAM mode to get 'free'...
Forum: Retrogaming General Discussion 01 November 2019, 11:46
Replies: 50
Views: 1,765
Posted By roondar
There was also The Misadventures of Flink...

There was also The Misadventures of Flink (http://hol.abime.net/577) for the CD32, which I always thought looked very nice. Apparently it's a very nice game to play as well.

Edit:

I think...
Forum: Coders. General 01 November 2019, 11:02
Replies: 274
Views: 9,291
Posted By roondar
AFAIK deimos has stopped making two versions and...

AFAIK deimos has stopped making two versions and has decided to only look into the CPU only version (with Blitter limited to clearing the screen).

Which is why I said it shouldn't matter much if...
Forum: Coders. General 01 November 2019, 10:53
Replies: 274
Views: 9,291
Posted By roondar
I don't think it'll make much of a difference for...

I don't think it'll make much of a difference for this particular game. AGA bandwidth features are mostly useful for the Blitter or when using lots of bitplanes. For anything 4 bitplanes and less,...
Forum: Coders. Asm / Hardware 01 November 2019, 10:48
Replies: 34
Views: 1,690
Posted By roondar
Gameplay can be brilliant even for 160x100...

Gameplay can be brilliant even for 160x100 monochrome graphics ;)

Anyway, what you're describing is essentially a kind of 'Hyper Hybris' (which is a game that uses only sprites for all the enemies...
Forum: Retrogaming General Discussion 01 November 2019, 10:34
Replies: 50
Views: 1,765
Posted By roondar
You must be really happy with AGA then, as OCS...

You must be really happy with AGA then, as OCS graphics already look much more like SNES graphics than Master System graphics. And AGA games look even better than OCS games :D

More seriously, I've...
Forum: Coders. General 31 October 2019, 17:56
Replies: 274
Views: 9,291
Posted By roondar
Yes, main loop will also work

Yes, main loop will also work
Forum: Coders. General 31 October 2019, 17:43
Replies: 274
Views: 9,291
Posted By roondar
Thanks for clearing it up (again), next time I...

Thanks for clearing it up (again), next time I won't trust merely my eyes ;)


That is certainly an option.

Another is to set the COP1LC values using the copper as the last thing before the...
Forum: Retrogaming General Discussion 31 October 2019, 16:08
Replies: 50
Views: 1,765
Posted By roondar
I agree with all of these. And I'll add: both OCS...

I agree with all of these. And I'll add: both OCS and AGA were IMHO 'hurt' by the prevalence of ports from other systems.

In the case of OCS there were so many games ported from lesser systems...
Forum: Retrogaming General Discussion 31 October 2019, 16:03
Replies: 42
Views: 2,152
Posted By roondar
I'm going to say something quite silly here. True...

I'm going to say something quite silly here. True for me, but still silly. The following then is opinion, not fact ;)

I do not like CIV 2.

There. I've said it. I think CIV 1 is a much better,...
Forum: Coders. General 31 October 2019, 15:10
Replies: 274
Views: 9,291
Posted By roondar
That doesn't seem right to me. I've looked at...

That doesn't seem right to me. I've looked at Elite 2: Frontier in the past using the WinUAE visual DMA debugger and it seems to interleave it's Blitter clear 'perfectly' with the display and not...
Forum: Coders. General 31 October 2019, 14:55
Replies: 274
Views: 9,291
Posted By roondar
Perhaps that was worded too strongly. Of course...

Perhaps that was worded too strongly. Of course the CPU can use any idle cycles.

What I was trying to get across is that if you're interleaving a Blitter clear with bitplane DMA, then the Blitter...
Forum: Coders. General 31 October 2019, 14:20
Replies: 274
Views: 9,291
Posted By roondar
Regardless of which version you end up choosing,...

Regardless of which version you end up choosing, using the Blitter to clear the screen (when done in an optimal way as previously discussed) is always preferable to just using the CPU.

That said,...
Forum: Coders. General 31 October 2019, 14:13
Replies: 274
Views: 9,291
Posted By roondar
Good to know :) Do note what chb correctly...

Good to know :)

Do note what chb correctly pointed out. This method is only really useful if you do other stuff with the Blitter when there's no bitplane DMA.

That would work, yes

If I...
Forum: Coders. General 31 October 2019, 12:58
Replies: 274
Views: 9,291
Posted By roondar
As I understand it, you're clearing the screen...

As I understand it, you're clearing the screen with the Blitter, correct?

In that case, there's a couple of optimisations you can do because of how Blitter clear works. (mutually exclusive, so...
Forum: Coders. General 28 October 2019, 12:54
Replies: 274
Views: 9,291
Posted By roondar
If you check the values of the registers as given...

If you check the values of the registers as given by the debugger in the block above the code, you'll see that at the time of the break A2 has a value of 0026265E, which just so happens to be 4...
Forum: Coders. General 28 October 2019, 12:31
Replies: 274
Views: 9,291
Posted By roondar
In all fairness, I've never understood what the...

In all fairness, I've never understood what the 'num' parameter in the w command actually does. I know that using 0 makes it do what I want, but I don't know why. And being a programmer, this bugs me...
Forum: Coders. Asm / Hardware 28 October 2019, 12:24
Replies: 34
Views: 1,690
Posted By roondar
Yup, they are. It's (IMHO) one of the many ways...

Yup, they are. It's (IMHO) one of the many ways in which you can see that the Amiga OCS chipset was clearly optimised for using 16 colour/4 bitplane screen modes.

16 colour sprites are also a good...
Forum: Coders. General 24 October 2019, 23:10
Replies: 274
Views: 9,291
Posted By roondar
Ah yes, the hardware bug. I forgot about that....

Ah yes, the hardware bug. I forgot about that. Ross is 100% correct here, never use the CPU to strobe COPJMP while the Blitter is running. This can cause all sorts of mayhem.
Forum: Coders. General 24 October 2019, 22:48
Replies: 274
Views: 9,291
Posted By roondar
Ok, if I understood your copper list, it's...

Ok, if I understood your copper list, it's luckily not that difficult to explain.

At the start of each frame, the Copper will always start running the list pointed to by COPLC1. So, COPLC1 must...
Forum: Coders. General 23 October 2019, 15:55
Replies: 274
Views: 9,291
Posted By roondar
Ahh, I'm sorry. I didn't understand that was the...

Ahh, I'm sorry. I didn't understand that was the way it worked.
Well, I do think there's a WinUAE command line option to start the debugger. But I don't know what it is :banghead
Forum: Coders. General 23 October 2019, 15:49
Replies: 274
Views: 9,291
Posted By roondar
The UAE debugger is part of WinUAE, it does not...

The UAE debugger is part of WinUAE, it does not depend on which compiler you use ;)
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