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Forum: Coders. C/C++ 07 April 2020, 22:41
Replies: 11
Views: 1,344
Posted By robinsonb5
Ah yes, I missed that __interrupt causes the...

Ah yes, I missed that __interrupt causes the function to end with rte.


A quick test suggests __amigainterrupt doesn't seem to save the scratch registers either.





It would help a lot...
Forum: Coders. C/C++ 07 April 2020, 00:14
Replies: 11
Views: 1,344
Posted By robinsonb5
Possible, yes - but very ugly. The only way I...

Possible, yes - but very ugly.
The only way I can think of (without modifying vbcc) would be to use an inline assembly function to save the registers. It would look something like this:


int...
Forum: Amiga scene 06 April 2020, 23:27
Replies: 41
Views: 5,407
Posted By robinsonb5
There's quite a lot of of misunderstanding about...

There's quite a lot of of misunderstanding about that. From the government's website:
"The government is not saying only people doing "essential" work can go to work. Anyone who cannot work from...
Forum: support.Hardware 05 April 2020, 15:23
Replies: 20
Views: 801
Posted By robinsonb5
I had no trouble accessing it here - so I've...

I had no trouble accessing it here - so I've uploaded it to The Zone for you.
http://eab.abime.net/zone.php?
(If you've not used it before:...
Forum: Retrogaming General Discussion 01 April 2020, 21:30
Replies: 14
Views: 462
Posted By robinsonb5
I think I've still got mine somewhere - minus the...

I think I've still got mine somewhere - minus the pad of course. Must have a go at printing a replacement sometime!


But yeah, it was a really nice mouse.
Forum: Coders. Asm / Hardware 01 April 2020, 17:37
Replies: 47
Views: 2,351
Posted By robinsonb5
I got the same numbers with an implementation in...

I got the same numbers with an implementation in C, so I think it's correct.
Forum: Retrogaming General Discussion 01 April 2020, 10:24
Replies: 34
Views: 1,012
Posted By robinsonb5
If you're going to take power-ups away then there...

If you're going to take power-ups away then there needs to be a *very* good justification for it, story-wise, otherwise it does feel like you're being cheated.

On the other hand, there's nothign...
Forum: Coders. Asm / Hardware 01 April 2020, 09:48
Replies: 47
Views: 2,351
Posted By robinsonb5
Am I missing something, or are "001" and "101" ...

Am I missing something, or are "001" and "101" not equivalent as a prequel? The four cases that matter, unless I'm misunderstanding, are "...1", "..10", ".100" and "1000", yes? So "001" and "101"...
Forum: Coders. Asm / Hardware 01 April 2020, 09:35
Replies: 47
Views: 2,351
Posted By robinsonb5
Yes, that's similar to what I had in mind. ...

Yes, that's similar to what I had in mind.



Is there anything to to be gained from using the lower three bits as a selector?
000, 001, 010 and 100 all have different sets of valid codes that...
Forum: Coders. Asm / Hardware 31 March 2020, 22:56
Replies: 47
Views: 2,351
Posted By robinsonb5
How about having two or maybe even 4 different...

How about having two or maybe even 4 different encodings for each possible byte value, grouped on where the first 1 falls? After encoding each byte you select an encoding for the next byte depending...
Forum: Retrogaming General Discussion 30 March 2020, 17:19
Replies: 14
Views: 462
Posted By robinsonb5
Oh yes, plenty - I had the Golden Image optical...

Oh yes, plenty - I had the Golden Image optical mouse and the Wizard 560dpi mouse - both had 3 buttons.

Most PC mouse adapters will support three buttons, too.
Forum: Nostalgia & memories 30 March 2020, 15:55
Replies: 2,505
Views: 380,493
Posted By robinsonb5
Here's one that's puzzled me: Pretty much from...

Here's one that's puzzled me:
Pretty much from the Start the Amiga's user-interface library has had a facility where double-clicking the right mouse button can be used to bring up a requester.

I...
Forum: Retrogaming General Discussion 30 March 2020, 15:49
Replies: 14
Views: 462
Posted By robinsonb5
The util/mouse directory of Aminet contains a...

The util/mouse directory of Aminet contains a number of programs that can map Workbench functions to the middle mouse button, if present.

I can't think of any games that use it natively - I'd be...
Forum: Coders. General 26 March 2020, 13:24
Replies: 19
Views: 1,133
Posted By robinsonb5
I did try it once with a chequerboard floor...

I did try it once with a chequerboard floor fading to a fog colour - I used 6-bit colour resolution, mapping bits 5:2 to the Amiga's standard 3:0 bits, then mapping bit 1 to a pixel-based dither and...
Forum: Coders. General 25 March 2020, 12:55
Replies: 19
Views: 1,133
Posted By robinsonb5
Yes indeed, however with HAM the error of 0.5 you...

Yes indeed, however with HAM the error of 0.5 you get from wanting 5.5 is probably smaller than the error you get from not being able to adjust green and blue at the same time. So a more interesting...
Forum: request.Demos 24 March 2020, 22:47
Replies: 30
Views: 7,759
Posted By robinsonb5
Yeah the whole thing's very stylish. I love the...

Yeah the whole thing's very stylish. I love the underwater Easter Island section.
Forum: request.Demos 24 March 2020, 22:26
Replies: 30
Views: 7,759
Posted By robinsonb5
One of my favourites - Captured Dreams by The...

One of my favourites - Captured Dreams by The Black Lotus:
http://www.pouet.net/prod.php?which=22
Forum: Coders. General 24 March 2020, 19:47
Replies: 19
Views: 1,133
Posted By robinsonb5
It's an interesting puzzle, isn't it? Where it...

It's an interesting puzzle, isn't it?
Where it might actually be useful, is in reducing HAM fringing, since by overshooting each correction it would potentially be possible to correct two channels...
Forum: Coders. General 22 March 2020, 10:13
Replies: 19
Views: 1,133
Posted By robinsonb5
It's certainly possible - I've done this myself,...

It's certainly possible - I've done this myself, alternating two copperlists to make a gradient smoother.


It can be done with images too, but it gets more resource intensive then, since you need...
Forum: Retrogaming General Discussion 21 March 2020, 15:04
Replies: 57
Views: 3,038
Posted By robinsonb5
I'm thinking that an 030 could do a beat-em-up of...

I'm thinking that an 030 could do a beat-em-up of sorts using characters like this:
https://youtu.be/QmtfyWfomHA?t=270
(4 minutes 30 in)

Would it be Virtua Fighter? Hell, no. Would it be fun? ...
Forum: support.Other 20 March 2020, 21:12
Replies: 18
Views: 1,070
Posted By robinsonb5
Doesn't Cannon Fodder store scores / savegames in...

Doesn't Cannon Fodder store scores / savegames in an extra track? Or am I dreaming that? (I seem to remember it being a problem for the Minimig.)


As for Diskspare, most of its extra capacity...
Forum: support.Hardware 20 March 2020, 10:25
Replies: 16
Views: 489
Posted By robinsonb5
That's great news - well done! The...

That's great news - well done!



The chip in question is a quad op-amp so swapping that out changes all four opamps in the audio filter circuitry - are there any more elsewhere?
Forum: support.Hardware 20 March 2020, 00:13
Replies: 16
Views: 489
Posted By robinsonb5
OK I think I'm getting a handle on how the filter...

OK I think I'm getting a handle on how the filter bypass works now.


If both channels behave identically, then I'd be looking at the switching circuit in particular. Check Q301 and surrounding...
Forum: support.Hardware 19 March 2020, 21:24
Replies: 16
Views: 489
Posted By robinsonb5
The filters are on when the power led is bright,...

The filters are on when the power led is bright, and off when dimmed.
Since the audio filter circuitry is immediately to the right of the battery on the A500+ motherboard it seems likely that you're...
Forum: Retrogaming General Discussion 18 March 2020, 17:08
Replies: 78
Views: 3,862
Posted By robinsonb5
Just so long as they don't try to publish such a...

Just so long as they don't try to publish such a thing in the i-store!
(https://www.theregister.co.uk/2020/03/16/apple_bans_covid19_games/)

If I'm confined to barracks and too fuzzy-headed to do...
Forum: Amiga scene 18 March 2020, 15:17
Replies: 9
Views: 650
Posted By robinsonb5
Anything like that can only leave the Amiga scene...

Anything like that can only leave the Amiga scene richer.


Speaking for myself - and this might be just me - but while I like video as a format for learning about new concepts, I don't like video...
Forum: Amiga scene 18 March 2020, 14:19
Replies: 9
Views: 650
Posted By robinsonb5
I'd say just make whatever you're going to get...

I'd say just make whatever you're going to get the most satisfaction from making.
(I've just watched the audio mixing video and found it really interesting.)
Forum: Hardware mods 16 March 2020, 22:09
Replies: 238
Views: 23,636
Posted By robinsonb5
Have you considered the possibility of an...

Have you considered the possibility of an autoconfig ROM-based driver - like how SCSI cards used to do it back in the day? Then you could leave the onboard Gayle fully functional when it comes to...
Forum: Hardware mods 14 March 2020, 22:57
Replies: 238
Views: 23,636
Posted By robinsonb5
The way AIBB presents its benchmark scores is a...

The way AIBB presents its benchmark scores is a bit confusing: the 25 in "A3000-25" refers to the speed, 25MHz, but the the "-40" in "A4000-40" refers to the CPU '040, which is still 25Mhz! Also,...
Forum: Coders. General 11 March 2020, 14:11
Replies: 17
Views: 676
Posted By robinsonb5
4K / 64K demos exist in the Windows world too...

4K / 64K demos exist in the Windows world too...
Forum: Coders. General 11 March 2020, 13:24
Replies: 17
Views: 676
Posted By robinsonb5
This thread should be some help - but...

This thread should be some help - but unfortunately, there's no simple solution - the problem appears to be have been floating-point rounding errors in the BASIC implementation used when generating...
Forum: Coders. General 10 March 2020, 11:09
Replies: 129
Views: 6,848
Posted By robinsonb5
Yes, absolutely! The result could be kind of...

Yes, absolutely! The result could be kind of cool though.
Now I'm wondering about drawing vector-based stick-man fighters in realtime!
Forum: Retrogaming General Discussion 10 March 2020, 09:31
Replies: 15
Views: 2,118
Posted By robinsonb5
They're not great, to be honest. They work...

They're not great, to be honest. They work reasonably well, but they're not particularly comfortable compared with either the SNES or Sega pads.
Forum: Coders. General 09 March 2020, 11:00
Replies: 129
Views: 6,848
Posted By robinsonb5
So anyone up for creating a beat-em-up in the...

So anyone up for creating a beat-em-up in the Xiao Xiao style? :D
Forum: Hardware mods 07 March 2020, 18:15
Replies: 238
Views: 23,636
Posted By robinsonb5
The original version of TG68 (as used in early...

The original version of TG68 (as used in early ports of Minimig to the DE1 and DE2 dev boards) was 68000 only. The newer version can be configured to support 68020 instructions - but it can still be...
Forum: Amiga scene 28 February 2020, 11:01
Replies: 368
Views: 47,529
Posted By robinsonb5
Yeah I wasn't sure how the dithering is actually...

Yeah I wasn't sure how the dithering is actually done - is it simply that each texture pixel contains a pair of 16-colour pixels which average to something close to the original colour? If so, it...
Forum: Amiga scene 28 February 2020, 09:02
Replies: 368
Views: 47,529
Posted By robinsonb5
I think the dithering would be much improved if...

I think the dithering would be much improved if it were possible to "invert" the dither for alternating rows, so that the effect was more "chequerboard" than "stripes". The aim of dithering is to...
Forum: Coders. General 25 February 2020, 21:21
Replies: 6
Views: 700
Posted By robinsonb5
It's certainly an intriguing engine - I'm not...

It's certainly an intriguing engine - I'm not sure speedrunners is the best game for it, though, because it will do a poor job of rendering grappling hooks / lines! If we really want zooming, it...
Forum: Coders. General 25 February 2020, 19:52
Replies: 6
Views: 700
Posted By robinsonb5
I've been thinking about this too. I think we...

I've been thinking about this too. I think we would probably have to forego zooming, and use a tile-based map on a single bitplane. Probably 3 + 1 plane dual playfield mode, so we could draw a...
Forum: Nostalgia & memories 25 February 2020, 09:52
Replies: 7
Views: 1,246
Posted By robinsonb5
When they took several attempts to fix a friend's...

When they took several attempts to fix a friend's Amiga 600 back in the day, they quickly became known as "Kers".
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