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Forum: Retrogaming General Discussion 14 January 2021, 15:26
Replies: 139
Views: 5,947
Posted By robinsonb5
Still 7MHz, but the horizontal frequency is...

Still 7MHz, but the horizontal frequency is higher so there are fewer clocks per line. (Also 160x200 is scandoubled, there are 400 lines).


Keep the sync timings the same but use the 28Mhz clock...
Forum: Retrogaming General Discussion 14 January 2021, 11:45
Replies: 139
Views: 5,947
Posted By robinsonb5
You can certainly create such a mode - but...

You can certainly create such a mode - but whether you can find a monitor capable of displaying it is another matter entirely!


The problem is the Amiga chipset has very few options when it comes...
Forum: Amiga scene 12 January 2021, 18:49
Replies: 196
Views: 26,416
Posted By robinsonb5
It's easy to confuse MiST and MiSTer - MiST is a...

It's easy to confuse MiST and MiSTer - MiST is a custom-built board with a smallish FPGA and VGA output. MiSTer is a project that bolts addon-boards onto an off-the-peg development board, but it has...
Forum: Retrogaming General Discussion 11 January 2021, 01:06
Replies: 139
Views: 5,947
Posted By robinsonb5
No-one can fit that many bugs in only 10mb.

No-one can fit that many bugs in only 10mb.
Forum: Coders. C/C++ 07 January 2021, 10:56
Replies: 7
Views: 1,800
Posted By robinsonb5
The experimental ARM code is in the source...

The experimental ARM code is in the source snapshot on Volker Barthelmann's site: http://www.compilers.de/vbcc.html - but I believe it was only preliminary, it's not yet in a useful state. I asked...
Forum: Coders. Asm / Hardware 02 January 2021, 23:59
Replies: 323
Views: 12,865
Posted By robinsonb5
Well when it "just" means the most common method...

Well when it "just" means the most common method of making music on the Amiga - varying the sample period to change the pitch of the note - will miss the ideal pitch, it's not unreasonable to say...
Forum: Coders. Asm / Hardware 02 January 2021, 20:52
Replies: 323
Views: 12,865
Posted By robinsonb5
Within 1 cent of the desired pitch. A scale...

Within 1 cent of the desired pitch.

A scale of frequencies based upon the 12th root of 2.

If you're going to use the sample period to play a single sample back at different pitches, the...
Forum: Coders. General 01 January 2021, 20:38
Replies: 22
Views: 1,680
Posted By robinsonb5
Given how sluggish Xenon 2 feels, do we want to...

Given how sluggish Xenon 2 feels, do we want to respect timing? I think it'd be massively improved running at double speed!
(It doesn't run at 25fps though, does it? Isn't it 17.5fps?)
Forum: Amiga scene 20 December 2020, 20:46
Replies: 13
Views: 1,126
Posted By robinsonb5
The off-world exclusion is reasonable when you...

The off-world exclusion is reasonable when you consider what the shipping costs might be.
Forum: support.Other 20 December 2020, 20:36
Replies: 5
Views: 450
Posted By robinsonb5
Maybe it's booting from the Buddha but coming up...

Maybe it's booting from the Buddha but coming up in the wrong screenmode because the ZZ9000's not initialised? Or maybe there's a boot drive on the internal IDE and other drives on the Buddha?
Forum: Coders. Asm / Hardware 16 December 2020, 11:57
Replies: 323
Views: 12,865
Posted By robinsonb5
I don't see anything wrong with exploring ideas,...

I don't see anything wrong with exploring ideas, and changing rules, provided of course that you're not demanding that anyone else should play by your new rules!



If nothing else, by...
Forum: Coders. Asm / Hardware 14 December 2020, 23:36
Replies: 323
Views: 12,865
Posted By robinsonb5
For what it's worth I did read the whole...

For what it's worth I did read the whole discussion, and have found it interesting even if I haven't had any useful input to add. I can't really be sure whether I'd find your additions useful...
Forum: Coders. Asm / Hardware 12 December 2020, 22:33
Replies: 323
Views: 12,865
Posted By robinsonb5
You guys might find the forum at anycpu.org...

You guys might find the forum at anycpu.org interesting.
Forum: support.Hardware 12 December 2020, 21:58
Replies: 9
Views: 585
Posted By robinsonb5
I'm only guessing here, but the original code...

I'm only guessing here, but the original code does repeated reads of CIA registers as a crude timing method. (Real CIAs run on the E clock which the 68000 provides as a slow clock for legacy...
Forum: Retrogaming General Discussion 11 December 2020, 18:58
Replies: 6
Views: 425
Posted By robinsonb5
It's certainly not accurate, but it's not "fake"...

It's certainly not accurate, but it's not "fake" in the sense that anyone is trying to be misleading.

Sysinfo calculates the CPU speed using logic along the lines of "a 68020 takes this many...
Forum: News 07 December 2020, 01:55
Replies: 647
Views: 124,138
Posted By robinsonb5
I don't mean to make excuses for anyone - because...

I don't mean to make excuses for anyone - because this undeniably sucks for everyone - but since I'm toying with the idea of dipping a toe in custom keyboard waters I've been reading a bit about...
Forum: News 07 November 2020, 18:55
Replies: 183
Views: 30,548
Posted By robinsonb5
Nothing to report as yet, I'm afraid. I've...

Nothing to report as yet, I'm afraid. I've exchanged a few emails with Valentin and have a clearer idea now what's possible and what isn't on the Flea board. In short, AGA maybe, RTG almost...
Forum: Hardware mods 05 November 2020, 17:47
Replies: 459
Views: 71,540
Posted By robinsonb5
Good idea:...

Good idea: https://github.com/TobiFlex/TG68K.C/commits/master


Quite a bit of activity recently, actually, with contributions from several people other than the author.




Yes, that's...
Forum: Coders. Asm / Hardware 02 November 2020, 23:54
Replies: 4
Views: 560
Posted By robinsonb5
Thanks Toni - I knew this was the right place to...

Thanks Toni - I knew this was the right place to ask!
Forum: Coders. Asm / Hardware 02 November 2020, 22:47
Replies: 4
Views: 560
Posted By robinsonb5
Thank you - I'd hoped that was the case!

Thank you - I'd hoped that was the case!
Forum: Coders. Asm / Hardware 02 November 2020, 22:18
Replies: 4
Views: 560
Posted By robinsonb5
Border sprites and border blanking?

I'm fixing up a Minimig bug and wondering if someone could tell me what the correct behaviour should be. (I've learned the hard way not to make assumptions about how hardware behaves in corner...
Forum: Retrogaming General Discussion 02 November 2020, 00:11
Replies: 5
Views: 745
Posted By robinsonb5
This one? ...

This one?

https://www.youtube.com/watch?v=17w61JLvbmQ
Forum: support.Hardware 30 October 2020, 14:20
Replies: 55
Views: 3,433
Posted By robinsonb5
Yet another option to consider - as if there...

Yet another option to consider - as if there weren't enough already - Stephen Jones from the Checkmate A1500 case project is testing a Mini-ITX UnAmiga variant.
Forum: News 27 October 2020, 00:10
Replies: 235
Views: 40,547
Posted By robinsonb5
Great, thanks for pasting. But I'm still...

Great, thanks for pasting. But I'm still confused because I'm sure that text isn't in the archive that's on the icomp wiki!


Download the lha file at...
Forum: News 26 October 2020, 22:28
Replies: 235
Views: 40,547
Posted By robinsonb5
Thanks - I have already downloaded the new...

Thanks - I have already downloaded the new CardDevelop.lha - I see the reference implementation in the Cirrus chip but the actual documentation file, PrivateInclude/CardDevelop.html doesn't seem to...
Forum: News 25 October 2020, 23:44
Replies: 235
Views: 40,547
Posted By robinsonb5
Could you tell me where to find the updated API...

Could you tell me where to find the updated API documentation, please? I downloaded the new CardDevelop.lha today but the PrivateInclude/CardDevelop.html file doesn't seem to have any mention of the...
Forum: Coders. Asm / Hardware 25 October 2020, 01:03
Replies: 7
Views: 715
Posted By robinsonb5
You might find it useful to set the workbench in...

You might find it useful to set the workbench in Multiscan Productivity mode, then run MonEd so you can see what the various parameters are set to. (Divide the VB/VS parameters by the number of...
Forum: Coders. Asm / Hardware 20 October 2020, 00:42
Replies: 68
Views: 3,456
Posted By robinsonb5
Maybe simple IIR filters, then? (out_new =...

Maybe simple IIR filters, then?
(out_new = (out_old + in) >> 1; or maybe out_new = (out_old + 7*in) >> 3;)

It should be cheaper to compute than linear interpolation, and you could...
Forum: Coders. Asm / Hardware 19 October 2020, 22:55
Replies: 68
Views: 3,456
Posted By robinsonb5
Have you considered mixing at, say, four times...

Have you considered mixing at, say, four times the target frequency, then using a simple running-average (so just addition and shifting) as a low-pass filter to downsample the complete mix? It won't...
Forum: Retrogaming General Discussion 19 October 2020, 00:43
Replies: 83
Views: 4,325
Posted By robinsonb5
Sure, which is why in my first response in this...

Sure, which is why in my first response in this thread I said I'd have more fun with the A500 so would choose that! :)


(Has anyone used the PC version of DPaint, by the way? How does it...
Forum: Retrogaming General Discussion 18 October 2020, 23:06
Replies: 83
Views: 4,325
Posted By robinsonb5
Thanks, I understand now. When you spoke about...

Thanks, I understand now. When you spoke about "fairness" I thought you meant that you felt comparing an A500 to a 286 was unfair to the PC.


True - though there are plenty of games that look...
Forum: Retrogaming General Discussion 18 October 2020, 19:52
Replies: 83
Views: 4,325
Posted By robinsonb5
Now that's interesting, too - I got an A500 in...

Now that's interesting, too - I got an A500 in 1990, but up until then I'd been using a C64 with diskdrive, printer and GEOS - and I actually found it quite frustrating that I didn't have a word...
Forum: Retrogaming General Discussion 18 October 2020, 18:29
Replies: 83
Views: 4,325
Posted By robinsonb5
I'm interested that you think that - and I'd like...

I'm interested that you think that - and I'd like to hear more about why.


There's a difference, I suppose, between comparing an Amiga 500 available in 1987 with a 386 also available in 1987, and...
Forum: Retrogaming General Discussion 16 October 2020, 11:33
Replies: 83
Views: 4,325
Posted By robinsonb5
I chose A500 for the simple reason that I,...

I chose A500 for the simple reason that I, personally, would have more fun with it. Had the scenario included the need to do anything productive I might have answered differently.
Forum: Coders. General 13 October 2020, 21:01
Replies: 790
Views: 72,127
Posted By robinsonb5
Please do - an in-depth insight into how...

Please do - an in-depth insight into how programming for the ST differs from the Amiga would be really interesting!
Forum: Nostalgia & memories 12 October 2020, 22:09
Replies: 292
Views: 14,188
Posted By robinsonb5
At the risk of sparking that 3.9 vs 3.1.4...

At the risk of sparking that 3.9 vs 3.1.4 flamewar you were worried about, PrepareEmul isn't needed with 3.1.4. That's how I finally got Shapeshifter running under Minimig.
Forum: support.Hardware 12 October 2020, 17:13
Replies: 47
Views: 2,087
Posted By robinsonb5
I'm having a hard time seeing how that's...

I'm having a hard time seeing how that's possible, since the CPU drives that pin! Are you absolutely sure you had the correct CPU pin? (There's a VCC pin between A20 and A21 on the CPU)


Or is...
Forum: Nostalgia & memories 11 October 2020, 22:58
Replies: 292
Views: 14,188
Posted By robinsonb5
Not to mention far too may lens flares! But...

Not to mention far too may lens flares!

But the real point to all of this isn't that the PC eventually overtook the Amiga as the platform of choice for all this - it's that the Amiga was where...
Forum: Nostalgia & memories 11 October 2020, 22:29
Replies: 292
Views: 14,188
Posted By robinsonb5
I thought they had some render farms with MIPS...

I thought they had some render farms with MIPS CPUs running Windows NT at some point - or maybe that was just another option that was available?
Edit: Yeah, I'm thinking of the Screamer. Don't know...
Forum: Nostalgia & memories 11 October 2020, 12:50
Replies: 312
Views: 17,785
Posted By robinsonb5
Yes, I suppose I was being overly cynical in my...

Yes, I suppose I was being overly cynical in my post - mostly because the rare cases of conflict are the ones that you notice most. Even in the Epic vs. Apple court case going on right now, the...
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