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Forum: support.Hardware Today, 11:34
Replies: 23
Views: 1,084
Posted By robinsonb5
I don't think so, no - the only way I can imagine...

I don't think so, no - the only way I can imagine bad RAM chips causing scrambled DiagROM serial is if they're failing in such a way that their output drivers remain on when they shouldn't. If a...
Forum: News 30 June 2020, 09:43
Replies: 246
Views: 22,872
Posted By robinsonb5
Yeah that is really nice. In the 90s many of us...

Yeah that is really nice. In the 90s many of us would set ripped game music playing in a modplayer while working on other stuff just for general listening enjoyment - and these tracks would...
Forum: project.Amiga Game Factory 29 June 2020, 17:00
Replies: 136
Views: 10,451
Posted By robinsonb5
I didn't say I thought it was simple! ;) I was...

I didn't say I thought it was simple! ;) I was just wondering aloud, really.





I knew the frequencies were odd - I didn't know about the DDFSTRT (and actually don't know enough about that...
Forum: project.Amiga Game Factory 29 June 2020, 15:09
Replies: 136
Views: 10,451
Posted By robinsonb5
Is there any scope for running this flicker-free...

Is there any scope for running this flicker-free in a DblNTSCs style screenmode?
(I'm not sure what implications that would have for sprites - but only needing 512 pixels horizontally might make it...
Forum: Retrogaming General Discussion 29 June 2020, 15:04
Replies: 51
Views: 1,492
Posted By robinsonb5
The only counterpoint I'd make - and this may be...

The only counterpoint I'd make - and this may be part of the reason why peoples' expectations are unreasonably high - is that we have much better access to information and much better tools at...
Forum: Amiga scene 28 June 2020, 23:05
Replies: 100
Views: 15,715
Posted By robinsonb5
It looks gorgeous - I see a lot of references to...

It looks gorgeous - I see a lot of references to Shadow of the Beast (though I'm sure this will have better gameplay) - it seems like this will be more of a sequel to that game than its actual...
Forum: Amiga scene 28 June 2020, 17:39
Replies: 7
Views: 534
Posted By robinsonb5
No, but for a game as old as Cannon Fodder it's...

No, but for a game as old as Cannon Fodder it's much more likely that they do - I'd be surprised if the musicians had retained any rights in Cannon Fodder's music. A "work for hire" (or the UK...
Forum: project.Amiga Game Factory 27 June 2020, 23:40
Replies: 136
Views: 10,451
Posted By robinsonb5
Nice - thanks for the update. Enjoyed the...

Nice - thanks for the update. Enjoyed the technical stuff too!
Forum: support.Hardware 27 June 2020, 10:57
Replies: 23
Views: 1,084
Posted By robinsonb5
That's annoying. Hopefully you'll be able to...

That's annoying. Hopefully you'll be able to find a better solution.


(By far the cheapest diagnostic tool I have is a simple crystal radio earpiece. They're very high impedance so shouldn't...
Forum: support.Hardware 26 June 2020, 20:45
Replies: 23
Views: 1,084
Posted By robinsonb5
Just that since the CPU's own bus seems to be...

Just that since the CPU's own bus seems to be working (since the ROM works), the chipset / RAM bus isn't working and the point where the two join is where the worst of the corrosion happened, it...
Forum: support.Hardware 26 June 2020, 10:17
Replies: 23
Views: 1,084
Posted By robinsonb5
Do you have the facilities to burn your own ROMs?

Do you have the facilities to burn your own ROMs?
Forum: Retrogaming General Discussion 25 June 2020, 14:25
Replies: 26
Views: 997
Posted By robinsonb5
Wise words - would you care to impart that little...

Wise words - would you care to impart that little nugget of wisdom to the world of Twitter? ;)
Forum: News 24 June 2020, 20:13
Replies: 246
Views: 22,872
Posted By robinsonb5
As you say, HAM8 can adjust the upper 6 bits of...

As you say, HAM8 can adjust the upper 6 bits of each channel's colour, with the two least signficant bits being inherited from the most recently used palette entry. Since there are 64 base palette...
Forum: support.Hardware 24 June 2020, 16:27
Replies: 23
Views: 1,084
Posted By robinsonb5
OK, it looks to me like the ROM's reading fine...

OK, it looks to me like the ROM's reading fine since Kickstart gives you a greenscreen and DiagROM attempts to write to the serial port.

Since both ROMs are apparently hitting the right hardware...
Forum: Coders. Asm / Hardware 17 June 2020, 23:22
Replies: 5
Views: 534
Posted By robinsonb5
The hardware reference manual kind of assumes...

The hardware reference manual kind of assumes that you'll be using very short waveforms, whereas in practice we ended up using fairly sizeable sample for everything - so the HRM's examples aren't...
Forum: support.Hardware 16 June 2020, 18:54
Replies: 5
Views: 381
Posted By robinsonb5
Here you go - not pretty but it does work. ...

Here you go - not pretty but it does work.

Each of the original RAM chips has a second chip piggy-backed on top of it, with one leg bent out and connected to U32.

I only soldered the corner...
Forum: support.Hardware 16 June 2020, 17:55
Replies: 5
Views: 381
Posted By robinsonb5
Yes, it can be done by piggybacking the chips,...

Yes, it can be done by piggybacking the chips, bending out a couple of legs and connecting those elsewhere on the motherboard - I did this to my A500+ a few years back. I'll dig out the details when...
Forum: project.EAB 12 June 2020, 18:25
Replies: 122
Views: 16,937
Posted By robinsonb5
I'm genuinely sorry to see this - and have to say...

I'm genuinely sorry to see this - and have to say thank you for your efforts over the years.

Moderating a forum is never an easy task. I've done it once before - never again! So while I haven't...
Forum: Coders. General 06 June 2020, 00:13
Replies: 29
Views: 2,548
Posted By robinsonb5
Yes, likewise - it came as a bit of a revelation...

Yes, likewise - it came as a bit of a revelation to me when Toni mentioned it in another thread a year or so back!
Forum: Coders. General 05 June 2020, 20:46
Replies: 29
Views: 2,548
Posted By robinsonb5
That's the interesting thing - ECS Agnus *can*...

That's the interesting thing - ECS Agnus *can* see the trapdoor RAM - but it sees it at $80000, while the CPU sees it at $c00000. All the mod does is change the address of the trapdoor RAM.

(See...
Forum: support.Apps 05 June 2020, 12:49
Replies: 1
Views: 385
Posted By robinsonb5
Answering my own question, to a certain extent: ...

Answering my own question, to a certain extent:

Using filezap to edit overscan.prefs, I can change the 0x51 immediately after the ModeID to 0x41 to reclaim those leftmost 64 pixels, and edit the...
Forum: Coders. General 31 May 2020, 21:17
Replies: 29
Views: 2,548
Posted By robinsonb5
Just in case it wasn't clear, the blitter steals...

Just in case it wasn't clear, the blitter steals cycles from the CPU when the CPU's running from or accessing Chip RAM. Fast RAM, if present, is on a separate bus which isn't affected by the blitter.
Forum: support.Other 28 May 2020, 23:45
Replies: 4
Views: 320
Posted By robinsonb5
The VGAOnly driver does reduce how much of the...

The VGAOnly driver does reduce how much of the screen you can fill in multiscan modes - I found with my 1438 the best results came from DblNTSC without VGAOnly installed - but no, you can't...
Forum: Coders. C/C++ 27 May 2020, 21:16
Replies: 21
Views: 1,216
Posted By robinsonb5
Great to see you got it working. I look forward...

Great to see you got it working. I look forward to seeing what you create!
Forum: Retrogaming General Discussion 27 May 2020, 16:59
Replies: 324
Views: 22,429
Posted By robinsonb5
Realistically you're not going to have a detailed...

Realistically you're not going to have a detailed 3D background. In the interests of not having to update the entire screen's contents every frame, I think the background would have to be a...
Forum: Coders. C/C++ 24 May 2020, 12:23
Replies: 21
Views: 1,216
Posted By robinsonb5
But where does that jmp $6 come from? Is that...

But where does that jmp $6 come from? Is that from your code, or is it startup / library code? If the latter, have you tried linking without startup / c library?
Forum: Coders. C/C++ 24 May 2020, 11:50
Replies: 21
Views: 1,216
Posted By robinsonb5
I've just tried -mpcrel with m68k-elf-gcc and it...

I've just tried -mpcrel with m68k-elf-gcc and it does indeed seem to generate PC-relative code. What errors are you seeing with that option?



What exactly are you trying to do within the C...
Forum: Coders. C/C++ 24 May 2020, 10:15
Replies: 21
Views: 1,216
Posted By robinsonb5
Yeah that does make things a lot trickier. If...

Yeah that does make things a lot trickier. If the OS is still alive, one brute-force, ugly method might be to save the executable back out to RAM: and LoadSeg() it from there.


What's the...
Forum: Retrogaming General Discussion 24 May 2020, 10:02
Replies: 324
Views: 22,429
Posted By robinsonb5
It just creates a horrible fringe effect on every...

It just creates a horrible fringe effect on every pixel! Actually, no, it has a characteristic slightly-out-of-focus look, but it's not awful. See for yourself, if you wish - there's a little...
Forum: Coders. C/C++ 24 May 2020, 09:40
Replies: 21
Views: 1,216
Posted By robinsonb5
A long time ago I solved a similar problem by...

A long time ago I solved a similar problem by writing an AMOSPro extension which could load code modules (using LoadSeg() so with full relocation). My modules contained a header which the extension...
Forum: Retrogaming General Discussion 22 May 2020, 22:18
Replies: 324
Views: 22,429
Posted By robinsonb5
But you can group three pixels together,...

But you can group three pixels together, modifying first red, then green, then blue - which amounts to pretty much the same thing.




Copperchunky is cool - I've used it myself (though again,...
Forum: support.Apps 22 May 2020, 21:19
Replies: 1
Views: 385
Posted By robinsonb5
Workbench overscan

Does anyone know of a hack, utility or other method of forcing Workbench (3.1) to open its screen with VIDEO_OVERSCAN rather than TEXT_OVERSCAN?



I could have sworn I managed this years back on...
Forum: Retrogaming General Discussion 22 May 2020, 16:36
Replies: 324
Views: 22,429
Posted By robinsonb5
Ermmmm.... not quite. As you say, the base...

Ermmmm.... not quite. As you say, the base colours have eight bits of colour information per RGB channel so you have 24-bit freedom there.

However, HAM8 modifiers can only change the upper six...
Forum: Retrogaming General Discussion 22 May 2020, 00:13
Replies: 324
Views: 22,429
Posted By robinsonb5
A lot of AGA demos use this trick - in...

A lot of AGA demos use this trick - in conjunction with Chunky2Planar. It's pretty nice. If you're drawing to such a screen in realtime it's often easier to use groups of four pixels rather than...
Forum: Retrogaming General Discussion 19 May 2020, 01:00
Replies: 324
Views: 22,429
Posted By robinsonb5
I get the feeling that by the time the '060 came...

I get the feeling that by the time the '060 came along everyone was obsessed with doing texture-mapping and chunky-based effects - so I don't think there are many, if any, that really explore the...
Forum: Retrogaming General Discussion 18 May 2020, 21:18
Replies: 324
Views: 22,429
Posted By robinsonb5
The best way to deal with that would be to do...

The best way to deal with that would be to do input handling - including combo-detection - within a VBlank interrupt. The game loop would see combos as extra "buttons".
Forum: Coders. General 14 May 2020, 00:01
Replies: 0
Views: 387
Posted By robinsonb5
CPU detection and SysInfo

Does anyone happen to know how SysInfo detects a 68020 CPU (as opposed to a 68EC020?)
I'm tinkering with Minimig cores again, and I noticed that in both DiagROM and SysInfo the CPU was being...
Forum: Hardware mods 09 May 2020, 14:52
Replies: 305
Views: 37,472
Posted By robinsonb5
There was an interesting interview about the...

There was an interesting interview about the Clone-A project where he said that "everytime we’re fixing a bug, we discover that the fix actually produces a smaller design. It’s really amazing what...
Forum: Retrogaming General Discussion 07 May 2020, 19:46
Replies: 324
Views: 22,429
Posted By robinsonb5
Is there much original topic left at this point?...

Is there much original topic left at this point? :)


I think we have a pretty clear "Hell, no!" as an answer to the original question, with a more interesting question of "Could an...
Forum: Hardware mods 06 May 2020, 12:48
Replies: 23
Views: 3,063
Posted By robinsonb5
I think it would have to be arranged so that the...

I think it would have to be arranged so that the virtual Denise fetches as though from four high-res bitplanes, then reads a complete chunky pixel (or maybe pair of pixels) from each in turn?

...
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