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Forum: Amiga scene 23 February 2020, 11:38
Replies: 339
Views: 39,203
Posted By robinsonb5
Very nice work! Both on the engine and the video...

Very nice work! Both on the engine and the video - very impressive!
(How much memory does the engine need?)





I had no problem understanding what you were saying.
Forum: Coders. System 23 February 2020, 01:34
Replies: 9
Views: 322
Posted By robinsonb5
They should be disabled while the actual swap...

They should be disabled while the actual swap takes place (and while its documentation doesn't explicitly say so, I'd be astonished if the OS StackSwap() function doesn't take care of that), but once...
Forum: Coders. System 23 February 2020, 00:04
Replies: 9
Views: 322
Posted By robinsonb5
If you're working in C, something like this...

If you're working in C, something like this should do what you need: (Needs at least Kickstart 2.04)

/***************************************************************************
Example code...
Forum: Retrogaming General Discussion 22 February 2020, 01:20
Replies: 83
Views: 2,730
Posted By robinsonb5
What would it take to "fix" Xenon II? If someone...

What would it take to "fix" Xenon II? If someone were to rewrite the graphics routines and improve the framerate so that the ship responded with less obvious lag, would that be enough? Would it be...
Forum: Amiga scene 21 February 2020, 22:58
Replies: 18
Views: 1,401
Posted By robinsonb5
That's really cool - well done! I've just spent...

That's really cool - well done! I've just spent a fun few minutes playing with it. (I think it needs to be harder, though!)





Wow - that looks like great fun - something of that nature...
Forum: support.Hardware 20 February 2020, 01:49
Replies: 12
Views: 712
Posted By robinsonb5
I'm pretty sure these lines are an interference...

I'm pretty sure these lines are an interference pattern between the number of pixels the monitor is expecting to see in a line, and the number of pixels the Amiga actually produces. That's why...
Forum: Amiga scene 17 February 2020, 19:05
Replies: 25
Views: 1,856
Posted By robinsonb5
That's Super Hang On, not Hang On, though. ...

That's Super Hang On, not Hang On, though.

Provided the frame rate's high enough, "faster" just means moving further each frame, so shouldn't be beyond reach.
Forum: Retrogaming General Discussion 17 February 2020, 14:23
Replies: 9
Views: 350
Posted By robinsonb5
It sounds more like a particular crack, rather...

It sounds more like a particular crack, rather than a special edition!
Forum: Retrogaming General Discussion 16 February 2020, 15:42
Replies: 24
Views: 1,100
Posted By robinsonb5
Larger modules in ProTracker, playing large...

Larger modules in ProTracker, playing large module in the background while using other software, more applications with screens open simultaneously - to name just a few use cases. :)
Forum: Retrogaming General Discussion 16 February 2020, 00:00
Replies: 12
Views: 520
Posted By robinsonb5
Bear in mind that while the MiST and MiSTer are...

Bear in mind that while the MiST and MiSTer are related projects, they're not the same thing - and while I wouldn't expect the MiSTer's Minimig core to behave wildly differently, this thread has been...
Forum: Retrogaming General Discussion 14 February 2020, 19:52
Replies: 12
Views: 520
Posted By robinsonb5
It can be if the core's designed to be cycle...

It can be if the core's designed to be cycle accurate. There is a cycle-accurate MC68000 core called FX68 - and the Mistery Atari ST core uses it. (The Amiga's much less sensitive to cycle-accuracy...
Forum: Retrogaming General Discussion 14 February 2020, 15:35
Replies: 12
Views: 520
Posted By robinsonb5
No, it's not cycle-accurate - it just includes...

No, it's not cycle-accurate - it just includes some recent bugfixes to the TG68K CPU core.
Forum: Retrogaming General Discussion 14 February 2020, 12:54
Replies: 57
Views: 2,217
Posted By robinsonb5
Given that the target application seems to be...

Given that the target application seems to be performance in the context of playing chess, is this a possibility?...
Forum: Retrogaming General Discussion 14 February 2020, 11:17
Replies: 57
Views: 2,217
Posted By robinsonb5
Better yet, stick with the chess theme and use...

Better yet, stick with the chess theme and use the Queens problem? (Or a few hundred / thousand iterations of it on the Intel CPU!)

(It's a simple enough problem that anyone who objects to...
Forum: Hardware mods 11 February 2020, 21:31
Replies: 176
Views: 10,754
Posted By robinsonb5
My go-to performance test when tinkering with the...

My go-to performance test when tinkering with the Minimig was the game Zeewolf 2 - it makes good use of Fast RAM when available, and falls over quickly if the RAM or cache is buggy, so it's a good...
Forum: Retrogaming General Discussion 10 February 2020, 12:20
Replies: 93
Views: 3,616
Posted By robinsonb5
I'm pretty sure there was talk a couple of years...

I'm pretty sure there was talk a couple of years back about the Apollo core having multithreading capability. I've no idea how you would take advantage of it from user-code but it could potentially...
Forum: support.Hardware 10 February 2020, 11:01
Replies: 12
Views: 712
Posted By robinsonb5
It would be interesting to know whether this is...

It would be interesting to know whether this is down to Denise revisions, the video hybrid or something else. (I'm guessing you have revision -01 hybrid in the Rev 5 boards, and -03 in the 6As?)
...
Forum: Hardware mods 10 February 2020, 00:02
Replies: 176
Views: 10,754
Posted By robinsonb5
:shocked Are you building it in the steampunk...

:shocked Are you building it in the steampunk style?! :shocked
Forum: Hardware mods 08 February 2020, 17:10
Replies: 176
Views: 10,754
Posted By robinsonb5
I've not explored that in any detail but I...

I've not explored that in any detail but I believe it simply emits the lower four bits of any write to CACR on the CACR_out signal. It would be trivial to extend that to support instruction cache...
Forum: Hardware mods 08 February 2020, 10:19
Replies: 176
Views: 10,754
Posted By robinsonb5
Impressive! (I'm also retroactively much more...

Impressive!
(I'm also retroactively much more impressed with the previous score now I know you didn't yet have an instruction cache!)
Forum: Hardware mods 06 February 2020, 20:38
Replies: 176
Views: 10,754
Posted By robinsonb5
Maybe add one more degree of separation, and name...

Maybe add one more degree of separation, and name it after Joss Whedon's other masterpiece - Firefly? :D
Forum: support.Hardware 05 February 2020, 14:20
Replies: 17
Views: 639
Posted By robinsonb5
Long-story-short: Yes, it's safe on an Amiga. ...

Long-story-short: Yes, it's safe on an Amiga. (Not safe on a C64 though.)
Forum: Amiga scene 05 February 2020, 14:17
Replies: 18
Views: 563
Posted By robinsonb5
Have you considered a firmware option to rotate...

Have you considered a firmware option to rotate the controls 180 degrees? If you could change that on the fly, then the same joystick can be used by left- or right- handers just by turning the...
Forum: Hardware mods 04 February 2020, 10:08
Replies: 176
Views: 10,754
Posted By robinsonb5
Ah, I see what you mean now. Yes, indeed. ...

Ah, I see what you mean now. Yes, indeed.





LOL - well you're certainly doing a good job of creating intrigue! :D


I look forward to learning more as the project progresses!
Forum: Hardware mods 04 February 2020, 01:03
Replies: 176
Views: 10,754
Posted By robinsonb5
If you're saying that nothing at the time could...

If you're saying that nothing at the time could have achieved 8.8 MIPS in SysInfo then I must respectfully disagree. I was tinkering with the Minimig core on Cylone II and III FPGAs back then...
Forum: Hardware mods 03 February 2020, 23:05
Replies: 176
Views: 10,754
Posted By robinsonb5
The Vampire 1 was groundbreaking (Tobias Gubener...

The Vampire 1 was groundbreaking (Tobias Gubener had done something similar using a DE2 devboard some years previously - but I think that was the only prior example of replacing the Amiga's CPU with...
Forum: Hardware mods 03 February 2020, 19:12
Replies: 176
Views: 10,754
Posted By robinsonb5
Really cool - nice work! Are you planning on...

Really cool - nice work!
Are you planning on using the same FPGA for production boards, or something newer / larger / smaller / cheaper?
Forum: Amiga scene 02 February 2020, 11:12
Replies: 1,018
Views: 64,811
Posted By robinsonb5
Don't forget that 3.5in drives needed more power...

Don't forget that 3.5in drives needed more power than their smaller counterparts, and tended to run hotter. Plenty of people might have got away with using such a drive, but there's a big difference...
Forum: Coders. C/C++ 27 January 2020, 15:31
Replies: 2
Views: 309
Posted By robinsonb5
You'll need a vbcc backend that emits ARM...

You'll need a vbcc backend that emits ARM assembly, which vasm will in turn assemble into object code.

VBCC has a really neat backend interface, and it's well documented too - see...
Forum: Coders. Asm / Hardware 27 January 2020, 11:27
Replies: 9
Views: 437
Posted By robinsonb5
I think what Kamelito's asking for here is for...

I think what Kamelito's asking for here is for the assembler to warn when the scheduling of consecutive instructions is suboptimal for the target CPU (i.e. hazards and bubbles), rather than anything...
Forum: Coders. General 19 January 2020, 10:36
Replies: 4
Views: 373
Posted By robinsonb5
I think I still have a dusty mingw32 install on...

I think I still have a dusty mingw32 install on one machine - I'll have a look shortly...

EDIT: Yes, it turns out I do. SplitMod.zip (built from phx's source in the previous post) is now zoned!
Forum: Coders. General 19 December 2019, 01:02
Replies: 17
Views: 1,111
Posted By robinsonb5
Wow - that's a classy move - massive respect!

Wow - that's a classy move - massive respect!
Forum: Nostalgia & memories 19 December 2019, 00:21
Replies: 12
Views: 972
Posted By robinsonb5
I remember enjoying the diary entries in Wings...

I remember enjoying the diary entries in Wings back in the day.
Forum: Coders. Asm / Hardware 14 December 2019, 17:55
Replies: 6
Views: 407
Posted By robinsonb5
True enough - but being able to derive the same...

True enough - but being able to derive the same result in multiple ways is good for understanding!


(It may be designed for plotting lines on a 2D grid, but in that context one of the two...
Forum: Coders. Asm / Hardware 14 December 2019, 16:48
Replies: 6
Views: 407
Posted By robinsonb5
This could also be done with a version of...

This could also be done with a version of Bresenham's line-drawing algorithm.
Imagine U1=0, U2=20, Y1=0, Y2=32, so a non-integral ratio.

dU=20, dY=32
V=0, c=0, where V is the output line for...
Forum: Coders. General 05 December 2019, 18:20
Replies: 574
Views: 48,669
Posted By robinsonb5
Excellent - keep it up, and show us the progress...

Excellent - keep it up, and show us the progress as it happens - how long it takes doesn't matter. Just have fun with the project - it's guaranteed that you'll learn loads in the process, whatever...
Forum: Coders. General 05 December 2019, 16:10
Replies: 574
Views: 48,669
Posted By robinsonb5
Yes, but only if you *do* it, instead of just...

Yes, but only if you *do* it, instead of just talking about it. ;)
Forum: Retrogaming General Discussion 05 December 2019, 09:57
Replies: 269
Views: 58,191
Posted By robinsonb5
It's awesome to see more progress on this project...

It's awesome to see more progress on this project - but the download link seems to be broken? (Did the forum software remove whatever should have been between "www." and ".com"?)
Forum: Retrogaming General Discussion 11 November 2019, 15:57
Replies: 50
Views: 3,772
Posted By robinsonb5
Yes, but that increase is acheived by shovelling...

Yes, but that increase is acheived by shovelling in more cores rather than improving the throughput of a single core.

Even if improving single-core performance were easily achievable, there's not...
Forum: support.Hardware 05 November 2019, 20:33
Replies: 5
Views: 234
Posted By robinsonb5
Are you sure you're not just measuring the...

Are you sure you're not just measuring the resistance across a shiny new (and presumably fully-discharged) capacitor that your multimeter is desperately trying to charge?
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