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Forum: Hardware mods 17 June 2021, 11:45
Replies: 196
Views: 31,361
Posted By robinsonb5
Fair enough - and I'd always advocate modifying...

Fair enough - and I'd always advocate modifying the DB23 to VGA adapter rather than the Amiga itself, in case that wasn't obvious.
Forum: Hardware mods 17 June 2021, 11:03
Replies: 196
Views: 31,361
Posted By robinsonb5
That's absolutely right, but doesn't explain why...

That's absolutely right, but doesn't explain why the jailbars appear in areas of solid colour. If the Amiga's video output was clean there'd be no variation in signal level over the duration of a...
Forum: Hardware mods 17 June 2021, 09:51
Replies: 196
Views: 31,361
Posted By robinsonb5
The jailbars are caused by the /C1 signal on pin...

The jailbars are caused by the /C1 signal on pin 15 of the 23-pin video port which is just left dangling and thus acts as a nice little antenna. Terminating that pin with a 47Ohm resistor to digital...
Forum: Coders. General 15 June 2021, 12:00
Replies: 59
Views: 3,589
Posted By robinsonb5
What you're looking for are called the Access...

What you're looking for are called the Access Control Registers on EC030 - see page 23 (1-12) of this document: https://www.nxp.com/files-static/archives/doc/ref_manual/M68000PRM.pdf
Forum: News 13 June 2021, 11:55
Replies: 27
Views: 8,041
Posted By robinsonb5
Maybe it's time for FreeWheel Lite, then,...

Maybe it's time for FreeWheel Lite, then, removing the gadget scroll functions but keeping click-and-roll window depth arrange, mouse scaling, etc.
Forum: Hardware mods 12 June 2021, 18:52
Replies: 58
Views: 6,683
Posted By robinsonb5
To be fair in the vast majority of cases that...

To be fair in the vast majority of cases that breakage was due to the more stringent memory alignment requirements and (for non-system-friendly software at least) could be fixed with a small wrapper...
Forum: News 11 June 2021, 19:57
Replies: 27
Views: 8,041
Posted By robinsonb5
I would expect that you'll still need the actual...

I would expect that you'll still need the actual wheel driver, but won't need FreeWheel any more.
Forum: Coders. General 07 June 2021, 19:40
Replies: 495
Views: 39,246
Posted By robinsonb5
Isn't data cache disallowed for Chip RAM though? ...

Isn't data cache disallowed for Chip RAM though? (The CPU reading data that the blitter or disk DMA has written gets way more complicated if there's a data cache.)


That's interesting - can you...
Forum: Coders. General 05 June 2021, 12:44
Replies: 495
Views: 39,246
Posted By robinsonb5
Here's litwr's commit history for the Amiga...

Here's litwr's commit history for the Amiga version - he's certainly incorporated many if not all of the optimisations suggested in this thread:...
Forum: Amiga scene 03 June 2021, 16:46
Replies: 15
Views: 1,424
Posted By robinsonb5
I have to say the art style in these designs is...

I have to say the art style in these designs is superb! :great

I wouldn't use current limiting resistors on the POTX/Y pins in digi mode, because those pins are finicky - on some A1200...
Forum: Amiga scene 03 June 2021, 13:56
Replies: 29
Views: 2,022
Posted By robinsonb5
Oh don't get me started on Firefox and modern...

Oh don't get me started on Firefox and modern Linux. I had a box running a Mint13 (Mate) distro, working so well it hadn't occurred to me that the distro was old and obsolete until.... firefox...
Forum: Amiga scene 02 June 2021, 20:42
Replies: 15
Views: 1,424
Posted By robinsonb5
The buttons probably will need calibration too -...

The buttons probably will need calibration too - also bear in mind that the analogue counters are dependent upon screenmode. As long as a game's running in PAL or NTSC then it'll be consistent, but...
Forum: Member Introductions 01 June 2021, 21:04
Replies: 2
Views: 596
Posted By robinsonb5
Welcome! I love the C64 (especially soundwise)...

Welcome! I love the C64 (especially soundwise) as well as the Amiga - great stuff!
Forum: Coders. Asm / Hardware 31 May 2021, 22:38
Replies: 24
Views: 2,051
Posted By robinsonb5
LOL - that will probably be the one and only...

LOL - that will probably be the one and only occasion in my entire life when I'm likened to a rapper!





Glad to hear it worked out - thanks for a fun puzzle!
Forum: New to Emulation or Amiga scene 31 May 2021, 16:45
Replies: 59
Views: 8,018
Posted By robinsonb5
Ah, yes indeed - you're probably right :)

Ah, yes indeed - you're probably right :)
Forum: Coders. Asm / Hardware 31 May 2021, 16:26
Replies: 24
Views: 2,051
Posted By robinsonb5
Oh I see - the sense of the output is inverted. I...

Oh I see - the sense of the output is inverted. I thought you were talking about something more fundamental that I was overlooking (and of course there still might be, but I do believe the algorithm...
Forum: New to Emulation or Amiga scene 31 May 2021, 15:44
Replies: 59
Views: 8,018
Posted By robinsonb5
MiST's certainly not the cheapest option (though...

MiST's certainly not the cheapest option (though the Spanish clones are pretty cheap) - but I wouldn't call it "convoluted". MiSTer is undeniably good value, but it's still not *that* cheap once...
Forum: Coders. Asm / Hardware 31 May 2021, 15:07
Replies: 24
Views: 2,051
Posted By robinsonb5
LOL - OK, what am I missing? This testbench...

LOL - OK, what am I missing?

This testbench tests all eight permutations of +/- Lo/Hi for each operand, and gives the expected result? (0xaa in D1 at the end, or 0x55 if you reverse HI and LO)
...
Forum: Coders. Asm / Hardware 31 May 2021, 13:10
Replies: 24
Views: 2,051
Posted By robinsonb5
OK this one works, I think: move.l...

OK this one works, I think:


move.l objectListAcc(a2),d7 ; get x- and y-acceleration
move.w d7,d0 ; fetch y-acceleration in world
move.w...
Forum: Coders. Asm / Hardware 31 May 2021, 12:44
Replies: 24
Views: 2,051
Posted By robinsonb5
Yeah, I see it now - I think I'm still confused...

Yeah, I see it now - I think I'm still confused about exactly how the carry flag works on 68k!
Forum: Coders. Asm / Hardware 31 May 2021, 12:05
Replies: 24
Views: 2,051
Posted By robinsonb5
Gah - I said beware of typos - my "scc"s should...

Gah - I said beware of typos - my "scc"s should be "scs"!


With that correction made, would it work, or is there still something I'm missing?
Forum: Coders. Asm / Hardware 31 May 2021, 10:57
Replies: 24
Views: 2,051
Posted By robinsonb5
If you don't actually need the absolute values...

If you don't actually need the absolute values once the comparison is done (and assuming the acceleration values are always less than half the range of a word), you could both add and subtract the...
Forum: Retrogaming General Discussion 30 May 2021, 10:42
Replies: 28
Views: 2,711
Posted By robinsonb5
You mean the dryad / nymph isn't a standard...

You mean the dryad / nymph isn't a standard feature? Amiga suxxx! ;)
Forum: Amiga scene 29 May 2021, 11:06
Replies: 15
Views: 4,590
Posted By robinsonb5
Not bad, as such - just cliché. By the early 90s...

Not bad, as such - just cliché. By the early 90s there were *so* many samples out there - and the hardware to make your own was relatively affordable - that the ST-01 samples became associated with...
Forum: Nostalgia & memories 28 May 2021, 15:42
Replies: 6
Views: 842
Posted By robinsonb5
I'm not sure I'd call it a gimmick - this concept...

I'm not sure I'd call it a gimmick - this concept (overlaying a writable filesystem onto a read-only filesystem) is how Linux LiveCDs handle persistent storage to this day.

This software was years...
Forum: Coders. General 27 May 2021, 20:12
Replies: 495
Views: 39,246
Posted By robinsonb5
That, my friend, is what comments are for. :) ...

That, my friend, is what comments are for. :)


Reduced readability is an expected side-effect of optimisation - hence the saying "premature optimisation is the root of all evil".
Forum: News 25 May 2021, 20:04
Replies: 891
Views: 112,136
Posted By robinsonb5
Looks great - it's detailed without being...

Looks great - it's detailed without being overwhelming, it's well presented - excellent! :great
Forum: support.Hardware 25 May 2021, 15:33
Replies: 7
Views: 487
Posted By robinsonb5
The six pin keyboard connector on the left of the...

The six pin keyboard connector on the left of the machine is also a serial port - so there's the potential to connect a MIDI interface there.

I think the levels are TTL rather than RS232, though...
Forum: Coders. General 23 May 2021, 21:13
Replies: 495
Views: 39,246
Posted By robinsonb5
:laughing Such is life - it's all good :) ...

:laughing Such is life - it's all good :)

The funniest part is how much effort and energy we've all expended over two bytes!

It has been an interesting thread, though - I love that we can...
Forum: Coders. General 23 May 2021, 20:43
Replies: 495
Views: 39,246
Posted By robinsonb5
That's all well and good, but you haven't counted...

That's all well and good, but you haven't counted the swap at the start of the listing, the $4843 at address $ce.





Yes, indeed, I see the 0x104 - however, the 0x5544 at 0x102 is *not* the...
Forum: Coders. General 22 May 2021, 19:38
Replies: 495
Views: 39,246
Posted By robinsonb5
It's very simple: F00:0160 .longdiv ...

It's very simple:

F00:0160 .longdiv
F00:0161 if __VASM&28 ;68020/30?
F00:0162 divul d4,d7:d3
F00:0163 else
F00:0164 swap d3
...
Forum: support.Hardware 22 May 2021, 14:19
Replies: 1
Views: 186
Posted By robinsonb5
I think it means that multi-button joysticks can...

I think it means that multi-button joysticks can masquerade as a CD32 pad, and that some CD32 games will run using the same methods you'd use to run them on a real A1200 with CD drive.

There's no...
Forum: Amiga scene 20 May 2021, 00:22
Replies: 21
Views: 2,068
Posted By robinsonb5
While on the surface I can see why you might...

While on the surface I can see why you might believe that, do bear in mind that your assessment is based purely on what was said publicly - we don't know what was said privately between the disputing...
Forum: Amiga scene 14 May 2021, 23:24
Replies: 131
Views: 11,928
Posted By robinsonb5
Gotek equivalent for CDROM images!

Gotek equivalent for CDROM images!
Forum: Amiga scene 11 May 2021, 20:26
Replies: 131
Views: 11,928
Posted By robinsonb5
That's the exact problem the Amiga's Device...

That's the exact problem the Amiga's Device system exists to solve - a common interface where an application can specify a device name for specific hardware, and unit number for a specific instance...
Forum: Amiga scene 10 May 2021, 23:42
Replies: 131
Views: 11,928
Posted By robinsonb5
I think I'd divide that a bit more, actually: AGA...

I think I'd divide that a bit more, actually: AGA with '020/'030 is mid-range, '040 / '060 / RTG is high spec, and then Vampire / Buffee / PiStorm are futuristic.

My vote would be to target low...
Forum: Retrogaming General Discussion 10 May 2021, 18:11
Replies: 10
Views: 858
Posted By robinsonb5
Yes :) Washing machines. It used to...

Yes :)


Washing machines.

It used to be possible to replace the bearings when they died. Not any more - they're expressly designed to make that difficult.

Cars.

Parts that can't be...
Forum: support.Hardware 07 May 2021, 23:44
Replies: 37
Views: 5,248
Posted By robinsonb5
When you say "disk access", do you mean floppy...

When you say "disk access", do you mean floppy disk, HDFs or both? Does it make any difference if you're reading or writing?

(Wasn't there a hardware mod of some kind which allowed the SPI speed...
Forum: Hardware mods 04 May 2021, 16:31
Replies: 102
Views: 13,496
Posted By robinsonb5
I can't now, but I could a few minutes ago - it...

I can't now, but I could a few minutes ago - it was massive, though! (And very exciting!)
Forum: Coders. Asm / Hardware 04 May 2021, 00:32
Replies: 92
Views: 5,727
Posted By robinsonb5
Yes indeed - I did LoadView(NULL), a 10 second...

Yes indeed - I did LoadView(NULL), a 10 second delay, then restored the display.
While the screen's hidden I can activate other windows, and type into them.
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