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Forum: Retrogaming General Discussion 13 May 2022, 14:19
Replies: 12
Views: 664
Posted By robinsonb5
I loved the Space Harrier arcade as a kid - but I...

I loved the Space Harrier arcade as a kid - but I can't really argue with the "loud fast mess" description of Afterburner, and even more so Galaxy Force II which was amazing to look at and absolutely...
Forum: Nostalgia & memories 06 May 2022, 14:23
Replies: 28
Views: 1,980
Posted By robinsonb5
It did have one easily-overlooked advantage - a...

It did have one easily-overlooked advantage - a high-res flicker-free screenmode that was not just supported but expected by the software. OK, you needed the special monitor - but in a professional...
Forum: Coders. Asm / Hardware 04 May 2022, 00:03
Replies: 21
Views: 1,203
Posted By robinsonb5
I guess the easiest way would be the specify the...

I guess the easiest way would be the specify the -no-opt flag, so you get exactly the code you asked for. (Without it, the JMP will be turned into a BRA even without the -pic option just because...
Forum: Coders. Asm / Hardware 03 May 2022, 23:27
Replies: 21
Views: 1,203
Posted By robinsonb5
What the -pic flag actually does is disallow...

What the -pic flag actually does is disallow relocations, not absolute addresses. Because you've specified the starting location with ORG, it knows exactly where in memory the label "loop" will be,...
Forum: support.Hardware 01 May 2022, 17:37
Replies: 9
Views: 940
Posted By robinsonb5
That line of logic only works if you're using an...

That line of logic only works if you're using an adapter. Without an adapter the pad is attempting to draw power from a signal pin, which might work but it's out of specification, so there's no...
Forum: Retrogaming General Discussion 16 April 2022, 22:27
Replies: 59
Views: 3,711
Posted By robinsonb5
That was my impression of the C16 until I started...

That was my impression of the C16 until I started tinkering with the C16 / Plus/4 FPGA core recently. Just as OP's been pleasantly surprised by the ST, I was pleasantly surprised by the C16!
Forum: support.Hardware 04 March 2022, 13:50
Replies: 35
Views: 1,670
Posted By robinsonb5
You probably have Kickstart 2.05 revision 37.299...

You probably have Kickstart 2.05 revision 37.299 which doesn't support the internal IDE hard drive interface.

(WinUAE uses its own built-in uaescsi.device by default, unless you specifically set...
Forum: support.Hardware 01 March 2022, 14:04
Replies: 35
Views: 1,670
Posted By robinsonb5
Minimig was the OG, and MiST was originally...

Minimig was the OG, and MiST was originally designed as an updated Minimig-like board to be the platform for an Atari ST core - hence the name: Mini Amiga -> Minimig, Mini ST -> MiST.

Mistica is...
Forum: support.Hardware 24 February 2022, 23:40
Replies: 18
Views: 1,240
Posted By robinsonb5
It turns out that I do still have both the boards...

It turns out that I do still have both the boards and the software to program them, so I've just programmed three boards. (I still have a few more unopened.)

I should mention that while the...
Forum: Nostalgia & memories 24 February 2022, 10:45
Replies: 826
Views: 97,021
Posted By robinsonb5
It can actually be much simpler than that - at...

It can actually be much simpler than that - at least for scaling up (scaling down is trickier, but also arguably less useful)

Internally almost everything is already built in terms of shift...
Forum: support.Hardware 24 February 2022, 09:44
Replies: 18
Views: 1,240
Posted By robinsonb5
I think I still have a few of these boards if...

I think I still have a few of these boards if anyone's desperate to get hold of one. I'm not sure if I still have the (awful, Windows-only) PSoC Creator software though - you need a very specific...
Forum: support.Hardware 23 February 2022, 14:40
Replies: 35
Views: 1,670
Posted By robinsonb5
Not currently. In theory it would be possible to...

Not currently. In theory it would be possible to create a new interface and driver for faster SD card / HDF access - but it's a lot of work for a fairly small gain.


Memory timing isn't perfect...
Forum: support.Hardware 16 January 2022, 17:35
Replies: 43
Views: 6,409
Posted By robinsonb5
Oh that's very sad news - I'm so sorry to read...

Oh that's very sad news - I'm so sorry to read this. But thanks for sharing the news nonetheless.

RIP boing4000.
Forum: Hardware mods 27 November 2021, 13:49
Replies: 520
Views: 121,895
Posted By robinsonb5
Has anyone done any benchmarks on this WF68K30L? ...

Has anyone done any benchmarks on this WF68K30L?
It seems to have about 2.5 times the footprint of TG68 - partly because the register file is implemented as logic rather than memory blocks (because...
Forum: Amiga scene 21 November 2021, 15:31
Replies: 10
Views: 1,666
Posted By robinsonb5
The download limit of 10 is negotiable - but...

The download limit of 10 is negotiable - but there's also a time limit. You only get 1 year's worth of free updates, after which you're expected to pay again.
Forum: Nostalgia & memories 04 November 2021, 21:16
Replies: 826
Views: 97,021
Posted By robinsonb5
If I had to guess, I'd say they didn't have the...

If I had to guess, I'd say they didn't have the transistor budget in Denise for another 32 12-bit colour registers, and the requisite multiplexing or extra address decoding to expose them to the CPU....
Forum: Amiga scene 12 October 2021, 17:32
Replies: 39
Views: 3,969
Posted By robinsonb5
Interphase is pretty cool.

Interphase is pretty cool.
Forum: New to Emulation or Amiga scene 05 October 2021, 13:44
Replies: 4
Views: 2,306
Posted By robinsonb5
Do you know which version of the core you're...

Do you know which version of the core you're using, and whether you have the ARM controller upgrade? (Do you have a socketed chip near the SD card, or a small L-shaped daughter board?)

I think...
Forum: Hardware mods 17 June 2021, 11:45
Replies: 196
Views: 38,238
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: 38,238
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: 38,238
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: 5,799
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: 9,000
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: 61
Views: 15,588
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: 9,000
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: 494
Views: 58,549
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: 494
Views: 58,549
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: 2,068
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: 2,447
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: 2,068
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: 1,886
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: 2,595
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: 67
Views: 19,329
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: 2,595
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: 67
Views: 19,329
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: 2,595
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: 2,595
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: 2,595
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: 2,595
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: 2,595
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...
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