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Forum: Retrogaming General Discussion 23 July 2021, 01:12
Replies: 108
Views: 10,630
Posted By DanScott
We tried to do this on Chuck Rock 2, but the...

We tried to do this on Chuck Rock 2, but the Amiga just wasn't quite up to it at a good frame rate. The Megadrive version uses this technique for the "back of a dinosaur" and "tree into lava" levels.
Forum: Coders. Asm / Hardware 26 June 2021, 12:38
Replies: 21
Views: 1,488
Posted By DanScott
You can effectively do that using dual playfield...

You can effectively do that using dual playfield (one playfield for background and 2nd playfield for moving bobs)... That way you probably *could* just clear the whole screen (using a combination of...
Forum: Nostalgia & memories 20 June 2021, 23:46
Replies: 66
Views: 9,466
Posted By DanScott
Probably sampled from the original mix, as the...

Probably sampled from the original mix, as the track starts with just the vocal bit more isolated

https://www.youtube.com/watch?v=2Gz1NSrPcpk
Forum: Retrogaming General Discussion 11 June 2021, 00:17
Replies: 6
Views: 671
Posted By DanScott
Don't think anyone involved with the demo...

Don't think anyone involved with the demo "re-released" it like that. Probably somone thought it was a good idea for some reason or other.
Forum: Coders. Asm / Hardware 24 May 2021, 13:53
Replies: 32
Views: 3,381
Posted By DanScott
I think there was some previous to...

I think there was some previous to Announce/Lemon.

I remember when it was released, and thinking that it was a nice variation on another one that I'd seen. Will have to have a dig around and see...
Forum: Retrogaming General Discussion 22 May 2021, 23:01
Replies: 743
Views: 61,615
Posted By DanScott
Nobody should be under any impression that ANY...

Nobody should be under any impression that ANY port of a (1986 and upwards) coin op would magically happen easily, with graphics just fed through some simple conversion tool.

It just wouldn't be...
Forum: Retrogaming General Discussion 21 May 2021, 01:25
Replies: 743
Views: 61,615
Posted By DanScott
Karnov might be a good one... perhaps Tiger Road...

Karnov might be a good one... perhaps Tiger Road (that got a piss poor conversion from US gold)

Wardner too is a great game, that never made it to Amiga


And I'll disagree that A500 can't do a...
Forum: Retrogaming General Discussion 19 May 2021, 20:09
Replies: 743
Views: 61,615
Posted By DanScott
would also seriously shaft the gameplay.. but...

would also seriously shaft the gameplay.. but ho-hum :D
Forum: Retrogaming General Discussion 19 May 2021, 14:43
Replies: 743
Views: 61,615
Posted By DanScott
Don't look at the hardware specs... look at the...

Don't look at the hardware specs... look at the actual game ;)
Forum: Retrogaming General Discussion 19 May 2021, 14:22
Replies: 743
Views: 61,615
Posted By DanScott
On a side note, and not trying to derail the...

On a side note, and not trying to derail the mcgeezer/DamianD beef...

Trojan should be pretty doable on A500 :)
Forum: Coders. Asm / Hardware 19 May 2021, 13:03
Replies: 32
Views: 3,381
Posted By DanScott
For efficiency, most rotozoomers will...

For efficiency, most rotozoomers will precalculate the code for generating a line worth of copper data using unrolled moves:

eg.

move.w XX(a0),YY(a1)
move.w XX(a0),YY(a1)
move.w XX(a0),YY(a1)...
Forum: Coders. Asm / Hardware 19 May 2021, 00:44
Replies: 4
Views: 805
Posted By DanScott
Yes, you can use a combination of SKIP's and...

Yes, you can use a combination of SKIP's and copper jumps to "repeat" a horizontal line on the next line.

Have a look at Roondar's post today about copper screen, he uses that technique (with some...
Forum: Coders. Asm / Hardware 15 May 2021, 12:11
Replies: 19
Views: 1,451
Posted By DanScott
Apart from the ones floating around in 1993 that...

Apart from the ones floating around in 1993 that came from Commodore
Forum: Coders. Asm / Hardware 13 May 2021, 15:41
Replies: 4
Views: 835
Posted By DanScott
You need to flip the byte order too for each...

You need to flip the byte order too for each line, as well as the bits within each byte
Forum: Coders. General 07 May 2021, 12:59
Replies: 13
Views: 1,327
Posted By DanScott
I use Arcane IFFMaster too occasionally ;)

I use Arcane IFFMaster too occasionally ;)
Forum: Coders. General 07 May 2021, 12:47
Replies: 13
Views: 1,327
Posted By DanScott
Ha! I still use TFA Converter for pretty much all...

Ha! I still use TFA Converter for pretty much all my stuff :) If it ain't broke.. etc...
Forum: Coders. General 07 May 2021, 11:27
Replies: 13
Views: 1,327
Posted By DanScott
Seems ok with V1.0 of TFAConverter (not sure if...

Seems ok with V1.0 of TFAConverter (not sure if this came before or after IFFConverter)

https://i.imgur.com/AyyFL65.png
Forum: Coders. Asm / Hardware 06 May 2021, 13:41
Replies: 9
Views: 1,184
Posted By DanScott
FMODE (fetch mode register) controls how much...

FMODE (fetch mode register) controls how much data is read by the DMA for bitplanes (and for sprites), and is an AGA only register.

When fetchmode for bitplanes is x2 or x4 (only available on...
Forum: Coders. General 06 May 2021, 11:55
Replies: 13
Views: 1,327
Posted By DanScott
what are the dimensions of the PNG? When you...

what are the dimensions of the PNG? When you convert the PNG to an IFF, is the IFF correct?

Perhaps increase the dimensions of the source image?
Forum: Coders. Asm / Hardware 05 May 2021, 22:23
Replies: 92
Views: 5,714
Posted By DanScott
I think that's the same as the one I had... don't...

I think that's the same as the one I had... don't remember exactly though.. I can't even remember what I had for breakfast most evenings !
Forum: Coders. Asm / Hardware 05 May 2021, 18:00
Replies: 3
Views: 623
Posted By DanScott
I wouldn't actually use a packer to pack it, as...

I wouldn't actually use a packer to pack it, as you just can't guarantee the entropy of that kind of data.

It's probably worth just trying to store the data as a bit stream in as few bits as...
Forum: Coders. Asm / Hardware 05 May 2021, 15:25
Replies: 14
Views: 1,066
Posted By DanScott
and just to add more (complexity)... movea.w...

and just to add more (complexity)...

movea.w #value,a0 will sign extend to a long..

so after:

movea.w #$8000,a0 = a0.l will contain$ffff8000
Forum: Coders. Asm / Hardware 05 May 2021, 13:43
Replies: 14
Views: 1,066
Posted By DanScott
LEA calculates an effective address... for...

LEA calculates an effective address... for example.

lea 2(a1,d4.w),a0

has a much different result than

move.l 2(a1,d4.w),a0


but in terms of operation, the 2 examples you provided do...
Forum: Coders. Asm / Hardware 05 May 2021, 13:13
Replies: 92
Views: 5,714
Posted By DanScott
It was 1993, and they were printed. Lost them a...

It was 1993, and they were printed. Lost them a long time ago
Forum: Coders. Asm / Hardware 05 May 2021, 01:05
Replies: 9
Views: 1,184
Posted By DanScott
Perhaps on the A4000 config, your code is running...

Perhaps on the A4000 config, your code is running with data fetch mode (FMODE register) already set to 32bit or 64bit bitplane fetch ?

Maybe try clearing FMODE register where you also set up your...
Forum: Coders. Asm / Hardware 04 May 2021, 23:34
Replies: 9
Views: 1,184
Posted By DanScott
As a quick fix, try waiting for line 16, then...

As a quick fix, try waiting for line 16, then again for line 17 before proceeding
Forum: Coders. Asm / Hardware 04 May 2021, 19:17
Replies: 92
Views: 5,714
Posted By DanScott
Yeah, mine were typeset properly. Can't remember...

Yeah, mine were typeset properly. Can't remember exactly when I got them, but it would have been around mid 1993 I think.

I remember at the time EVERYONE was hassling me for a copy :D
Forum: Coders. Asm / Hardware 04 May 2021, 18:07
Replies: 92
Views: 5,714
Posted By DanScott
I got the full AGA docs off Commodore in 1993 (I...

I got the full AGA docs off Commodore in 1993 (I was one of the first)
Forum: Coders. Asm / Hardware 30 April 2021, 10:17
Replies: 12
Views: 1,166
Posted By DanScott
You just need to do this: ; Test...

You just need to do this:


; Test if these bits 0 and 1 are set
andi.l #(1<<0)|(1<<1),d0
beq .theseBitsAreNotSet


no need for a "cmp" or "sub", as the "and" will set...
Forum: Amiga scene 29 April 2021, 18:04
Replies: 903
Views: 166,212
Posted By DanScott
I'd imagine if there was ever some kind of issue...

I'd imagine if there was ever some kind of issue with Blitter overheating, we would have heard about it by around early 1986 probably ;)
Forum: Coders. Asm / Hardware 28 April 2021, 19:01
Replies: 8
Views: 1,126
Posted By DanScott
I've never disassembled this to look, but I...

I've never disassembled this to look, but I always had the feeling that he converted images into a format where he could just draw lines with the blitter and fill in 1 pass.
Forum: Coders. Asm / Hardware 26 April 2021, 12:29
Replies: 2
Views: 516
Posted By DanScott
Ah cool.. handy to know, and in this case, the...

Ah cool.. handy to know, and in this case, the low word will remain zero which is the desired outcome of an overflow anyway, so no need to handle overflow case :)
Forum: Coders. Asm / Hardware 26 April 2021, 10:36
Replies: 2
Views: 516
Posted By DanScott
DIVS overflow question...

If I have something like:

move.l #$00800000,d0
divs d1,d0



if for example, d1 was 3, then an overflow would be detected (as the result does not fit in a word size), and the V flag is set.
...
Forum: Coders. Asm / Hardware 25 April 2021, 11:36
Replies: 21
Views: 1,443
Posted By DanScott
You're right, it's sample mixing (up to 4 samples...

You're right, it's sample mixing (up to 4 samples mixed down to one), but it's a conversion of an existing sample mixing system written in C, and results need to be consistent with the output of the...
Forum: Coders. Asm / Hardware 25 April 2021, 00:49
Replies: 21
Views: 1,443
Posted By DanScott
but if d0.w is (for example) -450, then it's not...

but if d0.w is (for example) -450, then it's not going to get a value from the LUT

I guess LUT pointer needs to point to the middle :)
Forum: Coders. Asm / Hardware 25 April 2021, 00:29
Replies: 21
Views: 1,443
Posted By DanScott
basically, I have up to 4 byte values (each can...

basically, I have up to 4 byte values (each can be in the full range -128 to +127) that I need to add together, and then clamp the result to -128 to +127.

Ross, not sure if what you are suggesting...
Forum: Coders. Asm / Hardware 24 April 2021, 23:33
Replies: 21
Views: 1,443
Posted By DanScott
Thanks!!! That's awesome, and an ext.w d0 after...

Thanks!!! That's awesome, and an ext.w d0 after the eori should do the trick :)

That extend the byte of itself and compare to see if it's within the range is a cool trick, would never have though...
Forum: Coders. Asm / Hardware 24 April 2021, 17:10
Replies: 21
Views: 1,443
Posted By DanScott
Clamping a word to signed byte range

After some great contributions to my "clamped word result of an add" question.... does anyone know a good/quicker way to clamp a word to a signed byte range?

ie.. quicker than this:

...
Forum: Coders. Asm / Hardware 23 April 2021, 17:49
Replies: 25
Views: 1,647
Posted By DanScott
I don't think that's necessary with LSP... but I...

I don't think that's necessary with LSP... but I guess it could work for a player that needs to set AUDxLC too. Removes a lot of overhead cycles "wasted" by interrupt handlers and CPU internal...
Forum: Coders. Asm / Hardware 23 April 2021, 17:24
Replies: 25
Views: 1,647
Posted By DanScott
I mean that it doesn't use a copper interrupt at...

I mean that it doesn't use a copper interrupt at all.

The music player is called at the top of the vblank interrupt, and then in the copperlist, there's a copper wait for (for example) line 15...
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