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Forum: Coders. Asm / Hardware 07 September 2020, 01:00
Replies: 9
Views: 562
Posted By DanScott
Is there any other activity (blitter, bitplane...

Is there any other activity (blitter, bitplane DMA etc..) that is restricting the CPU cycles?
Forum: Coders. Asm / Hardware 29 August 2020, 15:03
Replies: 219
Views: 29,495
Posted By DanScott
and yet again a thread goes off topic....

and yet again a thread goes off topic....
Forum: Retrogaming General Discussion 29 August 2020, 12:01
Replies: 177
Views: 8,608
Posted By DanScott
Yep, even in 16 colours, the chance of a steady...

Yep, even in 16 colours, the chance of a steady 50fps is pretty low... might as well go for a rock solid 25fps in 32 colours
Forum: Retrogaming General Discussion 27 August 2020, 23:14
Replies: 177
Views: 8,608
Posted By DanScott
To be honest, Puzzle Bobble doesn't look too bad...

To be honest, Puzzle Bobble doesn't look too bad in just 16 colours

https://i.ibb.co/TMgY9tQ/puzzlebobble.png
Forum: Nostalgia & memories 26 August 2020, 18:01
Replies: 48
Views: 2,609
Posted By DanScott
1985.. The Micro Show or Tomorrows World on BBC...

1985.. The Micro Show or Tomorrows World on BBC TV... they were showing off the "capabilities" of the A1000, the next big thing in personal computers.

A few weeks later, there was one sitting...
Forum: Retrogaming General Discussion 23 August 2020, 23:26
Replies: 177
Views: 8,608
Posted By DanScott
Nope... just do it at 25fps, and match the...

Nope... just do it at 25fps, and match the original movement/design 100% :D

In my experience, there are a large % of people that can't distinguish between 25fps and 50fps anyway... 25fps is...
Forum: Retrogaming General Discussion 23 August 2020, 22:17
Replies: 177
Views: 8,608
Posted By DanScott
My opinion.... Puzzle bobble is not a game...

My opinion....

Puzzle bobble is not a game that requires quick reflexes combined with a full frame-rate update to enable perfect gameplay... with that in mind, 25fps would be perfectly ample to...
Forum: Coders. General 23 August 2020, 12:45
Replies: 14
Views: 878
Posted By DanScott
Original poster wrote: "alternates between...

Original poster wrote:

"alternates between using 4 and 5 bitplanes every other rendered frame (not video frame.)"

So i assume he means that the 4/5 bitplane switch does not happen at 50hz
Forum: Coders. General 23 August 2020, 11:57
Replies: 14
Views: 878
Posted By DanScott
But the frame rate is so low, that the blinking...

But the frame rate is so low, that the blinking would be like 4 or 5 times a second maximum... that would look awful.

I am wondering if he has a double buffered copperlist, and for some reason...
Forum: Coders. Asm / Hardware 19 August 2020, 01:36
Replies: 5
Views: 622
Posted By DanScott
With 4 (or less) bitplanes enabled, you can only...

With 4 (or less) bitplanes enabled, you can only write to one hardware register every 8 low-res pixels

The trouble is, for what I interpret as what you want to achive, the colour changes will...
Forum: Coders. Asm / Hardware 15 August 2020, 23:45
Replies: 80
Views: 5,314
Posted By DanScott
The classic "bob record" demos on A500 (From...

The classic "bob record" demos on A500 (From around 1989/1990) used copper blitting techniques to achieve the best results
Forum: Coders. General 15 August 2020, 11:39
Replies: 27
Views: 1,603
Posted By DanScott
Looks like a variation on an atan tunnel without...

Looks like a variation on an atan tunnel without perspective
Forum: Coders. General 13 August 2020, 19:25
Replies: 27
Views: 1,603
Posted By DanScott
Essentially, in it's simplest form, yes... so you...

Essentially, in it's simplest form, yes... so you can easily do 8x1 pixel size in 12bit RGB...

For example in my Colombia 64k intro, the tunnels are using a method that gives a perceived 4x4 pixel...
Forum: Amiga scene 13 August 2020, 01:32
Replies: 685
Views: 74,619
Posted By DanScott
Oh these badly "stepping" lines on the title...

Oh these badly "stepping" lines on the title screen really funk with my OCD!!!!
Forum: Coders. General 11 August 2020, 19:52
Replies: 11
Views: 840
Posted By DanScott
other DMA activity will affect the timings too. ...

other DMA activity will affect the timings too.

How were these "scanlines" calculated ? Was bitplane DMA active at any point down the screen etc...
Forum: Coders. Asm / Hardware 09 August 2020, 22:42
Replies: 80
Views: 5,314
Posted By DanScott
That's what it looks like to me. Is a PAL wait...

That's what it looks like to me. Is a PAL wait $ffdf,$fffe (or similar) required ?
Forum: Coders. Asm / Hardware 08 August 2020, 20:03
Replies: 80
Views: 5,314
Posted By DanScott
I would say that when making a conversion from...

I would say that when making a conversion from coin-op, you want to replicate it as closely as possible
Forum: Retrogaming General Discussion 06 August 2020, 00:05
Replies: 63
Views: 3,326
Posted By DanScott
Yeah, deffo, sales after 1993 definitey tailed...

Yeah, deffo, sales after 1993 definitey tailed off to next to nothing
Forum: Retrogaming General Discussion 05 August 2020, 22:39
Replies: 63
Views: 3,326
Posted By DanScott
I am not 100% sure, but I think some of the more...

I am not 100% sure, but I think some of the more successful Core Design games sold between 20K-30K copies.. they must have done to be honest, to cover the salaries at least :D
Forum: Coders. Asm / Hardware 03 August 2020, 19:43
Replies: 80
Views: 5,314
Posted By DanScott
I had hoped that would be clear :D:D Yes,...

I had hoped that would be clear :D:D

Yes, CPU will get every cycle it deserves without wasting cycles sat inside a BlitWait loop... and of course the copper blitter wait is also quite efficient ;)
Forum: Coders. Asm / Hardware 02 August 2020, 19:30
Replies: 80
Views: 5,314
Posted By DanScott
CPU not having to wait for blitter.. all blitting...

CPU not having to wait for blitter.. all blitting taken care of by copper, and CPU totally free to update game logic, and build all render info for the next frame.
Forum: Coders. General 26 July 2020, 21:03
Replies: 4
Views: 615
Posted By DanScott
#$FFFFFF8E is not -$8E ;) it's -$72

#$FFFFFF8E is not -$8E ;) it's -$72
Forum: Coders. Asm / Hardware 23 July 2020, 22:00
Replies: 7
Views: 1,141
Posted By DanScott
https://www.cubic.org/docs/backcull.htm

https://www.cubic.org/docs/backcull.htm
Forum: Coders. General 22 July 2020, 19:52
Replies: 17
Views: 1,825
Posted By DanScott
I seem to remember maybe Richard Aplin wrote code...

I seem to remember maybe Richard Aplin wrote code on one Amiga, and then sent it to another Amiga to run... but I might be wrong (hazy memories)
Forum: Coders. Blitz Basic 19 July 2020, 18:30
Replies: 7
Views: 702
Posted By DanScott
Border Blank won't work on OCS Amigas If you...

Border Blank won't work on OCS Amigas

If you want to retain 100% compatability for earler Amiga models, then you should not use colour 0, but another colour.

EDIT: just saw you are targetting...
Forum: Coders. Asm / Hardware 16 July 2020, 00:04
Replies: 225
Views: 23,493
Posted By DanScott
Apart from the usual "clears" and "fills", you'd...

Apart from the usual "clears" and "fills", you'd be suprised probably at how little the blitter really gets used (especially in my recent demos).. quite often to do things that are not exactly...
Forum: Coders. Asm / Hardware 09 July 2020, 10:05
Replies: 225
Views: 23,493
Posted By DanScott
I would imagine that the background layer and...

I would imagine that the background layer and foreground layer are drawn in 1 pass, combining the data (masking foreground against background) and then written to the screen buffer
Forum: Retrogaming General Discussion 08 July 2020, 14:54
Replies: 28
Views: 1,906
Posted By DanScott
Would it surprise many people, that the majority...

Would it surprise many people, that the majority of game source code is now lost in the midsts of time ?

I know for a fact that all the Core Design source code is long gone... perhaps a few bits...
Forum: Coders. Asm / Hardware 07 July 2020, 14:14
Replies: 225
Views: 23,493
Posted By DanScott
I would be interested to know what they used the...

I would be interested to know what they used the blitter for, as from what I can tell it runs identically to the ST version (perhaps the ST version slows down more, but the base speed appears to be...
Forum: Coders. Asm / Hardware 06 July 2020, 11:19
Replies: 225
Views: 23,493
Posted By DanScott
what about all the cannon attachments ?

what about all the cannon attachments ?
Forum: Coders. Asm / Hardware 03 June 2020, 10:21
Replies: 13
Views: 945
Posted By DanScott
using simple quick maths..imagine X velocity is a...

using simple quick maths..imagine X velocity is a long (16:16 fixed point)

move.l Destination_XVel,d0
move.l Current_XVel,d1
sub.l d1,d0
asr.l #5,d0
add.l d0,d1
move.l d1,Current_XVel

This...
Forum: Coders. Asm / Hardware 02 June 2020, 12:37
Replies: 13
Views: 945
Posted By DanScott
Ok, the way I did it in BC Racers (as far as I...

Ok, the way I did it in BC Racers (as far as I recall), was to have a destination velocity (x&y), and interpolate current velocity towards the destination velocity.

This means at slow velocities,...
Forum: Coders. Asm / Hardware 02 June 2020, 12:30
Replies: 13
Views: 945
Posted By DanScott
you mean the inertia that causes the car to skid...

you mean the inertia that causes the car to skid sideways when turning at a fast velocity ?
Forum: Coders. Asm / Hardware 28 May 2020, 19:02
Replies: 20
Views: 1,403
Posted By DanScott
You need to ensure that you set the sprite...

You need to ensure that you set the sprite positions extremely early with the CPU
Forum: Coders. Asm / Hardware 28 May 2020, 19:01
Replies: 20
Views: 1,403
Posted By DanScott
I guess the DMA has already read the top sprites...

I guess the DMA has already read the top sprites position before you set it... and then subsequently you are setting the second sprites position before it gets read by the DMA
Forum: Coders. Asm / Hardware 19 May 2020, 15:16
Replies: 13
Views: 950
Posted By DanScott
Saves 2 bytes

Saves 2 bytes
Forum: Retrogaming General Discussion 19 May 2020, 02:26
Replies: 326
Views: 26,324
Posted By DanScott
https://www.youtube.com/watch?v=Ej_0f41dadQ

https://www.youtube.com/watch?v=Ej_0f41dadQ
Forum: Retrogaming General Discussion 19 May 2020, 02:25
Replies: 326
Views: 26,324
Posted By DanScott
No.. wrong, because draw to display is the same...

No.. wrong, because draw to display is the same latency... you just clear the 3rd buffer before it comes back round to be rendered to again ;)
Forum: Nostalgia & memories 18 May 2020, 18:18
Replies: 90
Views: 17,470
Posted By DanScott
I remember that from the early days.. but I don't...

I remember that from the early days.. but I don't think it was rendered...
Forum: Amiga scene 14 May 2020, 19:33
Replies: 35
Views: 4,178
Posted By DanScott
section modpatterns,data ...

section modpatterns,data
ModuleTrk: incbin "dh0/assets/2020vision/modules/lemonfuturefunk.mod.trk"

ifeq GENERATE_SAMPLES
section modulesamples,data_c...
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