Forum: Coders. Asm / Hardware
11 April 2024, 04:23
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Replies: 91
Views: 5,644
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Forum: Coders. Asm / Hardware
09 April 2024, 20:28
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Replies: 9
Views: 807
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Forum: Coders. Asm / Hardware
08 April 2024, 20:46
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Replies: 91
Views: 5,644
Have you tried reordering instructions to...
Have you tried reordering instructions to optimize bus usage?
Mulu.l might be a win if you can initiate a cache line fill or chip ram write just before the mulu.l.
It would require a certain...
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Forum: Coders. Asm / Hardware
02 April 2024, 00:43
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Replies: 5
Views: 610
The main thing is to understand is the division...
The main thing is to understand is the division of responsibility between Agnus and Paula. Paula's logic will tell Agnus that it needs a new sample from the stored waveform or that it has reached the...
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Forum: Coders. Asm / Hardware
25 March 2024, 18:53
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Replies: 14
Views: 927
You make good points.
One thing, though. As...
You make good points.
One thing, though. As long as movem.l uses some addressing mode other than predecrement mode memory is written to in-oder. This works for updating a sprite completely since a...
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Forum: Coders. Asm / Hardware
25 March 2024, 15:41
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Replies: 14
Views: 927
The recent thread by !ZAJC!...
The recent thread by !ZAJC! https://eab.abime.net/showthread.php?t=117203 suggests that in theory MOVEM.L to sprite registers with race-the-beam style/cycle exact programming is possible and would...
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Forum: Coders. Asm / Hardware
25 March 2024, 02:39
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Replies: 13
Views: 911
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Forum: Coders. Asm / Hardware
24 March 2024, 23:35
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Replies: 14
Views: 927
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Forum: Coders. Asm / Hardware
24 March 2024, 17:01
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Replies: 13
Views: 911
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Forum: Coders. Asm / Hardware
21 March 2024, 01:59
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Replies: 13
Views: 1,045
Great work! Love it.
I wonder, how badly are...
Great work! Love it.
I wonder, how badly are MULs and DIVs affected?
I have this fantasy that one day someone will write 3d code that includes a math scheduler that tries to time the use of...
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Forum: Coders. Asm / Hardware
19 March 2024, 02:10
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Replies: 13
Views: 1,045
The table here might be of interest to you:...
The table here might be of interest to you: https://gist.githubusercontent.com/cbmeeks/e759c7061d61ec4ac354a7df44a4a8f1/raw/c8f250348f24fdf53a1b5e71b7734ecefef9b3d2/Yacht.txt
Every 'n' or 'p' or...
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Forum: Coders. Asm / Hardware
17 March 2024, 03:49
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Replies: 26
Views: 1,471
Oh, c'mon. You know you want to. :)
I have...
Oh, c'mon. You know you want to. :)
I have been wondering what a flat creen might do if the VHPOS is walked back 16 pixels a few times per line. HSYNC frequency would be reduced but a few...
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Forum: Coders. Asm / Hardware
15 March 2024, 19:34
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Replies: 12
Views: 669
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Forum: Coders. Asm / Hardware
12 March 2024, 23:04
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Replies: 12
Views: 669
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Forum: Coders. Asm / Hardware
01 March 2024, 16:56
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Replies: 7
Views: 624
I'd be interested in seeing how DMA affects...
I'd be interested in seeing how DMA affects various techniques. With lots of DMA the goal might be to minimize the ratio of instruction fetch to actual memory read/writes instead of raw speed,...
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Forum: Coders. Asm / Hardware
29 February 2024, 18:44
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Replies: 79
Views: 13,502
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Forum: Coders. Asm / Hardware
29 February 2024, 00:19
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Replies: 6
Views: 509
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Forum: Coders. Asm / Hardware
22 February 2024, 08:49
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Replies: 21
Views: 1,249
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Forum: Coders. Asm / Hardware
21 February 2024, 18:13
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Replies: 338
Views: 387,945
Well I wouldn't necessarily expect completely...
Well I wouldn't necessarily expect completely arbitrary positions to be workable. I was thinking in terms of a third repeating background.-- 15 color attached sprites side by side behind a PF. No...
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Forum: Coders. Asm / Hardware
21 February 2024, 00:56
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Replies: 338
Views: 387,945
So if a bunch of sprites are displayed on the...
So if a bunch of sprites are displayed on the left side of the screen, writing to VHPOSW can get denise to redisplay them again provided a low enough HPOS is written? And Agnus continues to fetch BP...
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Forum: Coders. Asm / Hardware
16 February 2024, 18:15
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Replies: 79
Views: 13,502
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Forum: Coders. Asm / Hardware
26 April 2022, 14:50
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Replies: 83
Views: 13,626
Page mode certainly did exist at the time. The...
Page mode certainly did exist at the time. The Acorn Electron (1983) used it to cleverly reduce the number of dram chips from eight to four. It actually had a four bit bus. Page mode was exploited to...
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Forum: Coders. Asm / Hardware
23 April 2022, 03:11
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Replies: 83
Views: 13,626
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Forum: Coders. Asm / Hardware
19 April 2022, 13:13
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Replies: 19
Views: 2,994
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Forum: Coders. Asm / Hardware
16 April 2022, 03:00
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Replies: 19
Views: 2,994
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Forum: Coders. Asm / Hardware
15 April 2022, 00:03
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Replies: 19
Views: 2,994
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Forum: Coders. Asm / Hardware
14 April 2022, 07:46
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Replies: 19
Views: 2,994
I would do a loop until you get close to your...
I would do a loop until you get close to your position, then do a jmp (0, d0, a0) into a block of nops where a0 contains the address of the start of the nop list and d0 has hpos left shifted by one...
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Forum: Coders. Asm / Hardware
12 April 2022, 04:04
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Replies: 31
Views: 3,650
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Forum: Coders. Asm / Hardware
05 April 2022, 23:18
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Replies: 41
Views: 5,406
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Forum: Coders. Asm / Hardware
02 April 2022, 02:07
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Replies: 41
Views: 5,406
Your interrupt handler looks like it checks for...
Your interrupt handler looks like it checks for the possibility of another interrupting event. Are there other events that cause an int3 like the blitter? If other int3s are possible, what happens to...
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Forum: Coders. Asm / Hardware
01 April 2022, 19:08
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Replies: 41
Views: 5,406
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Forum: Coders. Asm / Hardware
08 March 2022, 00:34
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Replies: 8
Views: 1,421
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Forum: Coders. Asm / Hardware
07 March 2022, 01:12
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Replies: 22
Views: 3,403
The bitplane organization in the ST has some...
The bitplane organization in the ST has some advantages when using the CPU for 16 color graphics. A pair of MOVE.Ls will update 16 pixels while on the Amiga four MOVE.Ms are required, one for each...
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Forum: Coders. General
26 February 2022, 02:24
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Replies: 20
Views: 5,138
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Forum: Coders. General
25 February 2022, 16:34
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Replies: 20
Views: 5,138
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Forum: Coders. General
25 February 2022, 15:13
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Replies: 20
Views: 5,138
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Forum: Coders. Asm / Hardware
24 February 2022, 14:30
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Replies: 32
Views: 3,958
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Forum: Coders. Asm / Hardware
24 February 2022, 02:16
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Replies: 32
Views: 3,958
Pretty much. Of course that also determines how...
Pretty much. Of course that also determines how many words will be read from the source whether the source in terms of actually used bits is really that wide or not, hence the need to.pad the source....
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Forum: Coders. Asm / Hardware
23 February 2022, 19:27
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Replies: 32
Views: 3,958
The width is determined by the needs of the...
The width is determined by the needs of the destination and not by the source.
Even a two-pixel-wide source will need an extra word on each line if there is any possibility that the blitter will...
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Forum: Coders. Asm / Hardware
15 February 2022, 06:17
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Replies: 338
Views: 387,945
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