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Forum: Amiga scene 18 July 2019, 14:59
Replies: 776
Views: 36,120
Posted By coder76
Well, yes I meant several layers with different...

Well, yes I meant several layers with different speeds. These colorreduced c2p's are again used to save memory bandwidth. If you only have a chunky hardware display, but not improved chip ram speed,...
Forum: Amiga scene 18 July 2019, 14:34
Replies: 776
Views: 36,120
Posted By coder76
There are perhaps some advantages still with...

There are perhaps some advantages still with planar graphics, like being able to have several independent scrolling layers; especially useful for vertical scrolling, when you don't need HW support...
Forum: Amiga scene 11 July 2019, 21:48
Replies: 776
Views: 36,120
Posted By coder76
Some things about performance here: A...

Some things about performance here:

A 68030/50 MHz accelerator with fastram on an A1200 should always be clearly faster than any standard 386SX/386DX machines. As 386DX had a max clock frequency...
Forum: Retrogaming General Discussion 19 June 2019, 13:50
Replies: 9
Views: 812
Posted By coder76
It would be possible to separate scrolling from...

It would be possible to separate scrolling from blitting bobs in a way that would allow 50 FPS for scrolling, but slower FPS for bobs. But this is trickier to implement correctly, as you would need...
Forum: Coders. Asm / Hardware 27 March 2019, 12:07
Replies: 66
Views: 2,985
Posted By coder76
AGA does have colorbank swap option via bplcon4,...

AGA does have colorbank swap option via bplcon4, so you can swap colorbanks in sizes of 2^n with a single instruction in copperlist. That means you can preload 256 colors in color registers, and if...
Forum: Amiga scene 25 January 2019, 22:48
Replies: 338
Views: 22,217
Posted By coder76
Well, the relevancy is here that modern hardware...

Well, the relevancy is here that modern hardware is pretty ugly. One needs to focus on cutting down complexity, and not using too much existing solutions. Especially not having new hardware which...
Forum: Amiga scene 25 January 2019, 21:52
Replies: 338
Views: 22,217
Posted By coder76
There are a certain number of flaws in the...

There are a certain number of flaws in the Vampire design, which also the designers don't seem to care much about. The Vampire system should run easily without operating system services, like old...
Forum: Retrogaming General Discussion 08 January 2019, 22:41
Replies: 147
Views: 8,790
Posted By coder76
The biggest problem perhaps with C64-like synth...

The biggest problem perhaps with C64-like synth sounds is that certain instruments do not sound good, like drums and bass, which are better done with samples. Combining synth sounds and samples gives...
Forum: Retrogaming General Discussion 08 January 2019, 13:04
Replies: 147
Views: 8,790
Posted By coder76
While there were not many chiptunes made for...

While there were not many chiptunes made for Amiga, the quality of these can certainly be better than on Atari ST or c64. C64 sids actually sound boring in comparison to these.
...
Forum: Coders. Asm / Hardware 04 December 2018, 18:53
Replies: 7
Views: 841
Posted By coder76
Well, does the 3+3 bitplane dual playfield mode...

Well, does the 3+3 bitplane dual playfield mode work? If it does, then the 6th bitplane should also work.
Forum: News 27 November 2018, 14:47
Replies: 28
Views: 2,848
Posted By coder76
In some ways, a high-end 68030 + AGA hits the...

In some ways, a high-end 68030 + AGA hits the sweet spot in terms of CPU vs. chipset performance. With faster CPUs, the chipram becomes more of a bottleneck, but a 68060 is still needed for 3D games,...
Forum: Coders. Asm / Hardware 14 November 2018, 20:16
Replies: 1,000
Views: 42,466
Posted By coder76
It's not easy to compare instruction cycle count...

It's not easy to compare instruction cycle count between various architectures. If you look in MC68020 manual, there's 3 cases given for each instruction, best, cache and worst. Typically you would...
Forum: Retrogaming General Discussion 27 October 2018, 20:01
Replies: 152
Views: 10,250
Posted By coder76
I think AGA is still underrated in terms of...

I think AGA is still underrated in terms of performance vs. OCS. While AGA was not designed to run games like Doom and Quake, it turned out that these will run decently on an AGA machine with enough...
Forum: Retrogaming General Discussion 29 September 2018, 17:34
Replies: 152
Views: 10,250
Posted By coder76
Wolfenstein does run on high-end 286's, and also...

Wolfenstein does run on high-end 286's, and also on a 386SX. Doom requires better hardware, so a 386/40 MHz is probably a minimum, and it won' run fast on that. Doom runs on Amiga too, but requires a...
Forum: Coders. Asm / Hardware 25 September 2018, 16:54
Replies: 70
Views: 3,004
Posted By coder76
Yes, but we were talking about handling GCR...

Yes, but we were talking about handling GCR format with Amiga's native disk drives. This A1020 is some external disk drive which has its own drive mechanism, and probably is connected to Amiga via...
Forum: Coders. Asm / Hardware 25 September 2018, 09:26
Replies: 70
Views: 3,004
Posted By coder76
In Wikipedia there is an article about GCR format...

In Wikipedia there is an article about GCR format and some of its variations. Apple used three different encodings, of which the two first were pretty poor in terms of encoding efficiency. Then later...
Forum: Coders. Asm / Hardware 21 September 2018, 22:46
Replies: 70
Views: 3,004
Posted By coder76
I remember that I tried to implement GCR format...

I remember that I tried to implement GCR format reading and writing to floppy disk as described in Amiga Disk Drives Inside & Out, but it didn't work at all. Not sure where problem is, but got only...
Forum: News 19 September 2018, 14:16
Replies: 341
Views: 60,677
Posted By coder76
Has there been a fix to these guru meditation...

Has there been a fix to these guru meditation boxes and early bootup screen that you activate with both mouse buttons, that they also work with ~30 kHz displays? Now it looks to me under AmigaOS 3.1...
Forum: Amiga scene 29 August 2018, 11:11
Replies: 67
Views: 4,072
Posted By coder76
Old PC desktop models ranging from 286 to Pentium...

Old PC desktop models ranging from 286 to Pentium MMX and Pentium Pro aren't cheap either, they usually cost several hundred USD. Prices start to go down with Pentium II, which you can get for less...
Forum: Coders. Asm / Hardware 21 August 2018, 18:37
Replies: 1,000
Views: 42,466
Posted By coder76
Here's a list of x86 instruction clock cycles...

Here's a list of x86 instruction clock cycles from 8088-Pentium:
https://www.cs.dartmouth.edu/~mckeeman/cs48/mxcom/doc/x86.html

Compared to a 286, a 68000 seems slow. It's 5 clock cycles for a...
Forum: Coders. General 13 August 2018, 21:13
Replies: 62
Views: 15,209
Posted By coder76
Not necessarily. Stardust used this mirroring...

Not necessarily. Stardust used this mirroring technique in the tunnel sequences with dualplayfield, so the objects were in a different playfield. But then you're limited to 3+3 bitplanes, which may...
Forum: Coders. General 09 August 2018, 22:22
Replies: 133
Views: 14,799
Posted By coder76
It isnt clear from your writings how you fill...

It isnt clear from your writings how you fill your polygons, but you should fill only 1 bitplane per surface, so if you have a 4 bitplane screen, then you have only 4 colors available (0001, 0010,...
Forum: Nostalgia & memories 04 August 2018, 00:21
Replies: 106
Views: 14,732
Posted By coder76
Yes, but all is not lost here, after writing into...

Yes, but all is not lost here, after writing into chip ram, the 68030 can continue executing code in parallell in fast ram, provided no more memory accesses are done during these 28 cycles. This...
Forum: New to Emulation or Amiga scene 09 July 2018, 15:55
Replies: 45
Views: 3,986
Posted By coder76
Yes, you are right, I was thinking too much in...

Yes, you are right, I was thinking too much in terms of how amiga memory system works. The PC's have always had better bandwidth for their CPUs to their video memory than Amigas.
Forum: New to Emulation or Amiga scene 09 July 2018, 13:05
Replies: 45
Views: 3,986
Posted By coder76
It's not possible to run 640x480 with 256 colors...

It's not possible to run 640x480 with 256 colors and 60 Hz on a standard ISA bus. There were some special screenmodes available that could run with lower refresh rates and lower resolution with 256...
Forum: New to Emulation or Amiga scene 09 July 2018, 12:48
Replies: 45
Views: 3,986
Posted By coder76
The VGA standard was made for the ISA bus, which...

The VGA standard was made for the ISA bus, which was a standard back then on the PC's. However, the ISA bus has a too limited bandwidth to support more than 16 colors in 640x480. This is where AGA is...
Forum: Coders. General 07 July 2018, 18:45
Replies: 587
Views: 53,864
Posted By coder76
I think your calculations are not entirely...

I think your calculations are not entirely correct. 128 bytes for gfx and 32 for mask are clear, but you're saying total overhead is 928 bytes? It's too much. A 32 bit CPU wouldn't also write 16...
Forum: Coders. General 06 July 2018, 21:18
Replies: 587
Views: 53,864
Posted By coder76
This can't be true, initially I would have...

This can't be true, initially I would have estimated max number of sprites to be around 500. Then I found this documentation, which says that X68000 has 128 sprites, but the author found a way to...
Forum: Coders. General 06 July 2018, 17:35
Replies: 587
Views: 53,864
Posted By coder76
Well it seemed to me that AnimaInCorpore doubted...

Well it seemed to me that AnimaInCorpore doubted that it would be possible to make some more high-end bullet hell shooter on an A1200 like Cho Ren Sha. Yes, not possible on an unexpanded A1200, one...
Forum: Coders. General 06 July 2018, 16:22
Replies: 587
Views: 53,864
Posted By coder76
If one wants to have something more high-end,...

If one wants to have something more high-end, then one should use an accelerator board with an A1200, and draw most object graphics with the CPU, because the blitter is way too slow. I did some tests...
Forum: Coders. Asm / Hardware 11 March 2018, 16:59
Replies: 54
Views: 10,502
Posted By coder76
Could you be more specific? The tests on my...

Could you be more specific? The tests on my Blizzard IV board on an A1200 with a 68030/50 MHz and fast ram gives over 10 MB/sec with cpu + blitter performing straight copies into chip ram at same...
Forum: Coders. Asm / Hardware 11 March 2018, 12:19
Replies: 54
Views: 10,502
Posted By coder76
Yes ok, but I still think GameSmith doesn't offer...

Yes ok, but I still think GameSmith doesn't offer what I'm looking for. After reading some Atari Forums, I became interested in how one could implement software sprites on Amiga, and that means...
Forum: Coders. Asm / Hardware 10 March 2018, 22:10
Replies: 54
Views: 10,502
Posted By coder76
@Samurai Crow Thanks for the idea, but I'm used...

@Samurai Crow
Thanks for the idea, but I'm used to hack Amiga hardware directly with just asm and maybe C. Got some experience from past, so not starting from a clean table.

@PeterK
Yes, ok. It...
Forum: Coders. Asm / Hardware 10 March 2018, 19:07
Replies: 54
Views: 10,502
Posted By coder76
I don't know how FBlit works in detail, but of...

I don't know how FBlit works in detail, but of course you need to store your data in both fast and chip ram, if blitter and CPU operates on same objects. Mainly thought about fonts, icons and some...
Forum: Coders. Asm / Hardware 10 March 2018, 17:32
Replies: 54
Views: 10,502
Posted By coder76
Can Fblit use CPU and blitter at same time for...

Can Fblit use CPU and blitter at same time for same tasks? on AGA machines with fastram, there is certainly enough bandwidth for CPU and blitter to work in parallell into chip ram. With 32-bit memory...
Forum: Retrogaming General Discussion 09 March 2018, 12:15
Replies: 67
Views: 3,909
Posted By coder76
Yes, you need both a blitter and horizontal...

Yes, you need both a blitter and horizontal HW-scroll to compete with Amiga games. But even then Atari STe doesn't have some features that Amiga has, like hardware sprites, dual playfield, and more...
Forum: Retrogaming General Discussion 09 March 2018, 00:02
Replies: 67
Views: 3,909
Posted By coder76
Atari failed pretty badly with their hardware. At...

Atari failed pretty badly with their hardware. At first, they didn't want to use a blitter, because it was too expensive, and then when it became cheaper, they started installing it in later Atari...
Forum: Amiga scene 02 March 2018, 21:21
Replies: 63
Views: 3,042
Posted By coder76
It's called Sega Megafire, it has some added...

It's called Sega Megafire, it has some added functionality, like autofire for each button. So not the standard pad I believe. I think also that various Sega pads require different code to work, which...
Forum: Amiga scene 02 March 2018, 20:59
Replies: 63
Views: 3,042
Posted By coder76
I tested an old 3 button Megadrive controller...

I tested an old 3 button Megadrive controller (buttons A, B, C) with a few games on an A1200, and only Turrican 2 worked. ADoom for example didn't respond to button "C", but then when "B" (fire...
Forum: Coders. General 02 March 2018, 12:34
Replies: 15
Views: 1,339
Posted By coder76
Well, it's the usual horizontal HW-scrolling with...

Well, it's the usual horizontal HW-scrolling with the lava field. With copper, you can make several regions vertically which each have their own colors, scrollspeed, and bitmaps to scroll in.
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