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Forum: Nostalgia & memories 16 January 2020, 17:28
Replies: 153
Views: 5,288
Posted By coder76
This Virtual Karting game runs on an unexpanded...

This Virtual Karting game runs on an unexpanded A1200, can the MD do similar? It uses some pretty ugly dithered texturemapping, but speed is good. You get 50 FPS with a faster accelerator card.
...
Forum: Retrogaming General Discussion 07 January 2020, 14:07
Replies: 62
Views: 3,086
Posted By coder76
The A500 was good of course when it was released,...

The A500 was good of course when it was released, but certain arcade games were beyond its capabilities already from the start. Like SEGAs superscaler boards used in many games, like Outrun, Hang-On,...
Forum: Retrogaming General Discussion 06 December 2019, 19:46
Replies: 30
Views: 853
Posted By coder76
It was Scramble, at least this is the first...

It was Scramble, at least this is the first arcade game I can remember. It's still a pretty good game, the meteor swarm part was difficult to navigate through, and only a few players could get past...
Forum: Amiga scene 26 November 2019, 14:08
Replies: 979
Views: 140,593
Posted By coder76
Well, ECS/AGA chipset is needed, but those modes...

Well, ECS/AGA chipset is needed, but those modes are not too useful on ECS, since it still runs with OCS graphics bandwidth. Good to hear that it has been fixed in 3.1.4.
Forum: Retrogaming General Discussion 02 November 2019, 09:24
Replies: 22
Views: 1,640
Posted By coder76
It's not a problem these days. Back in the days...

It's not a problem these days. Back in the days large games were distributed on floppies on the PC and Amiga, but you had to install them on a harddisk for playing anyway. And then games moved onto...
Forum: Retrogaming General Discussion 01 November 2019, 11:34
Replies: 50
Views: 2,187
Posted By coder76
Well, some more nice looking games were made for...

Well, some more nice looking games were made for AGA machines in 1997-1999.
T-Zero
https://m.youtube.com/watch?v=iQvkCUG6gmo
Napalm
https://m.youtube.com/watch?v=_1NdAYc-Vz0
OnEscapee...
Forum: Amiga scene 25 October 2019, 10:10
Replies: 994
Views: 60,841
Posted By coder76
It's still possible to go a long way in terms of...

It's still possible to go a long way in terms of audio with the A1200, provided you got the memory and a better CPU. 14-bit audio and mixing up more channels with CPU. Also, with certain screenmodes...
Forum: Amiga scene 25 October 2019, 08:39
Replies: 994
Views: 60,841
Posted By coder76
I'm not sure if 16-bit audio @ 44 kHz would have...

I'm not sure if 16-bit audio @ 44 kHz would have been too useful at the time the A1200 was released. At least it would not have been used in most games, as sound samples with that sort of resolution...
Forum: Retrogaming General Discussion 02 September 2019, 11:22
Replies: 8
Views: 761
Posted By coder76
With double kHz modes, like DBLPAL, and VGA you...

With double kHz modes, like DBLPAL, and VGA you need to set superhires bit on for 640x512@50 Hz and 640x480 @ 60 Hz. When using 640x256 and 640x240 you still need to have superhires bit on, and the...
Forum: Amiga scene 18 July 2019, 15:59
Replies: 994
Views: 60,841
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, 15:34
Replies: 994
Views: 60,841
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, 22:48
Replies: 994
Views: 60,841
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, 14:50
Replies: 9
Views: 892
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, 13:07
Replies: 66
Views: 3,294
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, 23:48
Replies: 407
Views: 38,101
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, 22:52
Replies: 407
Views: 38,101
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, 23:41
Replies: 147
Views: 10,237
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, 14:04
Replies: 147
Views: 10,237
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, 19:53
Replies: 7
Views: 885
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, 15:47
Replies: 28
Views: 2,933
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, 21:16
Replies: 1,000
Views: 44,602
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, 21:01
Replies: 152
Views: 10,834
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, 18:34
Replies: 152
Views: 10,834
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, 17:54
Replies: 70
Views: 3,288
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, 10:26
Replies: 70
Views: 3,288
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, 23:46
Replies: 70
Views: 3,288
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, 15:16
Replies: 341
Views: 63,721
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, 12:11
Replies: 67
Views: 4,288
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, 19:37
Replies: 1,000
Views: 44,602
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, 22:13
Replies: 62
Views: 15,678
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, 23:22
Replies: 153
Views: 17,292
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, 01:21
Replies: 106
Views: 15,856
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, 16:55
Replies: 45
Views: 4,278
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, 14:05
Replies: 45
Views: 4,278
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, 13:48
Replies: 45
Views: 4,278
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, 19:45
Replies: 587
Views: 55,988
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, 22:18
Replies: 587
Views: 55,988
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, 18:35
Replies: 587
Views: 55,988
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, 17:22
Replies: 587
Views: 55,988
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, 17:59
Replies: 54
Views: 10,850
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...
Showing results 1 to 40 of 87

 
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