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sverx wrote

Well, if I understand correctly, the crash doesn't really happen because of bugs but because the score calculation happens to eat too many CPU cycles later on.
In other words, even with all the bugs still present, if one replaces the current code that handles the score with something that performs in a (safe) fixed amount of time - which is totally possible - then the resulting ROM will be still bugged but won't crash.

Am I wrong? :|

Right, that was part of the issue! That delay would cause the interrupt to happen before the code loop is done. If that happens after a jump destination is stored in RAM, but before it's used, the address in RAM gets spoiled, and the program jumps to an unintended address.

A raytracer implemented as a ASIC:

i will post 2 videos about pallete/color cycling for animations.

These video pointed for this

Very interesting.

I had seen those palette cycling images by the Lucasart guy a long time ago. Completely baffled by them and questioning how on earth that was done.

I'm glad to see this video where he explains how he actually did it. He really took it to the next level, and several levels beyond :).

An interesting tool for making ZX Spectrum games:

https://youtu.be/W_0pHEElLG0

I wish the Master System had a modem, and that I had the appropriate expansion cards for this System/36...

Among my midranges I also have a Sun Enterprise 4500 wich could be interesting to bring up to work.

I may be crazy, but I think those old big computers have no purpose on their life and maybe serving as servers for old consoles in some sort of old fashioned LAN could be a good enough role for them.

What do you think about?

Bock wrote

6502 emulator with full map of the chipset, running on the web
https://floooh.github.io/visual6502remix/

There's a Z80 version online too:
https://floooh.github.io/visualz80remix/

Bock wrote

Bock wrote

6502 emulator with full map of the chipset, running on the web
https://floooh.github.io/visual6502remix/

There's a Z80 version online too:
https://floooh.github.io/visualz80remix/

pretty impressive!!!

Interesting video explaining Bresenham's algorithm, fixed point numbers, perspective projection and 3D rotation, all in Z80 ASM:

Interesting video about numbers generated randomly.

SMS work in same way?

It’s sort of the same, yes. There are algorithms other than LFSRs but the rest is the same. We can also use the r register as a source of randomness on SMS.

Interesting Megamania clone for the MSX:

How to use aseprite to create level maps:

Interesting explanation about techniques used on C64 point and click adventures:

A chiptune generator:
https://www.vitling.xyz/toys/autotracker/

A technical explanation about how to fake text rotation on the C64.. looks doable on the SMS:

Author	Message
Jabberwocky Joined: 07 Apr 2021 Posts: 21	Posted: Wed Mar 20, 2024 3:53 pm
Jabberwocky Joined: 07 Apr 2021 Posts: 21	sverx wrote Well, if I understand correctly, the crash doesn't really happen because of bugs but because the score calculation happens to eat too many CPU cycles later on. In other words, even with all the bugs still present, if one replaces the current code that handles the score with something that performs in a (safe) fixed amount of time - which is totally possible - then the resulting ROM will be still bugged but won't crash. Am I wrong? :\| Right, that was part of the issue! That delay would cause the interrupt to happen before the code loop is done. If that happens after a jump destination is stored in RAM, but before it's used, the address in RAM gets spoiled, and the program jumps to an unintended address.

haroldoop Joined: 25 Feb 2006 Posts: 895 Location: Belo Horizonte, MG, Brazil	Posted: Wed Mar 27, 2024 3:26 pm
	A raytracer implemented as a ASIC:

segarule Joined: 23 Jan 2010 Posts: 453	Posted: Sat May 04, 2024 6:24 pm
segarule Joined: 23 Jan 2010 Posts: 453	i will post 2 videos about pallete/color cycling for animations. These video pointed for this Very interesting.

slogra Joined: 09 Jun 2014 Posts: 405	Posted: Sat May 04, 2024 9:19 pm
slogra Joined: 09 Jun 2014 Posts: 405	I had seen those palette cycling images by the Lucasart guy a long time ago. Completely baffled by them and questioning how on earth that was done. I'm glad to see this video where he explains how he actually did it. He really took it to the next level, and several levels beyond :).

haroldoop Joined: 25 Feb 2006 Posts: 895 Location: Belo Horizonte, MG, Brazil	Posted: Fri May 10, 2024 8:24 pm
	An interesting tool for making ZX Spectrum games:

Bits Passats Joined: 14 Feb 2024 Posts: 17 Location: Andorra	Posted: Mon May 20, 2024 1:58 pm
	https://youtu.be/W_0pHEElLG0 I wish the Master System had a modem, and that I had the appropriate expansion cards for this System/36... Among my midranges I also have a Sun Enterprise 4500 wich could be interesting to bring up to work. I may be crazy, but I think those old big computers have no purpose on their life and maybe serving as servers for old consoles in some sort of old fashioned LAN could be a good enough role for them. What do you think about?

Bock Site Admin Joined: 08 Jul 2001 Posts: 8693 Location: Paris, France	Posted: Fri May 24, 2024 2:20 pm
	Bock wrote 6502 emulator with full map of the chipset, running on the web https://floooh.github.io/visual6502remix/ There's a Z80 version online too: https://floooh.github.io/visualz80remix/

sverx Joined: 05 Sep 2013 Posts: 3912 Location: Stockholm, Sweden	Posted: Sat May 25, 2024 1:07 pm
	Bock wrote Bock wrote 6502 emulator with full map of the chipset, running on the web https://floooh.github.io/visual6502remix/ There's a Z80 version online too: https://floooh.github.io/visualz80remix/ pretty impressive!!!

haroldoop Joined: 25 Feb 2006 Posts: 895 Location: Belo Horizonte, MG, Brazil	Posted: Thu May 30, 2024 11:22 pm
	Interesting video explaining Bresenham's algorithm, fixed point numbers, perspective projection and 3D rotation, all in Z80 ASM:

segarule Joined: 23 Jan 2010 Posts: 453	Posted: Tue Jun 11, 2024 5:26 pm
segarule Joined: 23 Jan 2010 Posts: 453	Interesting video about numbers generated randomly. SMS work in same way?

Maxim Site Admin Joined: 19 Oct 1999 Posts: 14834 Location: London	Posted: Tue Jun 11, 2024 8:05 pm
	It’s sort of the same, yes. There are algorithms other than LFSRs but the rest is the same. We can also use the r register as a source of randomness on SMS.

haroldoop Joined: 25 Feb 2006 Posts: 895 Location: Belo Horizonte, MG, Brazil	Posted: Tue Jun 18, 2024 8:09 pm
	Interesting Megamania clone for the MSX:

segarule Joined: 23 Jan 2010 Posts: 453	Posted: Wed Jun 19, 2024 9:55 am
segarule Joined: 23 Jan 2010 Posts: 453	How to use aseprite to create level maps:

haroldoop Joined: 25 Feb 2006 Posts: 895 Location: Belo Horizonte, MG, Brazil	Posted: Sat Jul 06, 2024 1:01 pm
	Interesting explanation about techniques used on C64 point and click adventures:

haroldoop Joined: 25 Feb 2006 Posts: 895 Location: Belo Horizonte, MG, Brazil	Posted: Sun Jul 21, 2024 10:55 pm
	A chiptune generator: https://www.vitling.xyz/toys/autotracker/

haroldoop Joined: 25 Feb 2006 Posts: 895 Location: Belo Horizonte, MG, Brazil	Posted: Wed Jul 24, 2024 1:03 am
	A technical explanation about how to fake text rotation on the C64.. looks doable on the SMS:

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