Search found 760 matches

by TmEE
Sat Sep 26, 2020 8:09 am
Forum: General Stuff
Topic: What chips should be in that PCB?
Replies: 5
Views: 306

Re: What chips should be in that PCB?

28pin PLCC part doesn't seem to match any display driver chips that google could show me... I thought maybe the 44pin PLCC is an Altera MAX7000 part but power pins do not match, also Lattice Mach1/2 chips have different power pins too...maybe Atmel has anything that might fit... Last one looks like ...
by TmEE
Thu Sep 17, 2020 10:21 pm
Forum: General Stuff
Topic: Looks like NESCartDB is down (again)...
Replies: 69
Views: 25113

Re: Looks like NESCartDB is down (again)...

The original one can be alias of whatever ends up being the new one, so that all old links can still work, or at least I think it is possible to do.
by TmEE
Fri Sep 04, 2020 2:56 am
Forum: General Stuff
Topic: The learning process
Replies: 6
Views: 1050

Re: The learning process

I do read up a bit first on what I'm getting into so I know what will I need to achieve something, but actually doing things will be hands on trying out stuff and seeing how it works (or doesn't). Over time all the building blocks are learned and rest is just assembling them to build the house lol
by TmEE
Wed Aug 26, 2020 11:55 pm
Forum: SNESdev
Topic: SNES native 3D performance ST-NICC no SFX demo
Replies: 72
Views: 7128

Re: SNES native 3D performance ST-NICC no SFX demo

However like the VICII, are the PPUs the clock masters. So if you switch the PPU to "50hz", does this also modify the clock speeds to be PAL or does the PPU run "50hz" timings, for vblank, hblank, active display etc off the NTSC Master clock? Or does it drop to PAL Master Clock. In typical hardware...
by TmEE
Tue Aug 25, 2020 10:32 pm
Forum: SNESdev
Topic: SNES native 3D performance ST-NICC no SFX demo
Replies: 72
Views: 7128

Re: SNES native 3D performance ST-NICC no SFX demo

running NTSC at 50fps won't make it work the same as PAL, in that you won't get the PAL demo working on it. FPS is not the issue, Clocks per Frame and VBlank timings are the issue. Which PAL and NTSC mandate. I primarly meant things on video standard level, most hardware outputs RGB which is neithe...
by TmEE
Sun Aug 23, 2020 5:34 pm
Forum: SNESdev
Topic: SNES native 3D performance ST-NICC no SFX demo
Replies: 72
Views: 7128

Re: SNES native 3D performance ST-NICC no SFX demo

I do think the whole PAL and NTSC stuff should be dropped and only 50/60 used. I can run 50 or 60Hz in any of the video standards, including stuff that normally doesn't exist like NTSC or PAL-M in 50Hz etc, only thing that really matters on software standpoint is the framerate.
by TmEE
Tue Aug 18, 2020 11:20 am
Forum: General Stuff
Topic: Nintendo "Gigaleak"
Replies: 61
Views: 12207

Re: Nintendo "Gigaleak"

Windows only kept first 20 colors fixed in 8bit modes (16 EGA default colors and 4 variable ones only used by UI elements), remaining colors could have been changed by programs running, with visible color clash as windows were changed.
by TmEE
Mon Aug 17, 2020 11:59 am
Forum: General Stuff
Topic: Nintendo "Gigaleak"
Replies: 61
Views: 12207

Re: Nintendo "Gigaleak"

Windows had to support a fixed 16 color palette, which is the reason for its "odd" color choices. In theory they could have reprogrammed the colors to something else since VGA should allow it but I'm sure there was some supported video hardware that couldn't...
by TmEE
Thu Aug 06, 2020 6:02 pm
Forum: SNESdev
Topic: [demo] SNES Sonic
Replies: 143
Views: 34906

Re: [demo] SNES Sonic

This is awesome ! I'm gonna have to dig up my SNES and GameDoctor and attempt to run this on the real hardware
by TmEE
Mon Jul 27, 2020 7:53 am
Forum: General Stuff
Topic: Making "Good" Assembly Code
Replies: 73
Views: 12945

Re: Making "Good" Assembly Code

SuperH and ARM use MOV syntax too. I'm one of those who like LD, but because it is less to type and sort of makes more sense. XOR I have seen as such from all the electronics things, there never has been EOR in any books etc. so seeing it always made me think "why is it EOR and not XOR" lol. I prono...
by TmEE
Mon Jul 20, 2020 2:15 am
Forum: Other Retro Dev
Topic: Megadrive VDP H40 timing
Replies: 4
Views: 1556

Re: Megadrive VDP H40 timing

I imagine the "why" is deeply rooted in the video generation logic, and probably has to do something with extending H256 to add extra pixels for making H320 but the guy in charge probably wasn't thinking about timings all that much and only added a new 64 pixel column and whatever it takes to get en...
by TmEE
Sun Jul 19, 2020 2:40 pm
Forum: Other Retro Dev
Topic: Megadrive VDP H40 timing
Replies: 4
Views: 1556

Re: Megadrive VDP H40 timing

H320 is normally using external pixel clock which is 8/9/10 cycles during HSync period, to gain same timings as H256 with its only 10 clock long pixels. When internal pixel clock is used for H320 it turns "H320F" where lines last less time and line rate becomes higher. (H256F is H256 with external p...
by TmEE
Fri Jul 17, 2020 4:31 am
Forum: SNESdev
Topic: Direct color vs "mega color", What he says about the difference?
Replies: 7
Views: 1848

Re: Direct color vs "mega color", What he says about the difference?

There's a method to display an arbitrary bitmap on MD in full 9bit RGB color by disabling rendering and doing a large DMA to first color of the palette, but since there's one access slot every 2 pixels you get double wide pixels and also 4x wide ones 5 times per line due to refresh slots using up on...
by TmEE
Thu Jul 16, 2020 5:01 am
Forum: SNESdev
Topic: Direct color vs "mega color", What he says about the difference?
Replies: 7
Views: 1848

Re: Direct color vs "mega color", What he says about the difference?

This method is basically relying on ability to change most of the palette each line, by turning off rendering during offscreen parts in a way that results in just enough disruption to be able to show what is necessary. All sprites are lost, one BG layer won't work and most of the other BG layer is l...
by TmEE
Mon Jun 22, 2020 12:28 am
Forum: Other Retro Dev
Topic: Hardware test program for Genesis Justifier, Menacer and\or ALG GAMEGUN?
Replies: 57
Views: 15746

Re: Hardware test program for Genesis Justifier, Menacer and\or ALG GAMEGUN?

...And also cause level 2 interrupt for the CPU. The TH pin (7) on the controller port does that on high to low transition. The only thing that can create that transition is the comparator etc. in the gun and when its output isn't doing it the problem is either the comparator itself or its input isn...