Search found 489 matches

by infidelity
Tue Feb 22, 2022 4:12 am
Forum: SNESdev
Topic: Contemplating port from Genesis, but can snes do 320x224?
Replies: 11
Views: 1195

Re: Contemplating port from Genesis, but can snes do 320x224?

Thank you for all of that in depth information! You mention "cropping", would that constitute me using a method as you see in the intro to Super Mario World, where there is a wooden boarder around the center of the screen?
by infidelity
Mon Feb 21, 2022 1:21 pm
Forum: SNESdev
Topic: Contemplating port from Genesis, but can snes do 320x224?
Replies: 11
Views: 1195

Contemplating port from Genesis, but can snes do 320x224?

Looking to study up on the 68000 language, but I'd like to port a title that runs in 320x224, can the snes do that?

Thanks!
by infidelity
Wed Dec 15, 2021 2:37 pm
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

I found out nesdev is back! It went down around the time I finished my port in August! History http://acmlm.kafuka.org/board/thread.php?id=9337 Twitter announcement https://twitter.com/infidelity_nes/status/1429259741000257545?t=my4hIQY_cz_n7zAlH4Hf9A&s=19 Twitter announcement of revision A http...
by infidelity
Wed Jun 23, 2021 5:40 am
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

update: I've nailed the hiccup with my incorrect tilemap appearing during an irq firing up.

As of writing this, I just played through an entire stage of the game, with zero glitches to report. :-)
by infidelity
Tue Jun 22, 2021 6:17 am
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

Having a very difficult time keeping my hdma irq split functional, while horizontally scrolling. When I enter a room where the upper half of the screen needs to move up and down, it does it. But soon after when I'm moving and sprites appear, the hdma split starts to spread apart? I got myself to a p...
by infidelity
Mon Jun 21, 2021 6:00 am
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

Idk. However, I've now just figured out the equations for going down! :-D just finished tightening up the code. I'm at work now, but will write out exactly what it all is. :-) update when an irq split screen is activated that moves up & down, the gap between screens is still present, will need t...
by infidelity
Mon Jun 21, 2021 4:19 am
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

Are you sure it was the top portion that was off? That seems very weird. Keep in mind that "neutral" vscroll on SNES is -1 because of the blank line 0. From my observation yes, it was the top that was the issue when I came to needing to alter the table, after 7F has been read for # of sca...
by infidelity
Sun Jun 20, 2021 6:03 pm
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

Excellent! I figured there was probably some way to rig the table to get away with a minimum of rewriting, but I decided not to complicate things... anyway, it's good to hear you got it working. One question - why does the initial scroll value ($7E:8001) get decremented? Is that just the normal scr...
by infidelity
Sun Jun 20, 2021 4:39 pm
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

you don't have to go from the top of the screen to the split in one leap - you can wait some number of lines less than 128, write the same top-of-screen scroll value over again (which does nothing to the display), and then wait the rest of the interval and write the split value. It extends the tabl...
by infidelity
Sun Jun 20, 2021 1:56 pm
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

Can edit specific registers during h-blank
by infidelity
Sun Jun 20, 2021 1:25 pm
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

this nes game has the screens side by side when accessing a vertical porition of the stage. You say make the table bigger, but i'm confused as to how i'm supposed to keep doing what i'm doing, once i reach 7F in my first byte? I've been altering bytes on the fly to try to see a difference but i cant...
by infidelity
Sun Jun 20, 2021 9:49 am
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

You are correct, 94143. I guess what I wrote was way off. I ran some tests, just to confirm. Once you enable HDMA, it runs every frame and resets the table automatically, just before drawing the first scanline. The first value in the table is transferred before the wait (not after), and affects eve...
by infidelity
Sun Jun 20, 2021 5:17 am
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

Everything honestly. The only thing I have working, is the prep work for the hdma in regards to where to load the hdma table. Im going to have my table located at 7E:8000. I dont know how big the table is supposed to be either. I work better with visual aids, step by step. I've tried searching the i...
by infidelity
Sat Jun 19, 2021 5:04 pm
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

I'm sorry I'm new to hdma and its just confusing to me. I'm going to hold off and move on with the port.
by infidelity
Sat Jun 19, 2021 3:10 pm
Forum: SNESdev
Topic: Need guidance with nes to snes. UPDATE: Port Complete of Mega Man IV + MSU-1
Replies: 335
Views: 95670

Re: Need guidance with nes to snes.

Also, why are you loading a value and branching on it, only to load it again at the branch target? Can't you assume that you arrive at LDA $FA with the value already in the accumulator? I'm just testing, trying different things, this wont be in the final code I use. So should I stick with using rom...