Search found 632 matches

by oRBIT2002
Fri Mar 06, 2020 1:55 pm
Forum: NESdev
Topic: Coding a scrolltext
Replies: 28
Views: 10560

Re: Coding a scrolltext

I'm having issues with sprite 0 hit, the flag obviously isn't cleared when read so I'm getting hits on different scanlines all the time. Any secret technique here to master this? :)
by oRBIT2002
Tue Mar 03, 2020 1:39 pm
Forum: NESdev
Topic: Coding a scrolltext
Replies: 28
Views: 10560

Coding a scrolltext

It was along time ago I tried coding something on the NES and I have never coded a splitscreen scroll but I wanted to give it a try. I'm trying to code a simple scrolltext which means I want to scroll just a tiny portion of the screen. I guess I have to time it with a sprite 0-hit (this must be done...
by oRBIT2002
Fri Aug 17, 2018 1:13 pm
Forum: NESdev
Topic: Finding JSRs in PRG ROMs
Replies: 8
Views: 3684

Re: Finding JSRs in PRG ROMs

Perhaps my old FDS-Explorer might come in handy? :) It has a built-in disassembler (perhaps not state of the art but still..)
https://www.romhacking.net/utilities/662/
or
https://nes.goondocks.se/software.php
by oRBIT2002
Sun Oct 29, 2017 11:39 am
Forum: Homebrew Projects
Topic: VS Balloon Fight -> NES project
Replies: 7
Views: 6457

Re: VS Balloon Fight -> NES project

Haven't checked it out for awhile.. I suspect there's something to do with that there's only one CPU but I am not sure..
by oRBIT2002
Tue Sep 26, 2017 9:15 am
Forum: Homebrew Projects
Topic: VS Balloon Fight -> NES project
Replies: 7
Views: 6457

Re: VS Balloon Fight -> NES project

I've put this project on hold (temporary?) but it would be nice with some help.. :)
by oRBIT2002
Mon Sep 25, 2017 9:37 am
Forum: General Stuff
Topic: Technical information, Nintendo arcadegames?
Replies: 4
Views: 1927

Re: Technical information, Nintendo arcadegames?

The only "documentation" that exists seems to be in MAME-source? I expected more, but perhaps I'm spoiled with nesdev.com. :)
by oRBIT2002
Mon Sep 25, 2017 5:11 am
Forum: General Stuff
Topic: Technical information, Nintendo arcadegames?
Replies: 4
Views: 1927

Technical information, Nintendo arcadegames?

I am a little curious what kind of hardware Nintendo used in the arcades back in the good old days. Their VS-systems I am quite familiar with but I guess they used other stuff aswell? I noticed they're starting to re-release arcade games on Switch, "Mario Bros" is coming up in just a few days but th...
by oRBIT2002
Thu May 18, 2017 12:04 pm
Forum: Homebrew Projects
Topic: VS Balloon Fight -> NES project
Replies: 7
Views: 6457

VS Balloon Fight -> NES project

I wanted to see if it was possible getting VS Balloon Fight to play on a standard NES (at least in 1-player mode). Here's how far I've come: * The game "boots". Press START to insert coins and SELECT to start the game * Currently converted to MMC1, horizontal mirroring. * Palette is currently not co...
by oRBIT2002
Wed May 17, 2017 12:49 pm
Forum: NESdev
Topic: VS Dual System question about $4016
Replies: 8
Views: 3262

Re: VS Dual System question about $4016

By your explanation (which is a bit better now btw, thanks), this shared RAM at $6000, it can only be accessed by one system at a time?
And by "asserts /IRQ on the other CPU", you mean it actually triggers an IRQ on the other CPU when writing to $4016 when bit 2 is 0?
by oRBIT2002
Wed May 17, 2017 11:12 am
Forum: NESdev
Topic: VS Dual System question about $4016
Replies: 8
Views: 3262

Re: VS Dual System question about $4016

"In the DualSystem, connects to 1- /IRQ of the other CPU and 2- when high on the primary specifies that 2KiB of RAM is mapped from $6000-$7FFF, else mapped for the secondary CPU" "In the DualSystem, connects to 1- /IRQ of the other CPU and 2- when high on the primary" What does this mean? 1-? 2-? Hi...
by oRBIT2002
Wed May 17, 2017 10:39 am
Forum: NESdev
Topic: VS Dual System question about $4016
Replies: 8
Views: 3262

Re: VS Dual System question about $4016

Mostly everything to be honest. Can I get it in a little more newbie kind of way? :)
by oRBIT2002
Wed May 17, 2017 2:50 am
Forum: NESdev
Topic: VS Dual System question about $4016
Replies: 8
Views: 3262

VS Dual System question about $4016

The Wiki mentions this concerning $4016-writes (bit 2):
"In the DualSystem, connects to 1- /IRQ of the other CPU and 2- when high on the primary
specifies that 2KiB of RAM is mapped from $6000-$7FFF, else mapped for the secondary CPU"
What does this mean? :)
by oRBIT2002
Tue May 16, 2017 10:41 pm
Forum: General Stuff
Topic: VS Unisystem controllers & VS Balloon Fight
Replies: 1
Views: 1390

VS Unisystem controllers & VS Balloon Fight

My latest project is trying to get "VS Balloon Fight" to work on a standard NES. However, I've run into some issues concerning the controls. The Wiki mentions that reading $4016 retrieves player *2* controls and $4017 is control *1*. Is this information confirmed reliable? I can't get this behaviour...
by oRBIT2002
Thu Apr 20, 2017 11:54 am
Forum: General Stuff
Topic: ZappR ROM-hacking utility
Replies: 12
Views: 4771

Re: ZappR ROM-hacking utility

I've finally released my "ZappR Toolkit" on my website. It can compile your patches to a binary format (.ZPC) but also, of course, load & apply patches. This is a work-in-progress alpha-version but if you're a Windows-user (with .NET 3.5 installed) feel free to check it out. There's also another too...
by oRBIT2002
Sat Apr 15, 2017 12:29 pm
Forum: General Stuff
Topic: ZappR ROM-hacking utility
Replies: 12
Views: 4771

Re: ZappR ROM-hacking utility

A screenshot of my Work-in-progress. Everything in this image is embedded in the (compiled) patchfile itself (everything is optional of course). Time will tell if it gets finished and people will find it interesting enough to use it. :)