It is currently Fri Oct 20, 2017 7:17 am

All times are UTC - 7 hours





Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Mon May 23, 2016 3:24 pm 
Offline
User avatar

Joined: Fri Nov 19, 2004 7:35 pm
Posts: 3943
Should there be a submapper to formalize a compatiblity mode for buggy hacked MMC3 roms (Mario Adventure) that use both sides of the pattern table for sprites, and also use the IRQ counter?

This could be defined as ignoring A12 falls during sprite render time.

_________________
Here come the fortune cookies! Here come the fortune cookies! They're wearing paper hats!


Top
 Profile  
 
PostPosted: Tue May 24, 2016 8:49 am 
Offline
User avatar

Joined: Fri Nov 12, 2004 2:49 pm
Posts: 7231
Location: Chexbres, VD, Switzerland
What's the point of even supporting ROMs that never successfully ran on real hardware ? If those were made for a specific versuib of an emulator, the only solution is to use this specific version.


Top
 Profile  
 
PostPosted: Tue May 24, 2016 9:39 am 
Offline

Joined: Sun Sep 19, 2004 11:12 pm
Posts: 19107
Location: NE Indiana, USA (NTSC)
The Mario Adventure mapper is about as similar to the MMC3 as the MC-ACC is, and that's certainly hardware. A hardware implementation requires these steps:
  1. Clone the MMC3 in Verilog.
  2. Change the interval timer's PA12 rise spreading function from the typical 3-4 M2 cycles to 30 or so cycles.
  3. Find a scene that causes problems in Mario Adventure, and test the mapper there.

Once someone publishes the Verilog of MMC3MA, then I'll feel confident in allocating the mapper number.


Top
 Profile  
 
PostPosted: Sat May 28, 2016 2:44 pm 
Offline
User avatar

Joined: Fri Nov 19, 2004 7:35 pm
Posts: 3943
Easiest scene that causes problems, Beanstalk appearing (for a few frames) and holding a holdable brick. Easily triggerable in level 1.

_________________
Here come the fortune cookies! Here come the fortune cookies! They're wearing paper hats!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group