It is currently Sat Oct 21, 2017 12:29 pm

All times are UTC - 7 hours





Post new topic Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Thu Jan 31, 2013 5:18 pm 
Offline

Joined: Tue Mar 08, 2011 9:45 am
Posts: 64
In my ROM database, I have two ROMs which have been identified by GoodNES.

"Scanline PPU Test by Quietust (PD).nes" and "Scanline PPU Test by Quietust (PD) [a1].nes"

Interestingly enough, in my emulator, the "a1" version seems to work generally well. No stars are shown (there is a little flickering with the "|" characters between the text and stars. But, the non "a1" version doesn't seem to work correctly at all.

When I try these ROMs in neciside, neciside seems to run them both without any issue (no stars shown).

So, I guess what it boils down to (and please Quietust if you recall, please chime in)... What is the primary difference between these 2 roms? When I goto Quietust's web site, the ROM he has for download is the same as my "a1" version. So I suppose that's the latest version.

Thoughts?


Top
 Profile  
 
PostPosted: Thu Jan 31, 2013 5:43 pm 
Offline
NESICIDE developer
User avatar

Joined: Mon Oct 13, 2008 7:55 pm
Posts: 1026
Location: Minneapolis, MN
proxy wrote:
In my ROM database, I have two ROMs which have been identified by GoodNES.

So, I guess what it boils down to (and please Quietust if you recall, please chime in)... What is the primary difference between these 2 roms? When I goto Quietust's web site, the ROM he has for download is the same as my "a1" version. So I suppose that's the latest version.

Thoughts?


I apparently only have this version...so I don't know what's different. But have you tried the simple stuff like comparing the ROMs in a hex editor?

Could you post both ROMs somewhere?


Top
 Profile  
 
PostPosted: Thu Jan 31, 2013 7:00 pm 
Offline

Joined: Tue Mar 08, 2011 9:45 am
Posts: 64
OK, that version seems to be the same as my "a1" version. (no stars shown). The difference in the files is definitely more than just a few bytes. So a hex dump comparison is unlikely to be very useful in itself. I've uploaded the .nes files and I've also uploaded the disassembly of the files (using disasm6) to here:

http://codef00.com/files/
http://codef00.com/files/Scanline%20PPU%20Test%20by%20Quietust%20(PD)%20%5ba1%5d.asm
http://codef00.com/files/Scanline%20PPU%20Test%20by%20Quietust%20(PD)%20%5ba1%5d.chr
http://codef00.com/files/Scanline%20PPU%20Test%20by%20Quietust%20(PD)%20%5ba1%5d.nes
http://codef00.com/files/Scanline%20PPU%20Test%20by%20Quietust%20(PD).nes
http://codef00.com/files/Scanline%20PPU%20Test%20by%20Quietust%20(PD).asm
http://codef00.com/files/Scanline%20PPU%20Test%20by%20Quietust%20(PD).chr


Top
 Profile  
 
PostPosted: Thu Jan 31, 2013 8:38 pm 
Offline
User avatar

Joined: Sun Sep 19, 2004 9:28 pm
Posts: 3192
Location: Mountain View, CA, USA
Quietust hangs out here on occasion, so you could send him a PM and ask him to explain the differences. He's a smart guy, he almost certainly knows. :-)


Top
 Profile  
 
PostPosted: Fri Feb 01, 2013 8:42 am 
Offline

Joined: Sun Sep 19, 2004 11:12 pm
Posts: 19114
Location: NE Indiana, USA (NTSC)
Should I test both on my PowerPak tonight?


Top
 Profile  
 
PostPosted: Fri Feb 01, 2013 7:46 pm 
Offline
User avatar

Joined: Sun Sep 19, 2004 10:59 pm
Posts: 1389
I answered this question on IRC: the non-"[a1]" version is simply an old version of the ROM which didn't actually work correctly, while the "[a1]" version is the latest version (which actually does work and can also be found on my site).

_________________
Quietust, QMT Productions
P.S. If you don't get this note, let me know and I'll write you another.


Top
 Profile  
 
PostPosted: Sat Feb 02, 2013 10:05 am 
Offline

Joined: Tue Mar 08, 2011 9:45 am
Posts: 64
Interestingly enough, I think the old version is somehow sensitive to APU frame IRQs. They aren't currently implemented in my emulator. But when I started to play with adding them to my APU implementation, the old version started to work...

The last blurb of text gets really garbled, but I can get it to not show the stars.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 4 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