It is currently Mon Jul 16, 2018 8:01 am

All times are UTC - 7 hours





Post new topic Reply to topic  [ 17 posts ]  Go to page Previous  1, 2
Author Message
PostPosted: Fri Jul 06, 2018 8:01 pm 
Offline

Joined: Sun Apr 13, 2008 11:12 am
Posts: 7303
Location: Seattle
Great Hierophant wrote:
One curious thing however is that Rocket Games would display "ROCKET®", not "Nintendo®" on the bootup screen. The GBC checks some of these bytes to ensure that your ROM was displaying the correct name. Rocket Games presumably found a way to bypass the check, but when you replace the logo, the games work but now display Nintendo®.
BennVenn's analysis of Datel's Game Boy Modem indicated that the logo was stored in the MBC itself, and the MBC knows when to switch between the external ROM (for the desired logo) and the internal ROM (for the TMSS circumvention).

Unfortunately, BennVenn's apparently taken down his old analysis pages.


Top
 Profile  
 
PostPosted: Fri Jul 06, 2018 9:42 pm 
Offline

Joined: Tue Nov 23, 2004 9:35 pm
Posts: 662
lidnariq wrote:
Great Hierophant wrote:
One curious thing however is that Rocket Games would display "ROCKET®", not "Nintendo®" on the bootup screen. The GBC checks some of these bytes to ensure that your ROM was displaying the correct name. Rocket Games presumably found a way to bypass the check, but when you replace the logo, the games work but now display Nintendo®.
BennVenn's analysis of Datel's Game Boy Modem indicated that the logo was stored in the MBC itself, and the MBC knows when to switch between the external ROM (for the desired logo) and the internal ROM (for the TMSS circumvention).

Unfortunately, BennVenn's apparently taken down his old analysis pages.


Fortunately the Internet Archive has saved that page : https://web.archive.org/web/20150106134 ... l_MBC1.htm

Unfortunately it looks like someone is going to have to get out the logic analyzer to figure out what the Datel chip does. For the Shark MX, the extra features make sense, but for these simple games, its overkill. Moreover, I think the use of the pure Nintendo logo would have been covered by Sega v. Accolade.

_________________
Nerdly Pleasures - My Vintage Video Game & Computing Blog


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 17 posts ]  Go to page Previous  1, 2

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 1 guest


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