Dragon's Lair Fans - Arcade Lifestyle

General Chat => Technical Area => Topic started by: Belike on January 07, 2016, 09:34:08 AM

Title: Gaplus graphic error
Post by: Belike on January 07, 2016, 09:34:08 AM

Found an interesting Gaplus pcb, it has the original japanese Namco customs, but there is also a Sidam sign on solder side.Made a jamma adapter, the game works, but the spaceship, the rockets and the alien bombs are stripped.It has two 2148 rams, that might be the problem, but I'm not sure.
Any ideas?
(https://lh3.googleusercontent.com/-Exz0SMer7pg/VowAY7PXd1I/AAAAAAAAJnE/mSH5hZDPdsI/s512-Ic42/WP_20160105_15_49_57_Pro.jpg)

(https://lh3.googleusercontent.com/-7nJuTaIHkyg/VowAZXhPmJI/AAAAAAAAJm0/eOT3UsxdPC0/s512-Ic42/WP_20160105_15_50_44_Pro.jpg)

(https://lh3.googleusercontent.com/-3SwK1FdQ0Zo/VowAZllEEeI/AAAAAAAAJns/mQf26Qo-xf8/s512-Ic42/WP_20160105_15_53_10_Pro.jpg)

(https://lh3.googleusercontent.com/-FWiHwZPQtsg/VowAZ-BS5EI/AAAAAAAAJng/WI6s-3G5yd8/s512-Ic42/WP_20160105_15_53_26_Pro.jpg)

Title: Re: Gaplus graphic error
Post by: ajhippel on January 07, 2016, 11:17:04 AM

just a guess without knowing the schematics:

a contact problem with the graphic-roms? try to check the sockets and clean the legs of the graphic-Eproms

Title: Re: Gaplus graphic error
Post by: Belike on January 07, 2016, 12:59:56 PM

Thanks, will check those. ;)

Title: Re: Gaplus graphic error
Post by: neocps1 on January 08, 2016, 01:22:10 PM

most likely a sprite buffer ram problem

Title: Re: Gaplus graphic error
Post by: Belike on January 08, 2016, 01:49:15 PM

Quote from: neocps1 on January 08, 2016, 01:22:10 PM

most likely a sprite buffer ram problem

Thanks for the input. :)
The 2148 is a spirte buffer ram?