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Arcade King
13th May 2009, 02:37 PM
Brad's Original Black Dragon (Tiger) PCB

PCB was missing 2 roms a 27512 @ 9B and 27256 @ 2N

The rom at 2N is for all the in game foreground text and 9B is part of the background.

First things first replaced the 2 missing roms.

Problem: Foreground text is all messed up.

http://aussiearcade.com/uploads/AK/IMG_1757.jpg

Fix. Pin 23 (A11) on rom 2N was stuck High. Tracked back to pin 2 of a 74ls253 @ 3N. Replacing the chip fixed the problem.

Problem: Character Graphics have faint horizontal lines through them.

http://aussiearcade.com/uploads/AK/IMG_1758.jpg

Fix: Faulty 74ls253 @ 2K. Both chips were TI (Texas Instruments) branded IC's

Board now 100%

http://aussiearcade.com/uploads/AK/IMG_1766.jpg

Brad
13th May 2009, 02:52 PM
w00t and thanks a bunch for fixing one of my favourite games! =)

She looks very purdy now!

Brad

Arcade King
13th May 2009, 02:53 PM
Had the pcb running for a few hours hasn't missed a beat :)