Big Bang Bar

jadziedzic · Joined: 02 Aug 2005 Posts: 151 Location: Nashua, NH USA

(I am re-posting this as a separate topic now that I have received Gene Cunningham's permission to distribute this patched software.)

I have created a patched BBB ROM that fixes the software's confusion over lamp 48B (the credit lamp on the apron) in the standard beta 1.9 ROM. This patch eliminates the spurious "1 info" report for lamp 48B when entering the troubleshooting menu. All that is changed is the lamp assignment table (lamp 48B now shows up as an assigned feature lamp named "CREDIT" in the diagnostics) and the version number string (it reports beta 1.9.P1).

The patched software may be downloaded from http://www.dziedzic.us/BBB/bbb109-p1.zip. You will need two 4 megabit EPROMs for the software.

Tony

P.S. For those interested, no, I don't have the game software source code. I spent some time with a disassembler to understand the operation of the diagnostics, and how the ROM checksum algorithm works. I wrote a couple of small utilities that allow me to combine the hii/lo split ROM images into a single binary file, and was able to feed that into a disassembler. Thank you to the behind-the-scenes helpers (you know who you are).
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Joseph "Tony" Dziedzic
BBB #39

BBB94 · Joined: 02 Aug 2005 Posts: 407 Location: WI, USA

Thanks so much for the time and effort you put into this.

I would love to learn stuff like this someday, but I don't think that's likely - especially if you needed helpers...

Bertl · Joined: 02 Aug 2005 Posts: 187 Location: Vienna/Austria

Many thanks, well done Exclamation

Brgds
Bertl

jadziedzic · Joined: 02 Aug 2005 Posts: 151 Location: Nashua, NH USA

BTW, I've sent an e-mail to John Wart, Jr. with a link to the patched code. If anyone needs a set of ROMs burned John's the guy.

FYI,
Tony
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Joseph "Tony" Dziedzic
BBB #39