Teknotoyz
Well-known member
PROJECT: 1985 Gauntlet I made into a Dual Gauntlet (I & II) machine.
I wanted to document my ongoing project of converting a dedicated Gauntlet I machine to a Dual boot Gauntlet I & II machine.
DISCLAIMER: There will be no harm done to the subject arcade machine!
PURPOSE: I have limited space, so 2 Gauntlet cabinets is out of the question. GII is supposed to be more fun, but GI is the classic (I want both!).
The original thread that caught my interest is here:
http://forums.arcade-museum.com/showthread.php?t=69472&highlight=gauntlet+rom+switch
I owe thanks to Steph for his help on this project.
SIMPLE THEORY:
Both Gauntlet I & II use the same hardware, conversion from GI to GII is simple, just replace/add 19 chips. To make a dual boot machine, there are 12 eproms that will need to be double sized to hold complete images for I AND II. When a switch is installed, the addressing changes from one to the other so the PCB only reads the desired game programming. While GII has more eproms, the GI program will ignore the extra ones when the switch is in GI mode.
As I have learned, this is cheaper to do when starting from a GII machine as you don't need the 6 dedicated GII eproms and single prom. Anyway, I placed the order, made the payment, and the GII and Dual chips arrived today. I will post pictures and updates as I get time to get everything installed. I will not be changing any cabinet artwork, it will remain Gauntlet I original.
I wanted to document my ongoing project of converting a dedicated Gauntlet I machine to a Dual boot Gauntlet I & II machine.
DISCLAIMER: There will be no harm done to the subject arcade machine!
PURPOSE: I have limited space, so 2 Gauntlet cabinets is out of the question. GII is supposed to be more fun, but GI is the classic (I want both!).
The original thread that caught my interest is here:
http://forums.arcade-museum.com/showthread.php?t=69472&highlight=gauntlet+rom+switch
I owe thanks to Steph for his help on this project.
SIMPLE THEORY:
Both Gauntlet I & II use the same hardware, conversion from GI to GII is simple, just replace/add 19 chips. To make a dual boot machine, there are 12 eproms that will need to be double sized to hold complete images for I AND II. When a switch is installed, the addressing changes from one to the other so the PCB only reads the desired game programming. While GII has more eproms, the GI program will ignore the extra ones when the switch is in GI mode.
As I have learned, this is cheaper to do when starting from a GII machine as you don't need the 6 dedicated GII eproms and single prom. Anyway, I placed the order, made the payment, and the GII and Dual chips arrived today. I will post pictures and updates as I get time to get everything installed. I will not be changing any cabinet artwork, it will remain Gauntlet I original.
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