bencao74
Member
Hey
I`m the owner of this wonderfull Pole Position sitdown.
http://4.bp.blogspot.com/-fQvrePELw7Y/T7zWjnzWxvI/AAAAAAAAEVo/pSmUedHKOQU/s320/IMG_0573.JPG
Here is the roadtrip driving thru half europe to get it.
I even bougth the topper from takeman and imported it to EU 
http://bencao74.blogspot.de/2012/06/gameroom-pole-position-topper.html
So I really like this cab, but... the color red is missing.
I traced down the schematic for PIN 9 RED via R103->R59 -> down to
Custom PROM 136014-137.
This one has a strange addition from one of the pre-owners. There is capacitor between pin 12 and GND.
When I cut this capacitor I get screen with lot of funny characters with red working. But the game isn't playable.
When I leave the cap in place the game works without red.
So I guess this PROM is defect. Additionally the pre-owner was trying to bridge the PROM.
Where can I get a new one? Is it possible to re-program this PROM?
Thanks
Jochen
I`m the owner of this wonderfull Pole Position sitdown.
http://4.bp.blogspot.com/-fQvrePELw7Y/T7zWjnzWxvI/AAAAAAAAEVo/pSmUedHKOQU/s320/IMG_0573.JPG
Here is the roadtrip driving thru half europe to get it.
http://bencao74.blogspot.de/2012/06/gameroom-pole-position-topper.html
So I really like this cab, but... the color red is missing.
I traced down the schematic for PIN 9 RED via R103->R59 -> down to
Custom PROM 136014-137.
This one has a strange addition from one of the pre-owners. There is capacitor between pin 12 and GND.
When I cut this capacitor I get screen with lot of funny characters with red working. But the game isn't playable.
When I leave the cap in place the game works without red.
So I guess this PROM is defect. Additionally the pre-owner was trying to bridge the PROM.
Where can I get a new one? Is it possible to re-program this PROM?
Thanks
Jochen