When I power on Shaq Attaq it says EPROM CHECKSUM FF-12
Does this tell me the FF-12 EPROM that's labeled in the manual is bad? Thank you.
(Topic ID: 207022)
Wichita, KS
Quoted from scampcamp:When I power on Shaq Attaq it says EPROM CHECKSUM FF-12
Does this tell me the FF-12 EPROM that's labeled in the manual is bad? Thank you.
Are you having an actual problem with the game? Or just wondering what a checksum is for?
A checksum is just a calculation of all the game rom's data that results in a short alphanumeric code. If there's an error in the data, the checksum won't match the expected value.
Zeist
Quoted from MarAlb:$FF12 is the checksum from a shaq revision 5 gamerom. Everything is fine here and you are running the latest revision. Gott system 3 is Always showing the checksum after powering up.
Ok great, thank you very much.
I am trying to figure out why the loud buzz from the under cabinet speaker. A friend said it may be capacitors on sound board or bad ground somewhere.
How do I use the dvm to find a bad ground? Do I need to test every connection? Thanks
Quoted from MarAlb:The 2 big capacitors on the auxiliary power supply are often causing this.
Thanks.. great idea! GRUMPY stopped by & showed me how to spot electrolytics by seeing a "+" next to the part on the schematic.
Quoted from MarAlb:The 2 big capacitors on the auxiliary power supply are often causing this.
I changed the 2... 10,000 mfd & 25 v capacitors on the auxiliary board tonight but it didn't help at all. Any other ideas? Thank you. It's pretty loud and annoying.
Quoted from scampcamp:I changed the 2... 10,000 mfd & 25 v capacitors on the auxiliary board tonight but it didn't help at all. Any other ideas? Thank you. It's pretty loud and annoying.
Not really. Any change in the humming? Did the plated holes survive when removing the old snap in caps? Pretty easy to break them and when this happen you will loos continuity between top and bottom side of the circuitboard.
Are both speaker humming?
Quoted from MarAlb:Not really. Any change in the humming? Did the plated holes survive when removing the old snap in caps? Pretty easy to break them and when this happen you will loos continuity between top and bottom side of the circuitboard.
Are both speaker humming?
The capacitors came out & went in ok. The only hum is from the bottom under cabinet speaker...
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