Super Snapshot V4 Cart. Problem

[gp_guy]

Hi Group,

I got a Super Snapshot V4 cartridge in a box of Commodore stuff at a garage sale. Great! But, when I plugged it in, all I get is a black screen. So, does anyone know of a way to redeem this cart? Stuff I tried was to clean the surface of the plug-in (forgot what the heck that is called), cleaned the toggle switch and push button switch with De-Oxit contact cleaner, and re-seated the rom chip. Still, just get a black screen. I guess I've been fortunate in that I've only had three carts out of about fifty that I couldn't use...

Regards,

Rob

 

[roy_bates]

maybe the rom on board has gone blank or possibly a electrical fault

not sure if you actually tested any switch to see if it was working or did any sort diagnostics

 

[gp_guy]

Hi Roy,

Thanks for replying. I didn't actually check continuity of either switch to see if they were functional. I can easily do that. But, what other diagnostics can I perform?

Rob

 

[roy_bates]

you remove the rom and read it out on a programmer,not sure if you have a programmer or know where to get an image thats on this cart though


any logic on the board would of course mean looking at datasheets and truth tables

 

[gp_guy]

I don't have a programmer or a way to get the rom image burned on to another chip. So, that probably means this cartridge is added to my parts bin. Thanks anyway Roy!

Rob

 

[kalidomra]

Did you ever get this working? Looking at the schematic for the super snapshot 5 (not sure if it is the same), it could also be a PLA problem.

 

[gp_guy]

Hi kalidomra, I did get it working with eslapion's help. I think he found a bad chip in the cart. Thanks for replying...