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Post by roscoe1017 on Jan 29, 2024 0:25:09 GMT
I have a rockola 496-2 that has a non-functioning controller. I have verified the EPROMs are bad and will not read. The EPROMs are labeled 54479-6 and 54479-7. I need the two ICs to repair this board and ideally would like the binary files so I can program my own parts. I have programmed and installed -3 and -4 software hoping they were merely revision changes but I think they are for another model. I only have a blurry schematic for documentation so I don’t have a parts list to verify part numbers
Any information or help would be greatly appreciated. Thanks, Ross
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Post by Hildegard on Jan 30, 2024 18:35:34 GMT
The numbers 54479-6 and 54479-7 are Rock-Ola part numbers. The parts list does not tell more about these except that they are already programmed.
The schematic gives this information for both: PROM 2764/2364 250ns 28 pin.
It seems this PROM is still available, but for binary files I don't know.
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Post by roscoe1017 on Jan 30, 2024 19:37:03 GMT
I found blank EPROMs and purchased extras. Now the hard part, finding the binary file to program the blanks. That the challenge
Regards, Ross
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Post by jukeboxmarty on Jan 30, 2024 21:08:26 GMT
I found blank EPROMs and purchased extras. Now the hard part, finding the binary file to program the blanks. That the challenge Regards, Ross
If you had some known working EPROMs couldn't you read them out into a file?
I'm also under the impression that EPROMs for these boards rarely go bad, so buying an untested controller may yield good parts... maybe!
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Post by jukenorman on Jan 30, 2024 22:46:17 GMT
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Post by roscoe1017 on Feb 17, 2024 12:05:15 GMT
I got my system 3 control unit repaired now I need the manual that describes its functions. There is quite a lot of info on the system 2 controller but info in sys 3 controllers seem elusive
Thanks. Ross
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Post by Hildegard on Feb 27, 2024 16:00:56 GMT
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