
It's important to note that EPROM sizes may differ from one JX-10 to another.
This can be attributed to the year of manufacture and in some cases, a Roland Authorized
Service Center has installed updated EPROM's which replaced the factory originals.

The binary files in this *.ZIP file for ROM-B and ROM-C are for use with 64K EPROM's.

My JX-10 has 64K EPROM's for ROM-B and ROM-C. They are P/N: MBM2764-25 manufactured by Fujitsu.

The binary file in this *.ZIP file for ROM-A is for use with a 256K EPROM. It is P/N: TC57256D-20 manufactured by Toshiba.


Other JX-10 owners have reported finding 128K and 256K EPROM's for ROM-B and ROM-C.
These EPROM's contain the identical code contained on the 64K EPROM's.
However, for a 128K EPROM, it is copied twice... one on top of another.
Likewise, for a 256K EPROM, it is copied four times... one on top of another.
This is done to fill up the empty space and make the EPROM function correctly.
