Yamaha RM1X version 1.13 firmware OS update EPROM.
This is firmware update 1.13 and is the latest official released operation system by Yamaha. This operation system update/upgrade requires one eprom chips as revealed in the article`s photos and the chips will be labeled to help you locate the correct chip socket. For more info, please check below.
Most RM1X has only version 1.12 installed and you can check the current OS by holding [UTILITY], [PATTERN] and [PATT CHAIN] buttons, while powering up the device.
Resolves issues such as midi filters and pattern changes delay and other MIDI related problems
Note:Fully verified before shipping and professionally packaged in anti-static material. The Yamaha RM1X on the picture is not for sale :) The IC socket is located at IC2