Yamaha TX802 firmware OS Upgrade Version 1.5 – Final Revision
This is firmware revision 1.5 and is the latest official released operation system by Yamaha. This operation system update/upgrade requires one eprom chip as revealed in the article`s photos and the chip will be labeled to help you locate the correct chip socket. For more info, please check below.
The OS v1.5 upgrade provides bug fixes related to midi communication and system code issues.
The eprom is in socket, so you swap the current chip located at IC 6 with this one.