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Hcard-702 (Yamaha DX7II-D/FD) |Compatibility|Order

DX7II OS Version History:

Yamaha manufactured DX7II from 1986 to 1989. During this time, Yamaha gradually upgraded DX7II operating system from initial version 1.1 to v1.9. There are 7 different official OS versions for DX7II. "Hcard-702" functionality has been tested under 5 different versions. We did not have chance to find the other versions because over 70,000 of DX7II were made by Yamaha and OS revisions are installed semi-randomly among different batches. We suggest all customers to upgrade their DX7II OS ROM chip to the latest version 1.9. Unfortunately there is no reference that clearly classifies DX7II version history. The items in following list have been gathered based on several official and non-official resources. If you purchased "Hcard-702", please send us your feedback and mention your OS version.

OS Version Hcard-702 Compatibilty ROM Chip Part Number Serial# Range Release Date
v1.1 OK -- -- 12-1986
v1.2 Not Tested -- -- --
v1.3 OK -- -- 01-1987
v1.5 Not Tested -- -- --
v1.6 OK XC314D0 -- 04-1987
v1.8 OK XC314006 Service Use 12-1987
v1.9 OK XC314007 Service Use 07-1988


How to find my DX7II-D/FD OS version number?

For this purpose you must enter "DX7II Test Mode". To enter "Test Mode", while holding down edit button, press button 16 then 32. The display will show the OS version and release date.

How to upgrade DX7II OS to the latest version?

You need to ask a technician to open your device, and replace the ROM chip.

Is Hcard-702 compatible with Yamaha TX-802 Rack?

TBD.

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