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Hcard-701 (Yamaha DX7 MKI) |Compatibility|Order

DX7 OS Version History:

Yamaha manufactured DX7 from 1983 to 1989. During this time, Yamaha gradually upgraded DX7 operating system from initial version 1.0 to v1.8. There are 6 different official OS versions for DX7. "Hcard-701" functionality has been tested under 4 different versions. We did not have chance to find the other versions because over 160,000 of DX7 MKI were made by Yamaha and OS revisions are installed semi-randomly among different batches. We suggest all customers to upgrade their DX7 OS ROM chip to the latest version 1.8. The previous versions suffer from several critical MIDI related bugs. Unfortunately there is no reference that clearly classifies DX7 version history. The items in following list have been gathered based on several official and non-official resources. If you purchased "Hcard-701", please send us your feedback and mention your OS version.

OS Version Hcard-701 Compatibilty ROM Chip Part Number Serial# Range Version in Test Menu Release Date
v1.0 Not Tested IG175700 + IG175750 001001-002660 -- 1983
v1.1 OK IG114610 002661-024880
Blank --
v1.x * OK IG114640 024881-025124
M1.0-1.6 1984
v1.7 Not Tested IG114670 099594-110585
-- --
v1.8 OK IG114680 110586-111085
M1.0-1.8 24-Oct-85 Oct 1985
v1.8 OK IG114680 131600-UP M1.0-1.8 24-Oct-85 Oct 1985
SER OK -- -- DX7 special v1.0 --

* v1.x mentioned as 1.4, 1.5 and 1.6 (must be confirmed)

How to find my DX7 OS version number?

For this purpose you must enter "DX7 Test Mode". To enter "Test Mode", while holding down function button, press button 16 then 32. The display will show a term like this "M1.0-1.8" that "M1.0" stands for MIDI version 1.0 and 1.8 stands for OS version.

Is Hcard-701 compatible with Yamaha DX5 or DX1?

No, Hcard-701 is not compatible. But we are developing a cartridge pair called "Hcard-705" which is specially designed to save/load the voice and performance of Yamaha DX5/DX1.


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