Yamaha UDC-01
This page was last modified 14:54, 27 December 2022 by Mars2000you. Based on work by Gdx and Rderooy and others.



The Yamaha UDC-01 Data Memory is a data cartridge identical to the Sony HBI-55. It is used to store the data of your SFG musical creations when using most of the software released for this soundchip. It's especially conceived for the following Yamaha computers, as they have built-in the SFG module:

The data are saved onto 4kB SRAM (Static RAM) and a little battery preserves it when the computer is off.

Brand Yamaha
Model UDC-01
Year 1984
Region JP, Europe
Launch price JP: ¥9,800
NL: ƒ 315
Package content
Emulation Not emulated, but identical to the Sony HBI-55 which is.


Yamaha UDC-01 box
Yamaha UDC-01 cartridge


The UDC-01 has a non-rechargeable battery, without it the SRAM will not keep the contents when the system is switched off. This coin cell battery can be replaced, you need to open the cartridge and replace the battery with a new one (type: CR2032 or BR2032 Lithium 3V). Confirmation is needed about battery pins type. Be careful not to overheat the battery when soldering it, and put on safety glasses because of the risk of explosion with heat.

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