Sony HBI-55
This page was last modified 09:51, 27 January 2022 by Gdx. Based on work by Mars2000you and Rderooy and others.



The Sony HBI-55 is a data cartridge identical to the UDC-01 from Yamaha. It is used to store the data of the Personal Databank software that comes with the following Sony computers:

The Personal Databank software is provided on tape for the HB-501 while it's built-in for all the other mentioned machines.

The HBI-55 cartridge was included with the HB-55 and HB-75 computers.

The data is saved on a 4kB SRAM (Static RAM) and a small battery preserves the data when the computer is off.

A small BASIC program can also be saved onto this cartridge with the instruction SAVE"CAT:" when you select BASIC + DATA CARTRIDGE in the firmware menu, and you can load it from the cartridge, with LOAD"CAT:".

It works with 64kB RAM. So you need an expansion memory to use these instructions on the HB-55.

Brand Sony
Model HBI-55
Year 1984
Region JP, Europe
Launch price DE: 128 DM
JP: ¥9,800
Package content HBI-50 cartridge
Operating instructions
Emulation emulated


Sony HBI-55 box
Sony HBI-55 box, cartridge and manual
Sony HBI-55 cartridge
Sony HBI-55 PCB
Sony HBI-55 PCB underside
Sony HBI-55 box, cartridge and manual


The HBI-55 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 by soldering 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.

External links