PowerBook Duo 230

The PowerBook Duo 230 was a subnotebook from the PowerBook Duo line that was introduced by Apple Computer on October 19, 1992.

Features
The Duo 230 featured a 33 MHz Motorola 68030 processor and a 640x400 4-bit grayscale display, with improved contrast over standard  screens. The logic board contained 4 MB of RAM which could be upgraded to 24 MB. It was compatible with all Duo Dock models.

It shipped with System 7.1 (with System Enabler 201) and could be upgraded to Mac OS 7.6.1.

Upgrade path
Owners of the Duo 230 or other 68k-based models could upgrade to a 100 MHz PowerPC 603e processor with the PowerBook Duo 2300 upgrade kit.