From Apple-History.com

Announced in October 1993, the Duo 250 was exactly the same as the Duo 230, except it had a 4-bit active-matrix screen. It sold for $2,500 and was discontinued in May 1994.

Codename: Ansel
CPU: Motorola MC68030
CPU Speed: 33 MHz
Bus Speed: 33 MHz
Data Path: 32 bit
ROM: 1 MB
RAM Type: unique
Minimum RAM Speed: 70 ns
Onboard RAM: 4 MB
RAM Slots: 1
Maximum RAM: 24 MB
Level 1 Cache: 0.5 kB
Screen: 9" active matrix grayscale LCD
Maximum Resolution: 16 bit 640x400
Slots: Modem, Dock (152-pin PDS)
Hard Disk: 200 MB
Serial: 1
Speaker(s): mono 8 bit
Microphone: mono 8 bit
Gestalt ID: 38
Power: 25 Watts
Weight: 4.2 lbs.
Dimensions: 1.4" H x 10.9" W x 8.5" D
Minimum OS: 7.1
Maximum OS: 7.6.1
Introduced: October 1993
Terminated: May 1994