Apple · PowerBook

Macintosh PowerBook Duo 250

Released 1993

A dockable monochrome PowerBook with a 33 MHz 68030 processor, an active-matrix greyscale display and a 200 MB SCSI hard drive.

Specifications

Screen size: 9″
Resolution: 640 × 400
Touchscreen: No
Display type: Backlit active-matrix LCD with 16 grey levels. Apple's product description and technical table specify a 9-inch diagonal; the developer note gives a 192 × 120 mm active pixel area

Processor: Motorola 68030 33 MHz (PowerBook 165)
CPU cores: 1
Memory: 4 MB or 12 MB
Storage: 200 MB
CPU: Motorola 68030 at 33 MHz, with integrated memory-management unit; no built-in floating-point coprocessor. An optional dock provides a maths coprocessor
Memory type: 4 MB on the logic board and one Duo expansion-card slot; maximum 24 MB. Apple kits expand to 8 or 12 MB; larger capacities require third-party cards
Storage type: Internal 200 MB SCSI drive in Apple's 4/200 and 12/200 ordering configurations. The developer note mentions a 120 MB option without an ordering configuration. External floppy drive requires a Duo Floppy Adapter or MiniDock

Battery life (maker's claim): Up to 6 hours
Weight: 1.9 kg
Thickness: 36 mm
Width × depth: 277 × 216 mm
Battery life detail: Removable Type II nickel-metal hydride battery; Apple's technical table claims 2.5–6 hours. Its later developer-note feature list and block diagram contain conflicting battery, colour-display and memory claims; the exact model's technical table controls these specifications

Operating system: macOS
Port detail: RS-422 serial/LocalTalk, 152-pin docking connector, power input and optional internal fax/data modem. External video, SCSI and floppy connections require docking accessories
External displays: Optional PowerBook Duo Dock or Duo MiniDock provides external video and desktop connections
Keyboard: Built-in keyboard with two-level tilt adjustment and Caps Lock indicator
Trackpad: 19 mm trackball with two buttons
Speakers: Built-in speaker; 8-bit monophonic sound input/output at 11 or 22 kHz
Microphones: Built-in omnidirectional electret microphone, documented in the exact-model technical table despite the support summary's Mic Type none
In the box: Computer, battery, AC adapter, System 7.1 software and documentation. The 12/200 configuration adds an internal Express Modem. Maker introduction was 21 October 1993; The Mac December 1993 current buying guide confirms retail presence that year without an exact first-sale month

Processor	Memory	Storage
Motorola 68030 33 MHz (PowerBook 165)	4 MB	200 MB
Motorola 68030 33 MHz (PowerBook 165)	12 MB	200 MB

Model	Size	Display	Processor	Memory	Weight	Battery	Released
AppleMacintosh PowerBook Duo 210	9″	–	Motorola 68030 25 MHz (PowerBook 145B)	4 MB	1.9 kg	4.5 h	Oct 1992
AppleMacintosh PowerBook Duo 230	9″	–	Motorola 68030 33 MHz (PowerBook 165)	4 MB	1.9 kg	4.5 h	Oct 1992
AppleMacintosh PowerBook Duo 280	9″	–	Motorola 68LC040 66 MHz (PowerBook 540c)	4 MB – 12 MB	1.9 kg	4 h	1994