Apple Macintosh PowerBook Duo 270c vs Apple Macintosh PowerBook Duo 280c

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Macintosh PowerBook Duo 270c compared with Macintosh PowerBook Duo 280c

	AppleMacintosh PowerBook Duo 270c	AppleMacintosh PowerBook Duo 280c
Overview
Released
Released	1993	May 1994
Display
Screen size
Screen size	8.4″	8.4″
Resolution
Resolution	640 × 480	640 × 480
Touchscreen
Touchscreen	No	No
Display type
Display type	Backlit active-matrix TFT colour LCD; 256 colours at 640 × 480 or thousands at 640 × 400. Apple's exact-model product description gives 8.4 inches; the later service table labels this model 9 inches	8.4-inch backlit active-matrix colour LCD; 256 colours at 640 × 480 or thousands of colours at 640 × 400
Screen finish
Screen finish	Antiglare polariser	–
Performance
Processor
Processor	Motorola 68030 33 MHz	Motorola 68LC040 66 MHz (PowerBook 540c)
CPU cores
CPU cores	1	1
Memory
Memory	4 MB or 12 MB (better)	4 MB
Storage
Storage	240 MB	320 MB (better)
CPU
CPU	Motorola 68030 at 33 MHz with an integrated memory-management unit and a separate Motorola 68882 maths coprocessor at 33 MHz	Motorola 68LC040 with 66 MHz internal processor speed and 33 MHz bus interface; integrated memory management without an FPU
GPU
GPU	Colour Screen Controller with video RAM; selecting thousands of colours centres a 640 × 400 image with black bands above and below	–
Memory type
Memory type	4 MB soldered on the logic board, with one Duo expansion-card slot; maximum 32 MB. Apple memory kits expand to 8 or 12 MB; larger capacities require third-party cards	4 MB fitted, expandable to 8 or 12 MB with Apple's memory kits and up to 40 MB using third-party cards
Storage type
Storage type	Internal 240 MB SCSI hard drive in the two configurations listed in Apple's product description. The developer note also describes a 160 MB option, without an ordering configuration. External 1.4 MB floppy drive requires a Duo Floppy Adapter or Duo MiniDock	320 MB internal SCSI hard drive; optional external 1.4 MB Apple SuperDrive through a floppy adapter or dock
Battery and size
Battery life (maker's claim)
Battery life (maker's claim)	Up to 4 hours	Up to 4 hours
Weight
Weight	2.1 kg	2.1 kg
Thickness
Thickness	38 mm	38 mm
Width × depth
Width × depth	277 × 216 mm	277 × 216 mm
Battery life detail
Battery life detail	Removable Type II nickel-metal hydride battery. Apple's product description claims 2–4 hours; the developer note claims 4.5 hours, while the later service manual gives approximately 2–3 hours. Service weight is 2.1 kg with a battery; its paired 4.8 lb figure is inconsistent. Dimensions are rounded from Apple's 10.9 × 8.5 × 1.5 inch support table; the service manual swaps width/depth and pairs 1.5 inches with 36 mm	Removable high-capacity Type III nickel-metal hydride battery; Apple claims 2–4 hours. Maker TIL gives 2.1 kg and 4.8 lb together; the stated metric weight is retained without converting the inconsistent pounds figure
Charger
Charger	AC adapter supplied; service manual gives a 24 V DC, 1.04 A output	–
Connections
Operating system
Operating system	macOS	macOS
Port detail
Port detail	152-pin docking connector, RS-422 serial/LocalTalk mini-DIN-8 port, power input and optional internal Express Modem. Additional video, SCSI and floppy connections require docking accessories	152-pin docking connector, RS-422 serial/LocalTalk, power input and optional internal 14,400 bps fax/data modem; ADB, SCSI, video and floppy connections available through compatible docks
External displays
External displays	Optional PowerBook Duo Dock or Duo MiniDock provides external video and desktop peripheral expansion	Video output through an optional Duo Dock, Duo Dock II or Duo MiniDock
Keyboard
Keyboard	Built-in keyboard with two-level tilt adjustment; 63 keys on the domestic version or 64 on the ISO version	–
Trackpad
Trackpad	19 mm trackball with two buttons	19 mm trackball with two buttons
Speakers
Speakers	Four-voice, 8-bit monophonic sound input and output at 11 or 22 kHz	Built-in mono speaker and omnidirectional microphone; 8-bit sound input at 11 or 22 kHz
Microphones
Microphones	Built-in omnidirectional electret microphone; the support summary's Mic Type none does not describe the built-in microphone documented in the developer and service manuals	–
In the box
In the box	Computer, battery, AC adapter, System 7.1 software and documentation; desktop docks sold separately. Apple lists introduction on 21 October 1993. The Mac December 1993 buying guide lists the model in the current retail range with a UK basic price; no exact first-sale month is established, so release precision remains the year	Notebook with 4 MB RAM and 320 MB storage; desktop docking hardware and external floppy drive sold separately