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PowerBook Buyer's Guide
PowerBook Duo 250
by Steve Hildreth
The 250 was the first Duo with an active-matrix screen displaying 16 levels of gray. It has a bright display with a larger hard drive than the 210 and 230, but is otherwise identical to the 230. The active-matrix screen makes this laptop a better buy than the 230, but it is also a little more expensive, harder to find, and uses a bit more juice while away from a power source. I'd recommend this machine to someone who doesn't necessarily care about a color display, but needs something brighter than what a passive-matrix screen offers. Thanks to Daniel Davis for the photo.
Rating
At the time: B
Ports
1 serial
internal modem
processor direct slot (PDS) for dock or floppy drive
Display
Active-matrix 16-level grayscale
9"
640x400 resolution
Weight
4.2 pounds
Apple's Specifications:
| Logic Board |
Ports |
Power |
| Processor: |
68030, 33 MHz |
| PMMU: |
integrated |
| FPU: |
opt. in Dock |
| Data Path: |
32-bit, 33 MHz |
| L1 Cache: |
0.5K |
| L2 Cache: |
none |
| 2nd Processor: |
none |
| Slots: |
modem, dock |
|
| ADB: |
none |
| Video: |
none |
| Floppy: |
none |
| SCSI: |
none |
| Geoports: |
none |
| Ethernet: |
none |
| FireWire: |
|
| Mic Type: |
none |
| Other Ports: |
Printer, |
|
| Max Watts: |
25 |
| Amps: |
1.04 |
| BTU per Hr: |
85.5 |
| Voltage: |
100-240 |
| Freq Range: |
50-60 Hz |
| Battery Type: |
Duo, NiMH Type II |
| Soft Power: |
yes |
|
| Memory |
Video Memory |
| Logic Board: |
4 MB |
| RAM Slots: |
1, Duo |
| Min - Max RAM: |
4 MB - 24 MB |
| Min RAM Speed: |
70 ns |
| RAM Sizes: |
4-20 MB |
| Install in Groups of: |
1 |
|
| Resolution |
Video Memory
built-in LCD screen
(built in) |
| 512 x 384 |
n/a-bit |
| 640 x 400 |
4-bit |
| 640 x 480 |
n/a-bit |
| 800 x 600 |
n/a-bit |
| 832 x 624 |
n/a-bit |
| 1024 x 768 |
n/a-bit |
| 1152 x 870 |
n/a-bit |
| 1280 x 1024 |
n/a-bit |
|
| Physical |
Software |
Storage |
| Introduced: |
10/21/1993 |
| Discontinued: |
5/1/1994 |
| Form Factor: |
PowerBook Duo |
| Gestalt ID: |
38 |
| Weight (lbs): |
4.2 |
| Dimensions (in): |
1.4 H x 10.9 W x 8.5 D |
|
|
|
| Addressing Modes: |
24-, 32-bit |
| Orig SSW: |
7.1 |
| Orig Enabler: |
PowerBook Duo Enabler v1.0 |
| ROM ID: |
$067C |
| ROM Ver: |
n/a |
| ROM Size: |
1MB |
| AppleTalk Ver: |
57.0.4 |
Mac OS
Supported: |
7.1
7.5
7.1.1 (Pro)
7.5.1
7.5.3
7.5.5
7.6
7.6.1 |
|
| Floppy Size: |
none |
| Floppy Inject: |
n/a |
| Min. Int HD Size: |
200MB |
| Int HD Interface: |
SCSI |
| Orig CD Speed |
n/a |
| Int CD Support: |
|
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