PowerBook 145B PowerBook 145B

Macintosh PowerBook 145B Datasheet

In the fast-paced world of technology, products come and go, but some leave an indelible mark on the industry. One such device was the Apple Macintosh PowerBook 145B, a notebook computer that emerged in the early 90s.

Although it had a short lifespan, this portable machine captured the hearts of many Macintosh enthusiasts and played a significant role in shaping the trajectory of Apple’s future products. Today, as we commemorate its 30-year anniversary, let’s take a nostalgic journey back to the era when the PowerBook 145B reigned supreme.

On June 7, 1993, Apple unveiled the PowerBook 145B, a member of the esteemed Macintosh PowerBook series. Priced at $1,150, this compact notebook aimed to provide users with a reliable computing experience on the go.

Equipped with a 25 MHz Motorola 68030 processor, 4 MB of RAM, and a choice of either a 40 MB or 80 MB hard drive, it was a capable machine for its time. The 9.8″ monochrome LCD display and the standard 1.44 MB floppy drive completed the package, catering to the needs of users in an era dominated by monochrome displays and floppy disks.

Although the PowerBook 145B had a relatively short lifespan, lasting only a year before being discontinued on July 18, 1994, its impact was far from forgettable. Macintosh users in the early 90s relied on this machine for its stability and dependability. The 25 MHz 68030 processor, coupled with the ample onboard RAM, ensured smooth multitasking and efficient performance. Apple had successfully created a portable workhorse that could handle the demands of the era’s productivity tasks with ease.

The PowerBook 145B succeeded the PowerBook 145 and introduced a few noteworthy changes. Apple aimed to optimize production costs without compromising performance. One notable alteration was the increase in onboard RAM from 2 MB to 4 MB. While this may seem modest by today’s standards, it made a noticeable difference in enhancing the machine’s capabilities. The PowerBook 145B retained the features that made its predecessor popular while offering improved value to consumers.

While the PowerBook 145B may not have had a long run, it paved the way for future iterations in the PowerBook series. The 145B’s legacy was carried forward by its successor, the 33 MHz PowerBook 150, which arrived on the scene in mid-1994. Building on the success of its predecessors, the PowerBook 150 continued to refine the formula, offering enhanced performance and features that catered to the evolving needs of users.

30 years have passed since the Macintosh PowerBook 145B made its debut, and it remains a symbol of Apple’s commitment to innovation and excellence. Despite its relatively short existence, the PowerBook 145B proved to be a solid and reliable companion for many Macintosh enthusiasts of the early 90s.

While technological advancements have rendered it obsolete, its impact on the industry and the memories it created are far from forgotten. As we celebrate its anniversary, let us acknowledge the PowerBook 145B’s place in the annals of technological history and recognize its contributions to the world of portable computing.

Mac PowerBook 145B
Source: oldcrap.org – Mac PowerBook 145B

Macintosh PowerBook 145B Details

IntroducedJune 7, 1993
DiscontinuedJuly 18, 1994
Model Identifier54
Model NumberM1592LL/A
Original Price$1,150
Weight6.8 Ibs.
3.084 KG
Dimensions2.25” H x 11.25” W x 9.3” D
5.71 cm H x 28.57 cm W x 23.62 cm D

PowerBook 145B Tech Specs


ProcessorMotorola 68030
Processor Speed25 MHz
Number of Cores1
System Bus25 MHz
Cache0.5 KB L1

Storage & Media

Storage40 MB
80 MB
Media1.44 MB floppy


Built-in Memory4 MB
Maximum Memory8 MB
Memory Slots1 – PowerBook 1xx (70-pin connector)
Minimum Speed100 ns
Interleaving SupportNo


Built-in Display9.8″ diagonal passive-matrix reflective LCD
Resolutions640 x 400


Graphics CardNone
Graphics MemoryNone
Display ConnectionNone


Expansion SlotsInternal 20-pin connector for the optional 2400-baud modem card
Hard Drive Interface40-pin SCSI


Floppy PortNone
Audio In1 – 3.5-mm analog input jack
1 – Built-in microphone
Audio Out1 – 3.5-mm analog output jack
1 – Built-in speaker

Keyboard and trackpad

KeyboardBuilt-in 64-key (U.S.) or 64-key (ISO) 3.0-mm travel keyboard
TrackpadBuilt-in 25-mm trackball pointing device


Original OSSystem Software 7.1
Maximum OSMac OS 7.6.1
FirmwareMacintosh ROM


System Battery2.5-ampere-hour NiCad battery
Backup Battery3 V lithium
Maximum Continuous Power17 W
Line VoltageUnknown
Power AdapterUnknown

Further Reading and References