The Macintosh Portable is a notebook computer designed, manufactured and sold by Apple Computer, Inc. from September 1989 to October 1991. This is the first battery-powered Macintosh that is receiving much enthusiasm from critics, but sales to customers are rather low. It featured a fast, accurate, and cost-effective, fast-matrix black-and-white LCD display in an articulated design that covered the keyboard when the machine was not in use. The notebook was one of the first consumer notebooks to use an active matrix panel, and only the most expensive of the original PowerBook range, the PowerBook 170, used one, because of the high cost. The cursor pointing function was managed by a built-in trackball that could be removed and located on either side of the keyboard. He used expensive SRAM to maximize battery life and provide an “instant”, low-power, sleep mode. The machine has been designed to perform at the price and weight.
Unlike later laptops from Apple and other manufacturers, the battery is charged in series with the power of the computer. If the battery can no longer hold a charge, the computer can not run on AC power and therefore it will not start. The main reason for this is that the original feed has had a very low yield. This is also why, in many cases, the special low-power hard drive does not turn off. Several popular unauthorized workarounds have been designed, including to use the PowerBook 100 series power supply which provides higher output. As with automotive batteries, the sealed lead acid cells used in the notebook failed if they were completely discharged. Batteries are no longer manufactured and it is very rare to find an original battery that will charge and allow the computer to boot. It is possible to repack the battery with new batteries or use alternative 6V batteries. There were three lead-acid cells inside the battery; Each of them has been manufactured by Gates Energy Products (now EnerSys) and has also been used in Quantum 1 battery packs for photographic use. Despite the dramatic improvement in ergonomics provided by the responsiveness, sharpness and uniformity of its active matrix panel, one of the disadvantages of the Notebook was poor readability in low light situations. Therefore, in February 1991, Apple introduced a backlit portable Macintosh (model M5126). With the new display, Apple changed SRAM memory to less expensive and more energy-hungry pseudo-SRAM (which reduced total RAM expansion to 8 MB) and lowered the price. The backlight function was a welcome improvement, but unfortunately it reduced the battery life by about half. An upgrade kit was also proposed for the previous model, which was plugged into the ROM expansion slot. The laptop was shut down in October 1991. In addition, at 16 pounds (7.2 kilograms) and 4 inches (10 centimeters) thick, the notebook was a heavy and bulky laptop. The main contributor to the weight and volume of the Notebook was lead-acid batteries.
Three drive configurations were available for the Portable Macintosh: a floppy disk drive, two floppy disk drives, or a hard drive and a floppy disk drive. The floppy drive in the Portable Macintosh is 1.44 MB. Most portable Macintosh units come with a hard drive. It was a custom designed Conner CP-3045 (known by Apple as “Hard Disk 40SC”). It contains 40 MB of data, consumes less power compared to most hard drives at the time and has a proprietary SCSI connector; Adapters that allow the use of standard SCSI drives on the laptop exist, but they are expensive.
Macintosh Portable and PowerBook 100 can run Macintosh System 6.0.4 to System 7.5.5. In May 2006, PC World ranked the Macintosh Portable as the seventeenth-leading technology product of all time. In contrast, MacUser magazine noted that this machine tended to remain relevant and therefore tended to have a long life for those who bought it, reducing its total cost of ownership.
* Outgoing laptop, a Mac compatible laptop available at the same time as the laptop. It was significantly smaller, cheaper and lighter, but offered a much less responsive STN “twist” LCD display and a less ergonomic pointing device. It was also limited to 4 MB of RAM, because of its requirement for users to install a ROM chip from an Apple machine such as Macintosh Plus.