Macintosh Portable

Hardware
The machine was architecturally similar to a fast Macintosh SE, using the 68HC000, a low-power version of the Motorola 68000, running at 16 megahertz on a 16 MHz bus. The Portable came with 1 megabyte (MB) of RAM soldered on the motherboard and was expandable to 5 MB using the single RAM expansion slot, or 9 MB using the single PDS expansion slot which, due to strict FCC regulations, was not developed for use with any other expansion cards such as the popular Ethernet card for the SE. It also had a single ROM expansion slot which would accommodate up to 4MB, though the Portable itself used a 256K ROM based on the SE's. Weighing in at 15.8 pounds (7.2 kilograms), due in large part to the sealed lead-acid batteries used, the machine was widely considered more of a "luggable" than a portable which, compared to the PowerBook series introduced a few years later, lacked the ergonomic layout that set the trend for all future laptops.
The Mac Portable had a standard 1.44 MB floppy disk drive, an optional internal hard disk (a low-power 3.5" drive from Conner was used) or second internal floppy drive, and also offered the first optional internal modem in a Macintosh. It additionally offered a full complement of standard-sized desktop peripheral ports, though the use of the internal modem disabled the external modem port. It even included stereo audio output, the only one ever included on a "68K" Mac. The modular, 'snap together' physical design of the Portable made it easy to upgrade, customize and repair in the field. Memory, modem and special-purpose circuit boards could be inserted in seconds without special tools, simply by opening the large panel that covered the back of the computer. Users could even move the trackball from the right to the left of the keyboard to accommodate left-handed users, or replace it with an optional numeric keypad.
Additionally, the Portable included many forward-thinking features which were rarely implemented, if ever taken advantage of. The Portable was capable of SCSI Disk Mode (first officially supported by Apple with the PowerBook 100) through a third-party kit, thus allowing it to be used as an external drive for a desktop Mac. It was also the first Mac with a self-contained display to include a built-in monitor output, requiring an external Video Adapter (which Apple canceled shortly after it was announced), something even the PowerBook line would not incorporate until its second-generation models. However, third-party developers did create products utilizing this output, including an overhead projector panel. It was also the first Mac to allow its display settings to be completely controlled by software, a feature that would later turn up in the Macintosh Classic desktop.
Perhaps the most prominent feature of the Portable (and the single item that contributed most significantly to its cost) was the much praised active matrix LCD, which provided a bright, sharp display comparable to a desktop Mac. Apple's use of the more expensive technology made it a standout from the PC portables which used inferior and cheaper passive-matrix displays.
Criticism
Unlike later portable computers from Apple and other manufacturers, the battery is charged in series with the supply of power to the computer. If the battery can no longer hold a charge, then the computer cannot run on AC power and hence it will not boot. The main reason for this is that the original power supply had a very low output. This is also why in many instances the hard drive would not spin up. Several popular unauthorized workarounds were devised, including to use the power supply from the PowerBook 100 Series which provides a higher output. Sealed lead acid cells tend to fail if they are fully discharged, another common complaint about the Portable. The batteries are no longer manufactured and it is very rare to find an original battery that will hold charge that will allow the computer to start. It is possible to repack the battery with new cells, or use alternative 6 V batteries. The sealed lead acid cells used in the Portable's battery pack were made by Gates and were also used in Quantum 1 battery packs for photographic flash use.
One of the drawbacks of the Portable was poor readability in low light situations. So in February 1991, Apple introduced a backlit Macintosh Portable (model M5126). Along with the new screen, Apple changed the SRAM memory to pseudo-SRAM (which reduced the total RAM expansion to 8MB) and lowered the price. The backlight feature was a welcomed improvement, but it came with a sacrifice: battery life was cut in half. An upgrade kit was also offered for the earlier model as well, which plugged into the ROM expansion slot. The Portable was discontinued in October of the same year.
In addition, at 16 pounds and 4 inches thick, the Portable was heavy and bulky as a portable computer. Lead-acid batteries contributed to its weight and bulk.
Legacy
The Macintosh Portable and PowerBook 100 can run Macintosh System 6.0.4 through System 7.5.5.
In May 2006, PC World rated the Macintosh Portable as the seventeenth worst tech product of all time.
References
^ Technical Note HW540: SCSI Port Q&As
^ a b PCWorld (2005-05-26). "The 25 Worst Tech Products of All Time". http://www.pcworld.com/article/id,125772-page,5-c,techindustrytrends/article.html. Retrieved 2006-07-18. 
External links
Mac Portable profile on Low End Mac
More pictures on this Mac Portable
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