PowerBook 5300
Dan Knight - 1998.12.04
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Second Class Macs are Apple's more compromised hardware designs. For the most part, they're not really bad - simply designs unable to work as well as they should have.
The PB 5300 was Apple's first PowerPC-based PowerBook.
Originally designed to use LithIon batteries, Apple recalled the 5300
after some of the new batteries burst into flames. Not only was this an
embarrassment to Apple, but the PowerBook 5300 became the butt of many
jokes.
Switching to NiMH batteries solved the problem, but then there was the motherboard to address. A problem with the Sleep setting didn't reduce power sufficiently, reducing the maximum time in sleep mode from over a week to about four days.
On top of that, the power supply wasn't robust enough to handle everything you could put into the expansion bay. And the connector on the AC adapter could break, making it impossible to charge the batteries - or run the computer.
And as if that weren't enough, the 5300 and it's 68040-sibling, the PowerBook 190, had problems with the case, especially the hinge between the main computer and the screen. Flecks of dark gray plastic were soon called PowerBook droppings. Over time, enough plastic would be lost that the 5300 needed to go in for service. (Thank you, Apple, for a seven year warranty on this repair!)
Some of the system bugs were solved simply by upgrading from System 7.5.2, which shipped with the computer, to 7.5.3 or later. Reports are that the 5300 is rock solid under Mac OS 8.0 and later. Also, the improved emulation of Speed Doubler really helps performance of the pedestrian IDE hard drive.
Apple had hoped to design a PowerBook around the PowerPC 603 processor, but soon discovered that the on-chip cache (level 1 cache) was inadequate for decent 680X0 emulation used with older software. The 603e doubled the size of the L1 cache, making it a much better performer with old software. (See Macintosh CPUs, Part 2, for more details on the 603 and other PowerPC chips.)
But Apple made a serious design compromise by designing the 5300
with no level 2 cache - and no way of adding one. Even a relatively
small 256 KB L2 cache can boost performance on the order of 30%.
Without that cache, the 5300 was slower than anyone expected a 100 MHz
or 117 MHz machine to be. (Another blow to the already soiled
reputation of the 603.) 
Details
- introduced 1995
- requires System 7.1.1 or later
- CPU: 100 or 117 MHz PPC 603e
- ROM: 2 MB
- RAM: 8-32 MB, expandable to 64 MB
- displays:
- 640 x 480 9.5" grayscale active matrix with 16 shades
- 640 x 480 10.4" color dual scan with 16-bit color
- 640 x 480 10.4" color active matrix with 16-bit color
- 500 MB, 750 MB, or 1.1 GB hard drive standard
- ADB: 1 port for keyboard and mouse
- serial: 1 DIN-8 RS-422 port on back of computer
- PC Card slots: 2
- SCSI: HDI30 connector on back of computer
- weight: 6.1-6.4 pounds
Other Resources
- The 10 worst Macs ever built, Remy Davison, Insanely Great Mac, 2001.08.06
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