SCSI isn’t the black art it sometimes seems to be, but the various terms different people use for the same thing makes it tough to sort out. I hope the following lessens the confusion.
Hard drive capacity is limited not only by how densely bits can be packed on a magnetic platter, but also by the number of sectors and tracks and drive surfaces in the drive itself and the number the computer’s operating system is designed to handle.
1999 – I have a Performa 6400 and am looking to upgrade my hard drive. I do not want to buy an external drive. Should I upgrade the IDE hard drive or add a SCSI drive to the bay above the CD-ROM?
The 1999 version of the PowerBook G3 (a.k.a. Bronze Keyboard and Lombard) was announced on 1999.05.10 and reached stores by the end of the month. At nearly two pounds lighter and 20% thinner than the PowerBook G3 Series, toting Lombard was easier than any PowerBook since the 4.4 lb. 2400.
This PowerBook G3 Series II, code named PDQ, was announced Sept. 1, 1998. Changes from the earlier G3 Series include a 66 MHz motherboard for all versions and standard 14.1″ screen. The 1024 x 768 screen will also automatically scale, allowing users to emulate 640 x 480 and 800 x 600 resolutions.
The article on SCSI Component Order generated some excellent feedback and dialogue. The following comments were written by Keith Bumgarner of MacInformed, the author of the original article.
Per a few private requests, I found enough interest to post a thesis for all to see about the SCSI ID 5 issue.
The PowerBook G3 Series, code named WallStreet, was designed around the same PowerPC 750 (aka G3) processor as the original PowerBook G3 – but don’t confuse it with the original. Although they bear a similar name, this was a whole new computer. Available at three different speeds (233, 250, and 292 MHz) and with three […]
Sometimes getting a SCSI chain working properly seems to be more hit and miss than science. We know the last device should be terminated, that the chain should not exceed a certain length, and that every device must have a unique ID. But even that isn’t enough to consistently build a busy SCSI chain and […]
Apple popularized SCSI (small computer system interface) by making it a standard feature on the third Macintosh, the Mac Plus, which was introduced in January 1986. Although Apple only embraced a subset of the emerging SCSI standard, the new bus allowed chaining up to seven peripherals to the computer. The 8-bit parallel interface was theoretically […]
1997 – Surprising to many, the first Macs didn’t have SCSI. The Apple design team created a compact, closed box with a disk drive, CPU, monitor, 128 KB of RAM, keyboard and mouse ports, a floppy drive port, and two serial ports. The serial ports were the secret – they could support a 230.4 Kbps […]
First available in Canada (1993), and then Asia and Europe (and never sold in the home US market), the Colour Classic II (also known as the Performa 275) shares the motherboard design of the LC III. Running at a relatively fast 33 MHz, memory can be expanded as far as 36 MB.
At 33 MHz, the LC III+ (also known as the Performa 460) was the fastest 68030-based computer in the LC series.
“With double its predecessor’s speed and more than triple the RAM capacity, the LC III is a significant entry into the low end of Apple’s line.” MacUser, April 1993
The end of the Classic line in the North American market, the Color Classic (a.k.a. Performa 250) shared the motherboard design of the LC II – equally limited in RAM expansion, constricted by a 16-bit data bus, and able to use 16-bit PDS cards designed for the LC. The only significant difference is the presence […]
The Mac IIvx was an okay computer, but a big “Huh?” for Mac IIci users. Where the LC and LC II had been compromised by using a 32-bit processor on a 16-bit data bus, the IIvx ran a 32 MHz CPU on a 16 MHz bus. This gave it slower performance than the IIci, which […]
The Mac IIvi is a slower version of the Mac IIvx, running a 16 MHz 68030 CPU on a 16 MHz bus. The IIvi was never sold in the United States. Unlike the IIvx, the IIvi cannot accept a level 2 (L2) cache, although it can accept an accelerator.
The Performa 600 was an okay computer, but a big “Huh?” for Mac IIci users. Where the LC and LC II had been compromised by using a 32-bit processor on a 16-bit data bus, the Performa 600 ran a 32 MHz CPU on a 16 MHz bus. This gave it slower performance than the 25 […]
What was the smallest desktop Mac prior to the Mac mini? Apple’s LC series, which measured just under 3″ tall, although it had as big a footprint as four minis.
Introduced in October 1991, the Classic II (a.k.a. Performa 200) was both an upgraded Classic and a replacement for the venerable SE/30. Based on a modified LC motherboard, the Classic II shares a 16-bit data path and a RAM ceiling of 10 MB (the Classic II is slower than the SE/30, even though both use […]
What was the smallest desktop Mac prior to the Mac mini? Apple’s LC series, which measures just under 3″ tall, although it has as big a footprint as four minis. The Mac LC, introduced in October 1990, was the first of the family.
The IIsi shares some features with the SE/30, some with the LC series, and some with the Mac II series. Like the SE/30, it has a 68030 PDS (Processor Direct Slot) for expansion. Like the LC, it has no built-in NuBus slot, is quite short, and has a curved front. But with an adapter, the […]
Six months after moving from 16 MHz to 25 MHz with the IIci, Apple introduced the “wicked fast” 40 MHz IIfx. This was the Mac of choice for graphic designers, offering nearly three times the performance of the IIx – thanks to a lightning fast CPU, a new type of RAM, and special SCSI DMA […]
Building on the success of the Mac IIcx, the IIci offers 56% more power in the same compact case. A new feature was integrated video. The big advantage: Users no longer needed to buy a separate video card. The big disadvantage: The built-in video uses system memory (this is sometimes called “vampire video”).
Building on the success of the Mac IIx, the 1989 IIcx offered the same horsepower in a smaller case. This was made possible by eliminating 3 NuBus slots and using a smaller (90W) power supply.
Rolled out in January 1989, the SE/30 was the first compact Mac to come standard with the FDHD 1.4 MB floppy drive (a.k.a. SuperDrive) and support more than 4 MB of RAM. It was essentially a IIx in an SE case.
Building on the success of the Mac II, the 1988 Mac IIx housed a 68030 CPU and 68882 FPU (floating point unit) in the same case. Breakthrough features included the DOS-compatible 1.4 MB SuperDrive (a.k.a. FDHD for floppy disk, high density) and virtual memory. Although advertised as a 32-bit computer, the Mac IIx ROMs were […]
Rolled out in March 1987 along with the compact Mac SE, the Mac II was the first modular Mac – a revolutionary change in the Macintosh line (so revolutionary that it had to be kept secret from Steve Jobs, who loved the simplicity of all-in-one designs). Options include two 800K floppy drives and a hard […]
Introduced along with the Mac II in March 1987, the SE came with 1 MB of RAM, one or two double-sided 800K floppies, and space to mount an internal SCSI hard drive (the second drive bay held either a hard drive or second floppy – no room for both, although that didn’t stop some people from […]
Introduced in January 1986, two years after the original Macintosh, the Mac Plus shipped with 1 MB of RAM, a new double-sided 800 KB floppy drive, and a built-in SCSI port (the first Mac so equipped). Not only was 1 MB more RAM than PC-class machines could handle, but the Plus could be expanded to 4 MB total […]