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The Macintosh SE is a personal computer manufactured by Apple between March 1987 and October 1990. This computer marked a significant improvement on the Macintosh Plus design and was introduced by Apple at the same time as the Macintosh II. It had a similar case to the original Macintosh computer, but with slight differences in color and styling. ==Features== The SE's notable new features, compared to its similar predecessor the Macintosh Plus, were: * First compact Macintosh with an internal drive bay for a hard disk (originally 20 MB or 40 MB) or a second floppy drive. * First compact Macintosh that featured an expansion slot (SE stood for "System Expansion").〔 * Used the Apple Desktop Bus (ADB), introduced with the Apple IIGS, for keyboard and mouse interface. * Improved SCSI support with faster data throughput. * Better reliability and longer life expectancy due to the addition of a cooling fan. The SE was designed to accommodate either one or two floppy drives, or a floppy drive and a hard drive. After-market brackets were designed to allow the SE to accommodate two floppy drives as well as a hard drive, however it was not a configuration supported by Apple. In addition an external floppy disk drive could also be connected, making the SE the only other Macintosh besides the Macintosh Portable and Macintosh II which could support three floppy drives, though its increased storage, RAM capacity and optional internal hard drive rendered the external drives less of a necessity than for its predecessors. After Apple introduced the Macintosh SE/30 in January 1989, a logic board upgrade was sold by Apple dealers as a high-cost upgrade for the SE, consisting of a new SE/30 motherboard, case front and internal chassis to accommodate the upgrade components. Single-floppy SE models also featured a drive access light in the spot where the second floppy drive would be. Additionally the SE had a special PDS slot that allowed for expansion cards, such as accelerators, to be installed. The SE can be upgraded to 50 MHz and more than 5 MB with the MicroMac accelerators. In the past other accelerators were also available such as the Sonnet Allegro. Since installing a card required opening the computer's case and exposing the user to high voltages from the internal CRT, Apple recommended only authorized Apple dealers to install cards and sealed the case with then-uncommon Torx screws. The Macintosh SE ROM size increased from 64 KB in the original Mac to 256 KB, which allowed the development team to include an Easter Egg hidden in the ROMs. By jumping to address 0x41D89A or reading from the ROM chips it is possible to display the four images of the engineering team.〔(【引用サイトリンク】 Macintosh Plus Easter Egg - Image of Designers in ROM )〕 The SE and Macintosh II were the first Apple computers since the Apple I to be sold without a keyboard. Instead the customer was offered the choice of the new ADB Apple Keyboard or the Apple Extended Keyboard. Apple produced ten SEs with transparent cases as prototypes for promotional shots and employees. They are extremely rare and command a premium price for collectors.〔(【引用サイトリンク】publisher=Low End Mac )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Macintosh SE」の詳細全文を読む スポンサード リンク
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