The Macintosh Hard Disk 20 was the first hard drive developed by Apple specifically for use with the Macintosh 512K.Introduced on September 17, 1985, it was part of Apple’s long awaited solution toward completing the Macintosh Office (a suite of integrated business hardware and software) announced in January 1985.
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Connects to | Macintosh Plus; Macintosh SE; Macintosh II via:
Apple IIe; Apple IIGS via:
|
---|---|
Design firm | Apple Inc. |
Manufacturer | Apple Inc. |
Introduced | September 1986[1][2] |
Discontinued | 1989 |
Cost | US$1,299 (equivalent to $3,030 in 2019)[3] |
Type | Hard Disk |
Memory | 20 MB |
Connection | Direct |
Ports | SCSI DB-25 x2 |
Power consumption | 30 W |
Weight | 9 lbs (4 kg) |
Dimensions | 3.1 x 9.7 x 10.5 (inches) 78.5 x 246 x 266 (mm) |
The Apple Hard Disk 20SC is Apple's first SCSI based hard drive for the Apple II family as well as the Macintosh and other third party computers using an industry standard SCSI interface.
History[edit]
Adbfire for mac download. Released in September 1986 along with the Apple IIGS (which required an optional SCSI interface card to use it), it debuted over 9 months after the introduction of the Macintosh Plus, the first to include Apple's SCSI interface. It was a welcome addition, delivering considerably faster data transfer rates (up to 1.25 megabytes per second)[4] than its predecessors, the Hard Disk 20 (62.5 Kilobytes per second)[5] and ProFile.[6]
Hardware[edit]
The 20SC originally contained a half height 5.25' Seagate ST-225N 20MB SCSI hard drive, but was later manufactured with a full-height 3.5' MiniScribe 8425SA 20MB SCSI hard drive. The latter drive was the same size as the drive inside the Macintosh Hard Disk 20, but 10 to 15 MB over what had previously been offered by Apple for the II family. The same drive mechanism would also be offered 6 months later as a built-in drive option on the Macintosh II and SE. It had two standard Centronics 50-pin connectors, one for the System and one for daisy-chaining additional SCSI devices and a SCSI ID selection switch. An external terminator was required if it was the only SCSI device connected. The case itself could accommodate a 3.5' or 5.25' full-height hard drive mechanism. Indeed, the case design would be reused unchanged (in Platinum only) for 3 more models introduced the following year: 40SC, 80SC & 160SC (offering respective Megabytes of storage). While the transfer rates were significantly higher due to the faster SCSI bus technology, the actual transfer rate varied from computer to computer thanks to different SCSI implementation based on developing industry standards.[7]
Design[edit]
In addition to being the first cross-platform drive offered by Apple it was the first hard drive to use the Snow White design language. Notably, it was the only Snow White product to use the Macintosh beige color and one of the few Apple products to be introduced in two different colors at the same time. Since the Apple IIGS was the first Apple product to debut in the new gray color they called Platinum, the 20SC had to both match it and the beige color of the Macintosh Plus, which it is designed to sit perfectly beneath. In 1987, all Apple products would change to Platinum, which would remain in use for the next 10 years.
See also[edit]
Macintosh Hard Disk 20 Model M0135 For Mac Download
References[edit]
- ^Industry News, U-M Computing News, Volume 1, 1986, Page 14, ..Apple announced the Hard Disk 20SC. The 20 megabyte hard disk drive features a small computer system interface (SCSI) for connection to the Macintosh Plus or the APPle II with a SCSI adapter card. The University price for the HD20SC will be $927, with delivery expected in November. The price does not include the required SCSI cable and terminator..
- ^Ehman Offers 2 SCSI Hard Drives for the Mac Plus, By Lisa L. Spiegelman, InfoWorld, 3 Nov 1986, Page 15, ..Other recently introduced SCSI drives include the Apple Hard Disk 20SC. Price at $1,299, it has a 65-millisecond access speed, the company said..
- ^Spiegelman, Lisa. 'Ehman Offers 2 SCSI Hard Drives for Mac Plus.' InfoWorld. 3 Nov. 1986: p. 15. Print.
- ^'Apple Hard Disk 20SC: Specifications (Discontinued)'. Archived from the original on May 16, 2011. Retrieved January 29, 2008.
- ^'Hard Disk 20: Specification (Discontinued)'. Archived from the original on May 16, 2011. Retrieved May 16, 2011.
- ^'ProFile Hard Drive: Specifications (Discontinued)'. Archived from the original on June 6, 2012. Retrieved May 29, 2011.
- ^'Apple HD SC: Specifications (Discontinued)'. Archived from the original on May 16, 2011. Retrieved January 29, 2008.
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Hard_Disk_20SC&oldid=969022034'
Also known as | Macintosh SE FDHD Macintosh SE SuperDrive |
---|---|
Manufacturer | Apple Computer, Inc. |
Product family | Compact Macintosh |
Type | All-in-one |
Release date | March 2, 1987; 33 years ago |
Introductory price | US$2900 (dual floppy) US$3900 (with 20 MB hard drive) |
Discontinued | October 15, 1990 |
Operating system | System 4.0 - System 7.5.5 |
CPU | Motorola 68000 @ 7.8 MHz |
Memory | 1-4 MB RAM (4x 150ns 30-pin SIMM) |
Display | 9 inches (23 cm) monochrome, 512 × 342 |
Dimensions | Height: 13.6 inches (35 cm) Width: 9.69 inches (24.6 cm) Depth: 10.9 inches (28 cm) |
Mass | 17 pounds (7.7 kg) |
Predecessor | Macintosh 512Ke Macintosh Plus |
Successor | Macintosh SE/30 Macintosh Classic |
![Model Model](https://i.stack.imgur.com/unR9K.jpg)
The Macintosh SE is a personal computer designed, manufactured, and sold by Apple Computer, Inc. from March 1987[1] to October 1990. It marked a significant improvement on the Macintosh Plus design and was introduced by Apple at the same time as the Macintosh II.
The SE retains the same Compact Macintosh form factor as the original Macintosh computer introduced three years earlier and uses the same design language used by the Macintosh II. An enhanced model, the SE/30, was introduced in January 1989; sales of the original SE continued. The Macintosh SE was updated in August 1989 to include a SuperDrive, with this updated version being called the 'Macintosh SE FDHD' and later the 'Macintosh SE SuperDrive'. The Macintosh SE was replaced with the Macintosh Classic, a very similar model which retained the same central processing unit and form factor, but at a lower price point.
Overview[edit]
The Macintosh SE was introduced at the AppleWorld conference in Los Angeles on March 2, 1987. The 'SE' is an acronym for 'System Expansion'.[2] Its 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.
- First Macintosh to support the Apple Desktop Bus (ADB), previously only available on the Apple IIGS, for keyboard and mouse connections.
- Improved SCSI support with faster data throughput and a standard 50-pin internal SCSI connector.
- Better reliability and longer life expectancy (15 years of continuous use)[3] due to the addition of a cooling fan.
- Upgraded video circuitry that results in a lower percentage of CPU time being spent drawing the screen. In practice this results in a 10-20 percent performance improvement.[4]
- Additional fonts and kerning routines in the Toolbox ROM[3]
- Disk First Aid is included on the system disk
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.[5]
Operating system[edit]
The Macintosh SE shipped with System 4.0 and Finder 5.4; this version is specific to this computer.[6] (The Macintosh II, which was announced at the same time but shipped a month later, includes System 4.1 and Finder 5.5.) The README file included with the installation disks for the SE and II is the first place Apple ever used the term 'Macintosh System Software', and after 1998 these two versions were retroactively given the name 'Macintosh System Software 2.0.1'.[7]
Hardware[edit]
Processor: Motorola 68000, 8 MHz, with an 8 MHz system bus and a 16-bit data path
RAM: The SE came with 1 MB of RAM as standard, and is expandable to 4 MB. The logic board has four 30-pin SIMM slots; memory must be installed in pairs and must be 150 ns or faster.
Macintosh Hard Disk 20 Model M0135 For Mac Os
Video: The built-in 512 × 342 monochrome screen uses 21,888 bytes of main memory as video memory.
Storage: The SE can 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 may also be connected, making the SE the only Macintosh besides the Macintosh Portable 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. Single-floppy SE models also featured a drive-access light in the spot where the second floppy drive would be. Hard-drive equipped models came with a 20 MB SCSI hard disk.
Battery: Soldered into the logic board is a 3.6 V 1/2AA lithium battery, which must be present in order for basic settings to persist between power cycles. Macintosh SE machines which have sat for a long time have experienced battery corrosion and leakage, resulting in a damaged case and logic board.
Expansion: A Processor Direct Slot on the logic board allows 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 that only authorized Apple dealers install the cards; the case was sealed with then-uncommon Torx screws.
Upgrades: 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.
Easter egg: The Macintosh SE ROM size increased from 64 KB in the original Mac and 128 KB in the Mac Plus 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.[8][9]
Inside the Macintosh SE
The main PCB from a 1988 Macintosh SE
Models[edit]
Introduced March 2, 1987:
- Macintosh SE[10]
Introduced August 1, 1989:
- Macintosh SE FDHD: Includes the new SuperDrive, a floppy disk drive that can handle 1.4 MB High Density (HD) floppy disks. FDHD is an acronym for 'Floppy Disk High Density'; later some Macintosh SE FDHDs were labeled Macintosh SE Superdrive, to conform to Apple's marketing change with respect to their new drive. High-density floppies would become the de facto standard on both the Macintosh and PC computers from then on. An upgrade kit was sold for the original Macintosh SE which included new ROM chips and a new disk controller chip, to replace the originals.[11]
- Macintosh SE 1/20: The name of the Macintosh SE FDHD with a 20 MB HDD when sold in Europe.
- Macintosh SE 1/40: The name of the Macintosh SE FDHD with a 40 MB HDD when sold in Europe.
Timeline of compact Macintosh models
See also[edit]
References[edit]
- ^Joel West (March 2, 1987). 'Macintosh II and Macintosh SE announced'. Newsgroup: comp.sys.mac. Usenet:[email protected]. Retrieved January 26, 2014.
- ^Goodin, Sue; Wilson, Dave (April 1987). 'Programming the New Macs'. Vol. 3 no. 5. MacTech.Cite magazine requires
|magazine=
(help) - ^ ab'How the SE Really Differs'. MacWorld Magazine. May 1987. p. 116.
- ^'Vectronic's Macintosh SE'.
- ^'Transparent Macintosh SE'. Low End Mac. Retrieved February 8, 2007.
- ^'Macintosh hardware releases'. earlymacintosh.org.
- ^'Macintosh: System Software Version History'.
- ^'Macintosh Plus Easter Egg - Image of Designers in ROM'. September 12, 1999. Retrieved January 26, 2014.
- ^Trammell Hudson (August 21, 2012). 'Ghosts in the ROM'. NYC Resistor. Archived from the original on February 17, 2015. Retrieved January 26, 2014.
- ^'Macintosh SE: Technical Specifications'. Apple.
- ^'Macintosh SE FDHD: Technical Specifications'. Apple.
External links[edit]
![Macintosh hard disk 20 model m0135 for mac free Macintosh hard disk 20 model m0135 for mac free](https://i.etsystatic.com/14704186/d/il/c6f415/2187067771/il_340x270.2187067771_qldb.jpg?version=0)
Wikimedia Commons has media related to Macintosh SE. |
Macintosh Hard Disk 20 Model M0135 For Mac Download
- The Mac SE Support Pages Repair & upgrade advice.
- Mac SE Low End Mac
Macintosh Hard Disk 20 Model M0135 For Mac Pro
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Macintosh_SE&oldid=974968692'