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• If you spilled water on your MacBook while it was on, you need to turn it off immediately. Don’t save your work first, don’t close down your apps, don’t even open the Apple menu. Just hold the power button until your MacBook turns off. Unplug accessories and disconnect the battery.
• After letting it stay for some time upside down, I returned it to normal position and removed the keycaps of the buttons where the water spilled, but the water didn't seem to have entered, because all of them were dry below the keycap (I didn't remove the power keycap to see though, because I didn't want to turn the macbook on).

If Your Apple Mac Fell in Water

Let’s pretend your Apple Mac laptop fell in a puddle of dirty water and was completely submerged for a few minutes. Is there any possibility to resuscitate your beloved electronic device?

Unfortunately, the chances are pretty low, so don’t get your hopes up too high; however, there are some things you can do to try and fix the problem:

Start from the OS X Install Disk – Use Disk Utility. Insert your Installation Disk, or create a Bootable USB Drive and connect it to your Mac. Try to boot up in same version of the OS that you’re having the problem in if possible. Shut down the Mac; Start up the Mac while holding down the “C” key; Once started, goto Disk Utility in the Utility menu.

Remove the battery (If possible! If not, ask for it to be taken out at Genius bar at an Apple store), immediately unplug the power adapter, disconnect all peripherals and power cord. Fill a bucket with distilled water and slosh the MBP around in it in every direction, upside down, etc. (You may use a mild solvent bath, and a light thinner or even alcohol, since it draws the water out and evaporates faster; however, keep in mind that if the solvent is too strong, it’ll melt stuff, so stay away from MEK or acetone).

Stand it on each side and keep flipping it until water stops draining out. Turn the computer over with the lid partly open and the hinge facing upward to let the liquid drain. Do not flop your unhappy Mac over and lay it flat – you want to separate it from the moisture. Place cloth towels or paper under the machine to sop up the mess.

After that, let it dry for at least three to five days in plain sunlight, rotating the side it stands on each day.

Don’t try to turn it on before it is completely dry. When it seems like all the moisture is completely gone, then you can give it a shot. If nothing happens, no sound or lights, then it’s possible the innards were still wet. If this is the case, wait for a few more days.

Water in your Mac is a pretty difficult issue to solve, so be prepared to hear from a technician that your Mac may never recover. Your only option if it is dead, is to try and sell it for what it’s now worth (just a few dollars) and buy a new one. (If your homeowners’ insurance covers computers, it might actually be the best option, but just make sure to notify them of the accident right away).

There is a chance that even if your Mac does start up after the drying process, it will not work later. Sugary, acidic or milky drinks will cause problems as the residue starts slowly corroding the computer innards. Hopefully this hasn’t happened to you and if it has, we hope we have helped you get your Mac up and running again!

­See also:

• Apple Encyclopedia: all information about products, electronic devices, operating systems and apps from iGotOffer.com experts.
• iGotOffer.com: the best place to sell my old MacBook online. Top cash guaranteed. Free quote and free shipping. BBB A+ rated business.

The Macintosh II is a personal computer designed, manufactured, and sold by Apple Computer from March 1987 to January 1990. Based on the Motorola 68020 32-bit CPU, it is the first Macintosh supporting color graphics. When introduced, a basic system with monitor and 20 MB hard drive cost US$5,498 (equivalent to $12,373 in 2019). With a 13-inch color monitor and 8-bit display card the price was around US$7,145 (equivalent to $16,079 in 2019).^[1] This placed it in competition with workstations from Silicon Graphics, Sun Microsystems, and Hewlett-Packard.

The Macintosh II was the first computer in the Macintosh line without a built-in display; a monitor rested on top of the case like the IBM PC and Amiga 1000. It was designed by hardware engineersMichael Dhuey (computer) and Brian Berkeley (monitor) and industrial designerHartmut Esslinger (case).

Eighteen months after its introduction, the Macintosh II was updated with a more powerful CPU and sold as the Macintosh IIx. In early 1989, the more compact Macintosh IIcx was introduced at a price similar to the original Macintosh II, and by the beginning of 1990 sales stopped altogether. Motherboard upgrades to turn a Macintosh II into a IIx or Macintosh IIfx were offered by Apple.

Development[edit]

Two common criticisms of the Macintosh from its introduction in 1984 were the closed architecture and lack of color; rumors of a color Macintosh began almost immediately.^[2]

The Macintosh II project was begun by Dhuey and Berkeley during 1985 without the knowledge of Apple co-founder and Macintosh division head Steve Jobs, who opposed expansion slots and color, on the basis that the former complicated the user experience and the latter did not conform to WYSIWYG—color printers were not common.^[3] He instead wanted higher-resolution monochrome displays.^[4]

Initially referred to as 'Little Big Mac', the Macintosh II was codenamed 'Milwaukee' after Dhuey's hometown, and later went through a series of new names. After Jobs was fired from Apple in September 1985, the project could proceed openly.

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The Macintosh II was introduced at the AppleWorld 1987 conference in Los Angeles,^[5] with low-volume initial shipments starting two months later.^[6] Retailing for US $5,498,^[7] the Macintosh II was the first modular Macintosh model, so called because it came in a horizontal desktop case like many IBM PC compatibles of the time. Previous Macintosh computers use an all-in-one design with a built-in black-and-white CRT.

The Macintosh II has drive bays for an internal hard disk (originally 40 MB or 80 MB) and an optional second floppy disk drive. It, along with the Macintosh SE, was the first Macintosh to use the Apple Desktop Bus (ADB) introduced with the Apple IIGS for keyboard and mouse interface.

The primary improvement in the Macintosh II was Color QuickDraw in ROM, a color version of the graphics routines. Color QuickDraw can handle any display size, up to 8-bit color depth, and multiple monitors. Because Color QuickDraw is included in the Macintosh II's ROM and relies on 68020 instructions, earlier systems could not be upgraded to display color.

In September 1988, shortly before the introduction of the Macintosh IIx, Apple increased the list price of the Macintosh II by roughly 20%.^[8]

Hardware[edit]

CPU: The Macintosh II is built around the Motorola 68020 processor operating at 16 MHz, teamed with a Motorola 68881floating point unit. The machine shipped with a socket for an MMU, but the 'Apple HMMU Chip' (VLSI VI475 chip) was installed that did not implement virtual memory (instead, it translated 24-bit addresses to 32-bit addresses for the Mac OS, which would not be 32-bit clean until System 7).

Memory: The standard memory was 1 megabyte, expandable to 8 MB.^[9] The Mac II had eight 30-pin SIMMs, and memory was installed in groups of four (called 'Bank A' and 'Bank B').

The original Macintosh II did not have a PMMU by default. It relied on the memory controller hardware to map the installed memory into a contiguous address space. This hardware had the restriction that the address space dedicated to bank A must be larger than those of bank B. Though this memory controller was designed to support up to 16MB 30-pin SIMMs for up to 128MB of RAM, the original Macintosh II ROMs had problems limiting the amount of RAM that can be installed to 8MB. The Macintosh IIx ROMs that also shipped with the FDHD upgrade fixed this problem, though still do not have a 32-bit Memory Manager and cannot boot into 32-bit addressing mode under Mac OS (without the assistance of MODE32).^[10]MODE32 contained a workaround that allowed larger SIMMs to be put in Bank B with the PMMU installed. In this case, the ROMs at boot think that the computer has 8MB or less of RAM. MODE32 then reprograms the memory controller to dedicate more address space to Bank A, allowing access to the additional memory in Bank B. Since this makes the physical address space discontiguous, the PMMU is then used to remap the address space into a contiguous block.

Graphics: The Macintosh II includes a graphics card that supports a true-color 16.7 million color palette^[11] and was available in two configurations: 4-bit and 8-bit. The 4-bit model supports 16 colors on a 640×480 display and 256 colors (8-bit video) on a 512×384 display, which means that VRAM was 256 KB. The 8-bit model supports 256-color video on a 640×480 display, which means that VRAM was 512 KB in size. With an optional RAM upgrade (requiring 120ns DIP chips), the 4-bit version supports 640×480 in 8-bit color.^[12] The video card does not include hardware acceleration of drawing operations.

Display: Apple offered a choice of two displays, a 12' black and white unit, and a more expensive 13' high-resolution color display based on Sony's Trinitron technology. More than one display could be attached to the computer, and objects could be easily dragged from one screen to the next. Third-party displays quickly became available. The Los Angeles Times reviewer called the color 'spectacular.'^[13] The operating system user interface remained black and white even on color monitors with the exception of the Apple logo, which appeared in rainbow color.

Storage: A 5.25-inch 40 MB internal SCSI hard disk was optional, as was a second internal 800 kilobyte 3.5-inch floppy disk drive.

Expansion: Six NuBus slots were available for expansion (at least one of which had to be used for a graphics card, as the Mac II had no onboard graphics chipset and the OS didn't support headless booting). It is possible to connect as many as six displays to a Macintosh II by filling all of the NuBus slots with graphics cards. Another option for expansion included the Mac286, which included an Intel 80286 chip and could be used for MS-DOS compatibility.

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The original ROMs in the Macintosh II contained a bug that prevented the system from recognizing more than one megabyte of memory address space on a Nubus card. Every Macintosh II manufactured until approximately November 1987 had this defect. This happened because Slot Manager was not 32-bit clean.^[14] Apple offered a well-publicized recall of the faulty ROMs and released a program to test whether a particular Macintosh II had the defect. As a result, it is rare to find a Macintosh II with the original ROMs.^{[citation needed]}

Accessories: The Macintosh II and Macintosh SE 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 as a separate purchase. Dealers could bundle a third-party keyboard or attempt to upsell a customer to the more expensive (and higher-profit) Extended Keyboard.

Audio: The Macintosh II was the first Macintosh to have the Chimes of Death accompany the Sad Mac logo whenever a serious hardware error occurred.

The new extensions featured for the Macintosh II at the time were A/ROSE and Sound Manager.^{[citation needed]}

Models[edit]

The Macintosh II was offered in three configurations. All systems included a mouse and a single 800 KB 3.5-inch floppy disk drive; a 68551 PMMU was available as an option.^[15]

• Macintosh II CPU: 1 MB RAM.
• Macintosh II 1/40 CPU: 1 MB RAM, internal 40-megabyte SCSI HDD.
• Macintosh II 4/40 CPU: 4 MB RAM, internal 40-megabyte SCSI HDD.

Timeline of Macintosh II models

References[edit]

1. ^Edwards, Benj (June 7, 2012). 'The Macintosh II celebrates its 25th anniversary'. Macworld.
2. ^Bartimo, Jim (February 25, 1985). 'Macintosh: Success And Disappointment'. InfoWorld. p. 30. Retrieved January 27, 2015.
3. ^'The Color Convergence'.
4. ^Webster, Bruce (December 1985). 'Microcomputer Color Graphics-Observations'. BYTE. p. 405. Retrieved October 28, 2013.
5. ^'Local Area Networks Newsletter'. Vol. 5 no. 4. April 1987. p. 1.Cite magazine requires magazine= (help)
6. ^'Apple Begins Shipments Of Macintosh II Computer'. Wall Street Journal. May 8, 1987.
7. ^'Mac GUI :: Macintosh II and Macintosh SE announced'. macgui.com. Retrieved April 11, 2018.
8. ^Michael Wang (September 13, 1988). 'Apple price increases'. Newsgroup: comp.sys.mac. Usenet:3642@Portia.Stanford.EDU.
9. ^Apple Announces 68030 Macintosh IIx With High Density Compatible DriveArchived September 8, 2012, at archive.today by John Cook and Carol Cochrane, Business Wire 09/19/88 (retrieved September 20, 2009)
10. ^Series: The 24-bit ROM Blues by Adam C. Engst, Tidbits, April 22, 1991 (retrieved September 21, 2009)
11. ^'OLD-COMPUTERS.COM : The Museum'. www.old-computers.com. Retrieved April 11, 2018.
12. ^'Macintosh II High Resolution Video Card'. lowendmac.com. June 7, 1989. Retrieved April 11, 2018.
13. ^Magid, Lawrence J. (March 2, 1987). 'Apple's Two New Machines Are Dandy'. Los Angeles Times. Retrieved June 20, 2019. ...the color is spectacular. Unlike most color monitors, it also displays very readable text.
14. ^InfoWorld Magazine, October 26, 1987, p.47
15. ^'Macintosh II - Product Details'(PDF). Apple.

External links[edit]

• Mac II profile on Low End Mac
• Macintosh II technical specifications at apple.com

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