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With their II and III series getting rather long in the tooth, and the Lisa being rather pricey, Apple had to do something to get back into the small-business market. They did.

The Macintosh can be considered the very first commercially successful computer to use a GUI (Graphical User Interface). It was, however, not the first GUI based computer, the first GUI based computer ever sold was the Xerox Star 8010 in 1981.

It was launched a while after the Lisa and was a very attractive alternative to PC compatibles and their old MS-DOS, and text-based applications. After uncertain beginnings, it met with great success despite having no hard disk, single-sided floppy disks, no expansion slot and very little memory!

It was replaced later by the Macintosh 512 (the same but with 512 KB RAM) then later, by the Macintosh Plus.

The Macintosh 128 and Macintosh 512 were non-upgradeable, non-expandable in almost all departments, but especially with regard to memory. The 128 and 512 had memory chips soldered directly to the main logic board.

The original System file was designated 'Macintosh System 1.0'. Apple went as far as System 7 before changing the name to 'Mac OS'. The System/Finder suite was designated 'Macintosh System Software 0.0.'. It wasn't until System 6 that the System file version and System Software designation coincided.

There were also two variants of Macintosh 512K. The 512K was shipped with a 400K floppy drive and 64 KB ROM, which did not support hierarchical file systems. The 512K Enhanced was shipped with 128 KB of ROM, an 800K floppy drive, and supported HFS right out of the box.



I had the misfortune of blowing up one of the first Mac''s in the UK. Working for (what was then) one of the biggest dealers in the Country, I was told to get the new Mac out the cupboard and power it on. No-one mentioned the 240/110V converter.
Bang - puff of smoke $ dead Mac. Oops.

Saturday 7th February 2009
Mark Powell (UK)

a ? disk icon on the screen of mac performa 550 probably means dead HD. replace HD. download os 7.5 from (free) onto floppies. will take 16 floppies for whole os. good luck...

Thursday 27th March 2008
tomswift (usa)

I have a (vintage) Mac Performa 550 that needs a system 7 utilities disk to get it back up and running again. When I turn it on, the screen comes up with an icon of a blinking disk with a question mark in it. I don't have a system 7 back up disk and was wondering where I could get one?

If I can't get the old Mac.hine running again, I am planning to sell the entire works. I have lots and lots of programs , 2 printers, a Suma Graphics drawing tablet, Original manuals , an extra extended key board and more , more , more. Am just wondering if some one in the vintage Mac field could give me an estimate on how much it's all worth before I put it on the market. But, before I do that, I'd rather see if I could get it fixed. Thank you

Tuesday 11th December 2007
jewel king (Molalla, Or.)


TYPE  Home Computer
YEAR  January 1984
END OF PRODUCTION  October 1st, 1985
KEYBOARD  Full stroke 59-key
CPU  Motorola MC 68000
SPEED  7.83 MHz
RAM  128 kb (expandable to 512 kb)
ROM  64 kb
TEXT MODES  40 chars x 32 lines bit-mapped pseudo-character mode
GRAPHIC MODES  512 x 342 dots
COLORS  black & white 9'' monitor
SOUND  4 voices, 12 octave sound @ 22 kHz
SIZE / WEIGHT  13.6'' (H) x 9.6'' (W) x 10.9'' (D) / 16.5 lbs
I/O PORTS  Two serial (RS 232/422) for printer and modem, mouse, external floppy drive, sound out
BUILT IN MEDIA  One 400k 3.5'' internal floppy drive, 400K external drive optional
OS  Macintosh System 1.0
POWER SUPPLY  Built-in power supply unit
PRICE  $2495 (USA, 1984) - £1795 (U.K., 1984)



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