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Mac 512K side-view showing interrupt and reset interface As with the original Macintosh, the 512K was designed with no slots for upgrade boards and had no hard-disk controller, so the few internal upgrades that were available for the 512K, such as General Computer 's US$2,795 Hyperdrive hard drive, had to plug directly into the 68000 processor ...
Because Apple's official upgrades were costly, many third-party manufacturers offered add-on SCSI cards, as well as RAM upgrades, to achieve the same functionality. The new ROM allowed the computer to run much newer system and application software; though it loaded more data into RAM, it only slightly decreased the amount of available memory ...
Protected memory was only added to Macintosh computers with the release of the Mac OS X operating system. According to Andy Hertzfeld, the Macintosh used for the introduction demo on January 24, 1984, was a prototype with 512k RAM, even though the first model offered for sale implemented just 128k of non-expandable memory. This prototype was ...
Although this had always been planned from the beginning, Steve Jobs maintained if the user desired more RAM than the Mac 128 provided, he should simply pay extra money for a Mac 512 rather than upgrade the computer himself. When the Mac 512 was released, Apple rebranded the original model as "Macintosh 128k" and modified the motherboard to ...
The display is capable of supporting up to thousands of colors with a video memory upgrade. A slightly updated model, the Color Classic II , featuring the Macintosh LC 550 logic board with a 33 MHz processor, was released in Japan, Canada and some international markets in 1993, sometimes as the Performa 275.
While the Mac OS memory model, with all its inherent problems, remained this way right through to Mac OS 9, due to severe application compatibility constraints, the increasing availability of cheap RAM meant that by and large most users could upgrade their way out of a corner. The memory was not used efficiently, but it was abundant enough that ...
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