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The Apple 80-Column Text Card is an expansion card for the Apple IIe computer to give it the option of displaying 80 columns of text instead of 40 columns. Two models were available; the cheaper 80-column card has just enough extra RAM to double the video memory capacity, and the Extended 80-Column Text Card has an additional 64 kilobytes of RAM, bringing the computer's total RAM to 128 KB.
The memory was not used efficiently, but it was abundant enough that the issue never became critical. This is ironic given that the purpose of the original design was to maximise the use of very limited amounts of memory. Mac OS X finally did away with the whole scheme, implementing a modern paged virtual memory scheme.
macOS, originally Mac OS X, previously shortened as OS X, ... RAM requirement 10.0 – 10.2: 2001 – 2002 G3, G4 and G5 iBook and PowerBook, Power Mac and iMac
Memory diagnostic software programs (e.g., memtest86) are low-cost or free tools used to check for memory failures on a PC. They are usually in the form of a bootable software distribution on a floppy disk or CD-ROM. The diagnostic tools provide memory test patterns which are able to test all system memory in a computer.
As part of the Mac transition to Intel processors, Apple released a 13-inch laptop simply named "MacBook", as a successor to the PowerPC-based iBook series of laptops. . During its existence, it was the most affordable Mac, serving as the entry-level laptop that was less expensive than the rest of the Mac laptop lineup (the MacBook Pro portable workstation, and later the MacBook Air ultra-port
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TransWarp GS — Apple IIGS accelerator card; GS-RAM, GS-RAM Ultra, GS-RAM Plus — Apple IIGS memory expansion cards. The cards hold 1.5 MB, 4 MB, and 6 MB respectively. RamKeeper — Battery backed RAM drive for the Apple IIGS; Sonic Blaster — Apple IIGS sound card; Audio Animator — Apple IIGS sound card with external audio mixer and MIDI I/O
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related to: how to check ram macbook