<P> The RAM in the Macintosh consisted of sixteen 4164 64k × 1 DRAMs . </P> <P> The 68000 and video controller took turns accessing DRAM every four CPU cycles during display of the frame buffer, while the 68000 had unrestricted access to DRAM during vertical and horizontal blanking intervals . Such an arrangement reduced the overall performance of the CPU as much as 35% for most code as the display logic often blocked the CPU's access to RAM . This made the machine run more slowly than several of its competitors, despite the nominally high clock rate . </P> <P> The built - in display was a one - bit black - and - white, 9 in (23 cm) CRT with a fixed resolution of 512 × 342 pixels, establishing the desktop publishing standard of 72 PPI . Expansion and networking were achieved using two non-standard RS - 422 DE-9 serial ports named "printer" and "modem"; they did not support hardware handshaking . An external floppy disk drive could be added using a proprietary connector (19 - pin D - sub). The keyboard and mouse used simple proprietary protocols, allowing some third - party upgrades . The original keyboard had no arrow keys, numeric keypad or function keys . This was an intentional decision by Apple, as these keys were common on older platforms and it was thought that the addition of these keys would encourage software developers to simply port their existing applications to the Mac, rather than design new ones around the GUI paradigm . Later, Apple would make a numeric keypad available for the Macintosh 128K . The keyboard sold with the newer Macintosh Plus model would include the numeric keypad and arrow keys, but still no function keys . As with the Apple Lisa before it, the mouse had a single button . Standard headphones could also be connected to a monaural jack . Apple also offered their 300 and 1200 bit / s modems originally released for the Apple II line . Initially, the only printer available was the Apple ImageWriter, a dot matrix printer which was designed to produce 144 dpi WYSIWYG output from the Mac's 72 dpi screen . Eventually, the LaserWriter and other printers were capable of being connected using AppleTalk, Apple's built - in networking system . </P> <P> The Macintosh contained a single 400 KB, single - sided 3.5 - inch floppy disk drive, dedicating no space to other internal mechanical storage . The Mac OS was disk - based from the beginning, as RAM had to be conserved, but this "Startup Disk" could still be temporarily ejected . (Ejecting the root filesystem remained an unusual feature of the classic Mac OS until System 7 .) One floppy disk was sufficient to store the System Software, an application and the data files created with the application . Indeed, the 400 KB drive capacity was larger than the PC XT's 360 KB 5.25 - inch drive . However, more sophisticated work environments of the time required separate disks for documents and the system installation . Due to the memory constraints (128 KB) of the original Macintosh, and the fact that the floppies could hold 400 KB, users frequently had to swap disks in and out of the floppy drive . For this reason, external floppy drives were frequently used . The Macintosh External Disk Drive (mechanically identical to the internal one, piggybacking on the same controller) was a popular add - on at US $495 . Third - party hard drives were considerably more expensive and usually connected to the slower serial port (as specified by Apple), though a few manufacturers chose to use the faster non-standard floppy port . The 128K can only use the original Macintosh File System for storage . </P>

How much hard drive space did the first apple computer have
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