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Retailing for $3,898 (US) base price, the Macintosh II was the first "modular" Macintosh model, so called because it came in a standard desktop case. All previous Macintosh computers used an all-in-one design with a built-in black-and-white monitor. The Mac II allowed Macintosh users a choice of larger displays, color displays, and even multiple displays. The Macintosh II was designed by hardware engineers Michael Dhuey (computer) and Brian Berkeley (monitor).
Introduced in 1987, the Mac II featured a Motorola 68020 processor operating at 16 MHz teamed with a Motorola 68881 floating point unit. Standard memory was 1 mebibyte, expandable to 68 MiB, though not without the special FDHD upgrade kit; otherwise, 20 MiB was the maximum. RAM could be maxed out to 128 MiB, however, if the ROMs were upgraded to those used in the IIx (or if MODE32 was used), as the Mac II's memory controller supported higher-density memory modules than did the stock ROM. The Mac II had eight 30-pin SIMMs, and memory was installed in groups of four. 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. 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). The Mac II was the first Macintosh with color graphics capabilities. From Wikipedia
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 "Apple Macintosh II")
