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A Macintosh 128K Also known as Apple Macintosh Manufacturer Product family Release date January 24, 1984; 34 years ago ( 1984-01-24) Introductory price US$2,495 (equivalent to $5,877 in 2017) Discontinued October 1, 1985 ( 1985-10-01) @ 7.8336 (6 MHz effectively) Memory 128 RAM (built-in) Dimensions Height: 13.6 inches (35 cm) Width: 9.6 inches (24 cm) Depth: 10.9 inches (28 cm) Weight 16.5 pounds (7.5 kg) Predecessor Successor The Macintosh 128K, originally released as the Apple Macintosh, is the original. Its beige case consisted of a 9 in (23 cm) CRT monitor and came with a keyboard and mouse. A handle built into the top of the case made it easier for the computer to be lifted and carried. It had an initial selling price of $2,495 (equivalent to $5,877 in 2017).
The Macintosh was introduced by the now-famous $370,000 (equivalent to $871,550 in 2017) television commercial by, ', that most notably aired on during the third quarter of on January 22, 1984. Sales of the Macintosh were strong from its initial release on January 24, 1984, and reached 70,000 units on May 3, 1984. Upon the release of its successor, the, it was rebranded as the Macintosh 128K.
Contents • • • • • • • • • • • • • • Processor and memory [ ] The centerpiece of the machine was a running at 7.8336 MHz, connected to 128 KB shared by the processor and the display controller. The boot procedure and some operating system routines were contained in an additional 64 KB chip. Apple did not offer RAM upgrades. Unlike the Apple II, no source code listings of the Macintosh system ROMs were offered. The RAM in the Macintosh consisted of sixteen 4164 64k×1 DRAMs.
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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. Speed boost for mac. This made the machine run more slowly than several of its competitors, despite the nominally high clock rate.
Mac 128s and 512s were commonly equipped with -branded 4164 RAM chips for cost reasons, however Micron's quality control was poor and the chips were a common failure point. Back case of an unaltered original Macintosh (sold January–November 1984). Those made after November 1984 have the label 'Macintosh 128K' on the back of the case. Peripherals [ ] The built-in display was a one-bit, 9 in (23 cm) with a fixed resolution of 512×342, establishing the standard of 72. Expansion and networking were achieved using two non-standard serial ports named 'printer' and 'modem'; they did not support hardware. An external drive could be added using a proprietary connector (19-pin ). The keyboard and mouse used simple proprietary protocols, allowing some third-party upgrades.