Apple chose to "upgrade" the name to include Pro because of several key improvements, felt to be professional-level features. Introduced in June 2009, the MacBook Pro (13-inch, Mid 2009) replaced the MacBook (13-inch, Aluminum, Late 2008). A single 3.5mm jack could be used for analog or optical audio out, or analog audio in. Though reported as a 256 MB graphics system, the chipset actually used up to 272 MB of RAM. The MacBook Pro's graphics chipset used a portion of main memory as VRAM. Optical Drive: 24x/24x/10x/8x/8x/4x/4x CD-RW/DVD±RW/DVD±R DLĪudio Out: stereo 24 bit mini, Optical S/PDIF Level 1 Cache: 32 kB data, 32 kB instruction CPU: Intel Mobile Core 2 Duo (P7xxx/P8xxx)
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