Apple Macintosh II Motherboard and Memory Modules
Mon, 2010-03-29 18:24 — walker
Donor: Janet Gibson
This motherboard, dated 1987, provides the backbone for computer processing on a Macintosh II computer. The larger chip (with a gray metal covering) is the Motorola 68020 central processing chip. The smaller chip (with the gray metal covering) is the Motorola 68881 Floating Point Processing chip.
The motherboard contains space for six NuBus slots (left) and eight SIMM slots (right).
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SIMM denotes single in-line memory module. The version here utilizes 30 pins or connections from the memory module to the motherboard. As part of this display, there are four modules of each of the following types.
- The NEC chips support 256K memory.
- The TC511000AJL-70 chips, made by Toshiba, contains eight 256K SIMM memory chips.
- The KM41C1000P chips, made by Apple, also support 1M memory.
- The NuBus slots allow 32-bit parallel access to the computer bus, following a technology originally developed at MIT.
Here three TC511000AJL-70 chips, made by Toshiba, and two KM41C1000P chips, made by Apple, and two are plugged into the SIMM slots.
