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COAST, an acronym for ''cache on a stick'', is a packaging standard for modules containing SRAM used as an L2 Cache in a computer. COAST modules look like somewhat oversided SIMM modules. COAST modules were somewhat popular in the early 1990s, but as of 2004, most cache is build-in to either the CPU or the Motherboard . COAST modules decoupled the motherboard from its cache, allowing varying configurations to be created. A low-cost system could run with no cache, while a more expensive system could come equipped with 512 KB or more cache. Later COAST modules were equipped with Pipelined-burst SRAM .

The standard was originally defined by Motorola to be between 4.33 and 4.36 inches (110 and 111 mm) wide, and between 1.12 and 1.16 inches (28 and 29 mm) high. It could be found in many Apple Macintosh in the early-to-mid-90s, but disappeared as the Mac moved to the PowerPC platform.

Intel also used the COAST standard for their Pentium systems, where it could be found as late as 1998 in Pentium MMX systems utilizing chipsets such as Intel's 430VX and 430TX. Later, Intel combined this architecture with the CPU and created the Slot 1 CPU cartridge which contained both the CPU core and separate cache chips.