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All Indigo2 motherboards have 12 SIMM slots, for standard 36-bit parity 72-pin fast page mode SIMM memory modules seated in groups of four. Indigo2 can be expanded to a thermal specification maximum of either 384 MB or 512 MB RAM.
30-pin SIMM, 256 KB capacity Two 30-pin SIMM slots on an IBM PS/2 Model 50 motherboard. Standard sizes: 256 KB, 1 MB, 4 MB, 16 MB. 30-pin SIMMs have 12 address lines, which can provide a total of 24 address bits. With an 8-bit data width, this leads to an absolute maximum capacity of 16 MB for both parity and non-parity modules (the additional redundancy-bit chip usually doe
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The SIMMs are protected by ECC, and the ECC implementation can correct single-bit errors and detect double-bit errors. The SIMMs also contain built-in self-test circuitry, which tests the SIMM during power on or reset and alerts the firmware, which disables the bank(s) of memory containing faulty SIMM(s), if faults are detected. [6]
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Fast page mode DRAM was introduced in 1986 and was used with the Intel 80486. Static column is a variant of fast page mode in which the column address does not need to be latched, but rather the address inputs may be changed with CAS held low, and the data output will be updated accordingly a few nanoseconds later.
The burst will continue until interrupted. Full-row bursts are only permitted with the sequential burst type. Later (double data rate) SDRAM standards use more mode register bits, and provide additional mode registers called "extended mode registers". The register number is encoded on the bank address pins during the load mode register command.