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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
Page mode DRAM was in turn later improved with a small modification which further reduced latency. DRAMs with this improvement are called fast page mode DRAMs (FPM DRAMs). In page mode DRAM, the chip does not capture the column address until CAS is asserted, so column access time (until data out was valid) begins when CAS is asserted.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Fast_Page_Mode_DRAM&oldid=701215709"
In order to make up somewhat for the lack of registers, the 6502 includes a zero page addressing mode that uses one address byte in the instruction instead of the two needed to address the full 64 KB of memory. This provides fast access to the first 256 bytes of RAM by using shorter instructions. For instance, an instruction to add a value from ...
This type of SDRAM is slower than the DDR variants, because only one word of data is transmitted per clock cycle (single data rate). But this type is also faster than its predecessors extended data out DRAM (EDO-RAM) and fast page mode DRAM (FPM-RAM) which took typically two or three clocks to transfer one word of data.
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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]