APPENDIX
89
DIMM (Dual In Line Memory Module)
DIMM socket is built with a 168-pin assignment and supports 64-bit data.
DIMM can be single or double sided. The golden finger signals on each
side of the module are different, and that is why it is called Dual In Line.
Almost all DIMMs are made with SDRAM now, which operate at 3.3V.
Some old DIMMs are made by FPM/EDO and only operate at 5V.
DMA (Direct Memory Access)
Channel for communications between memory and surrounding devices.
ECC (Error Checking and Correction)
The ECC algorithm has the ability to detect double-bit error and automatically
correct single-bit error while parity mode can only detect single-bit error.
ECP (Enhanced Communication Port)
ECP is a technology designed to improved I/O for parallel ports.
EPP (Enhanced Parallel Port)
EPP is a standard that supports data transfer rates of up to 500 kps for parallel
printers
EDO (Extended Data Output) Memory
Unlike traditional FPM (Fast Page Mode) memory that tri-states the memory
output data to start the pre-charge activity, EDO DRAM holds the memory
data valid until the next memory access cycle, which is similar to pipeline
effect in reducing one clock state.
EEPROM (Electronic Erasable Programmable ROM)
Both EEPROM and Flash ROM can be re-programmed by electronic signals,
but the interface technology is different. Size of EEPROM is much smaller
than flash ROM. BIOS is now generally stored in EEPROM or Flash ROM.
EPROM (Erasable Programmable ROM)
Traditional mainboard stores BIOS codes in EPROM which can only be
erased by ultra-violet (UV) light. If BIOS has to be updated, you need to
remove EPROM from mainboard, clear data by UV light, re-program, and
then insert it back to socket.
