AOpen MK77M, Online Manual

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R R I I M M M M ( ( R R a a m m b b u u s s I I n n l l i i n n e e M M e e m m o o r r y y M M o o d d u u l l e e ) )
184-pin memory module that supports RDRAM memory technology. A RIMM memory module may contain up to maximum of 16
RDRAM devices.
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SDRAM is one of the DRAM technologies that allow DRAM to use the same clock as the CPU host bus ( EDO and FPM are
asynchronous and do not have clock signal). It is similar as PBSRAM to use burst mode transfer. SDRAM comes in 64-bit
168-pin DIMM and operates at 3.3V. AOpen is the first company to support dual-SDRAM DIMMs onboard (AP5V), from Q1 1996
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A memory space in Flash-ROM to simulate E
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PROM operation, AOpen motherboard uses Shadow E
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PROM for jumper-less and
battery-less design
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SIMM socket is only 72-pin, and is only single side. The golden finger signals on each side of PCB are identical. That is why it
was called Single In Line. SIMM is made by FPM or
EDO DRAM and supports 32-bit data. SIMM had been phased out on
current motherboard design.