Xycom XVME-678 Manual page 79

4.2.1
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XVME-678/688 Manual
July 1994
The XVME-678/688 is available with 0, 1, or 4 Mbytes of DRAM, and can be expanded to 2, 10, or 16
Mbytes of DRAM.
1 Mbyte M2nvry
The 1 Mbyte DRAM is divided into 640 and 384 Kbyte blocks for CPU accesses when the Shadow RAM
option is not enabled. The 640 Kbyte block resides from 000000-09FFFF; the 384 Kbyte block from
100000-15FFFF. If the shadow RAM option is enabled, the DRAM is reduced to the lower 640 Kbytes
of DRAM.
2 Mbytes M2nvry
The 2 Mbyte version has 1.64 Mbytes of DRAM divided into 640 Kbyte and 1 Mbyte blocks. The
additional 384 Kbytes of DRAM are dedicated for Shadow RAM and are not relocatable. Because this
configuration uses only two SIMMs, there is no interleaving. This configuration tends to be less optimal
for performance than the other memory configurations.
4
Mbytes
Menvry
The 4 Mbyte version has 3.64 Mbytes of DRAM divided into 640 Kbyte and 3 Mbyte blocks. The
additional 384 Kbytes of DRAM are dedicated for Shadow RAM and are not relocatable.
10 Mbytes M2nvry
The 10 Mbyte version has 9.64 Mbytes of DRAM divided into 640 Kbyte and 9 Mbyte blocks. The
additional 384 Kbytes of DRAM are dedicated for Shadow RAM and are not relocatable. Because this
configuration uses two SIMMs of different sizes, there is no interleaving. This configuration tends to be
less optimal for performance than the others.
16 Mbytes Menvry
The 16 Mbyte version has 15.64 Mbytes of DRAM divided into 640 Kbyte and 15 Mbyte blocks. The
additional 384 Kbytes of DRAM are dedicated for Shadow RAM and are not relocatable.
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