User Guide

Hardware Installation

2-27

Following table are possible DRAM combinations that is NOT recommended:

SIMM

Data chip

SIMM

Parity chip

Bit size

per side

Single/

Double

side

Chip

count

SIMM

size

Recommended

1M by 1 None 1Mx32 x1 32 4MB No

1M by 1 1M by 1 1Mx36 x1 36 4MB No

1M by 4 1M by 1 1Mx36 x2 24 8MB No

4M by 1 None 4Mx32 x1 32 16MB No

4M by 1 4M by 1 4Mx36 x1 36 16MB No

16M by 1 None 16Mx32 x1 32 64MB No

16M by 1 16M by 1 16Mx36 x1 36 64MB No

DIMM

Data chip

Bit size per

side

Single/

Double side

Chip

count

DIMM size Recommended

4M by 4 4Mx64 x1 16 32MB No

4M by 4 4Mx64 x2 32 64MB No

16M by 4 16Mx64 x1 16 128MB No

16M by 4 16Mx64 x2 32 256MB No

Memory error checking is supported by parity check. To use parity check you need

36 bit SIMM (32 bit data + 4 bit parity), which are automatically detected by BIOS.

Tip: The parity mode uses 1 parity bit for each byte,

normally it is even parity mode, that is, each time the

memory data is updated, parity bit will be adjusted to have

even count "1" for each byte. When next time, if memory is

read with odd number of "1", the parity error is occurred

and this is called single bit error detection.