AOpen AP5TC User Manual page 47

Hardware Installation
Following table are possible DRAM combinations that is NOT recommended:
SIMM SIMM
Data chip Parity chip
1M by 1 None
1M by 1 1M by 1
1M by 4 1M by 1
4M by 1 None
4M by 1 4M by 1
16M by 1 None
16M by 1 16M by 1
DIMM Bit size per
Data chip side
4M by 4 4Mx64
4M by 4 4Mx64
16M by 4 16Mx64
16M by 4 16Mx64
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.
2-30
Bit size Single/
per side Double
side
1Mx32 x1
1Mx36 x1
1Mx36 x2
4Mx32 x1
4Mx36 x1
16Mx32 x1
16Mx36 x1
Single/ Chip
Double side count
x1 16
x2 32
x1 16
x2 32
Chip SIMM
count size
32 4MB
36 4MB
24 8MB
32 16MB
36 16MB
32 64MB
36 64MB
DIMM size Recommended
32MB No
64MB No
128MB No
256MB No
Recommended
No
No
No
No
No
No
No