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Step 1, remove the 4 mini jumpers from J1.
JP50,JP51
Step 2, insert the DX4DB 3.3V daughter board on to the 8 pin header (J1) and the 10 pin IDC socket (JP50+JP51).
Setp 3, refer to the above CPU Type Select Table to choose the correct setting of the 3.3V CPU
2.4
SIMM MEMORY Configuration
This motherboard can work with various types of SIMM module. It's auto-banking feature means that you do not have
to set any jumpers to designate the bank, size or type of SIMM - just install the modules and the motherboard will
auto-configure on booting up.
This motherboard supports 72-Pin SIMM module.
·
72-Pin
These are 32-bit modules (sometimes referred to as 'x32' or 'x36'). Because they are fully 32-Bit you only
need to use one piece. Therefore this type of SIMM occupies one bank on its own. The exception to this rule is
that some 72-Pin modules are double sided and will occupy two banks. The table below shows you what types
of SIMM are single or dual banked.
RAS Signals - The UMC chipset of this motherboard supports 4 RAS signals.
to one bank. Therefore this motherboard can support 4 banks.
Some 72-pin SIMM modules are double-bank as mentioned above . This means that although they only occupy one
socket, they require 2 RAS signals. To help you with identifying the type of 72-pin module your system uses please
refer to the table below.
SIMM TYPE
256k x 32 (Non-Parity)
DX4DB 3.3V/3.45V Daughter Board
JP3
8 pin IDC socket
J1
8 pin header
RAS Signals used.
For 1 Pc SIMM
one - single bank
J1
TOTAL MEMORY
For 1 Pc SIMM
1 MB
17
JP2+JP4+JP5
10 pin header
JP50,+JP51
10 pin IDCsocket
Each of these RAS signals is equivalent
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