System Board Type 8639 (FRU 93H1758)

1 Power Connector (5Vdc)
2 Password Jumper (CMOS Clear)
3 Configuration Switch Set (SW1)
4 Diskette Connector
5 Battery
6 Power Connector (3.3Vdc)
7 Processor Socket
8 Cache Memory Module Connector
9 Power LED Connector
10 SIMM Connectors (Bank 1/2)
11 DIMM Connector (Bank 0)
12 Riser Connector
13 VESA Passthrough Connectors
14 Video Upgrade Sockets
15 Video Port
16 ECP/EPP Parallel Port
17 USB Ports (1/2)
18 Serial (A) Port
19 Mouse Port
20 Keyboard Port
21 Infrared Port

Processor Speed Switch Settings (SW1 1-4)

Speed	SW1-1	SW1-2	SW1-3	SW1-4
75MHz	Off	Off	On	On
90MHz	Off	Off	On	Off
100MHz	Off	Off	Off	On
120MHz	On	Off	On	Off
133MHz	On	Off	Off	On
150MHz	On	On	On	Off
166MHz	On	On	Off	On
200MHz	Off	On	Off	On

Additional Switch Settings (SW1 5-6)

Description	SW1-5	SW1-6
Normal Diskette Operation	N/A	Off (D)
Read-Only Diskette Operation	N/A	On

Password Jumper Settings

Jumper	Setting	Description
J15	1-2	Password Clear
J15	2-3 (D)	Password Enabled

Recommended combinations of memory module kits

Each bank must contain a matched pair of SIMMs having the same size and speed. The max. (SIMMs/DIMMs) memory supported is 160MB (192MB).

When installing SIMM memory, a matched-pair is first installed into Bank 1, and then into Bank 2.

1.  Industry standard 72-pin tin-led SIMMs and 168-pin gold-lead DIMMs are supported.
2.  Install only parity SIMMs/DIMMs to enable patrity.
3.  A mix of parity and non-parity SIMMs/DIMMs will configure as non-parity.

Type	Speed	Access Mode	Parity	Sizes Supported
SIMM	60 ns	EDO	N	4, 8, 16, 32 MB
SIMM	60 ns	FP	Y	8, 16, 32 MB
SIMM	70 ns	FP	N	4, 8, 16, 32 MB
SIMM	70 ns	FP	Y	4, 8 MB
DIMM	60 ns	EDO	N	8, 16, 32 MB
DIMM	60 ns	FP	Y	16, 32 MB

NOTE: FP = Fast Page / EDO = Extended Data Out

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