2 Casing, System Boards and Video
System Board, Switches and Jumpers
System Board, Switches and Jumpers
As mentioned in Chapter 1, there are three system board options for models 520 and 525. This section describes the Type A system board (part number
System Board Layout
Processor Socket | VESA Feature Connector |
Video
Cache Memory
Power
Connector 3.3 V
Battery
Status Panel VE
External Battery Connector (not used)
External Start Connector
Power Connector
CPU Core | 2 |
Frequency | 1 |
SW2 | |
| 3 |
| 2 |
| 1 |
| J6 |
Cache Jumper
J1
SW1
1 2 3
BANK | A1 | |
A2 | ||
A | ||
BANK | B1 | |
B2 | ||
B | ||
BANK | C1 | |
| ||
C | C2 |
Main Memory Sockets
J7
3 | 1 | CPU Bus Frequency | |
4 | 2 | JP4 | |
|
|
|
Serial B
Serial A
Parallel
Keyboard
Mouse
Floppy Disk Drive Connector |
| Backplane Connector |
| HDD Connector (IDE Channel 1) |
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