ICL
DRS M50/M55
| 
 Processor  | 
 80386SX  | 
| 
 Processor Speed  | 
 16/20MHz  | 
| 
 Chip Set  | 
 Unidentified  | 
| 
 Max. Onboard DRAM  | 
 8MB  | 
| 
 Cache  | 
 None  | 
| 
 BIOS  | 
 Unidentified  | 
| 
 Dimensions  | 
 330mm x 218mm  | 
| 
 I/O Options  | 
 Floppy drive interface, IDE interface, parallel port, serial ports (2), VGA port, riser slot  | 
| 
 NPU Options  | 
 80387SX  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 Reset switch  | 
 CN1  | 
 Serial port 1  | 
 P1  | 
| 
 LED’s & security lock  | 
 CN2  | 
 Parallel port  | 
 P2  | 
| 
 Keyboard/mouse connector  | 
 CN3  | 
 Serial port 2  | 
 P3  | 
| 
 IDE interface  | 
 JP1  | 
 VGA port (on VGA board)  | 
 P4  | 
| 
 Floppy drive interface  | 
 JP2  | 
 Riser slot  | 
 SL1  | 
| 
 USER CONFIGURABLE SETTINGS (MAINBOARD)  | |||
| 
 Function  | 
 Jumper  | 
 Position  | |
| 
 Password enabled  | 
 J3  | 
 Pins 1 & 2 closed  | |
| 
 Password disabled  | 
 J3  | 
 Pins 2 & 3 closed  | |
| 
 Security lock enabled  | 
 J9  | 
 Open  | |
| 
 Security lock disabled  | 
 J9  | 
 Closed  | |
| 
 DRAM CONFIGURATION  | ||||
| 
 Size  | 
 Bank 0  | 
 Bank 1  | 
 Bank 2  | 
 Bank 3  | 
| 
 2MB  | 
 (2) 1M x 9  | 
 None  | 
 None  | 
 None  | 
| 
 4MB  | 
 (2) 1M x 9  | 
 (2) 1M x 9  | 
 None  | 
 None  | 
| 
 8MB  | 
 (2) 1M x 9  | 
 (2) 1M x 9  | 
 (2) 1M x 9  | 
 (2) 1M x 9  | 
| 
 CPU SPEED CONFIGURATION  | ||
| 
 Speed  | 
 J4  | 
 J5  | 
| 
 16MHz  | 
 Pins 2 & 3 closed  | 
 Pins 2 & 3 closed  | 
| 
 20MHz  | 
 Pins 1 & 2 closed  | 
 Pins 1 & 2 closed  | 
| 
 USER CONFIGURABLE SETTINGS (VGA BOARD)  | |||
| 
 Function  | 
 Jumper  | 
 Position  | |
| 
 »  | 
 On board video enabled  | 
 J1  | 
 Closed  | 
| 
 On board video disabled  | 
 J1  | 
 Open  | |
| 
 »  | 
 VGA IRQ9 enabled  | 
 J4  | 
 Closed  | 
| 
 VGA IRQ9 disabled  | 
 J4  | 
 Open  | |
| 
 »  | 
 VGA BIOS enabled  | 
 SW1  | 
 Pins 1 & 2 closed  | 
| 
 VGA BIOS disabled  | 
 SW1  | 
 Pins 2 & 3 closed  | |