WESTERN DIGITAL CORPORATION
BASIC EGA
| 
 Category  | 
 Video  | 
| 
 Video Types Supported  | 
 EGA/Monochrome  | 
| 
 Video Processor  | 
 WD PEGA1A  | 
| 
 Highest Resolution Supported  | 
 800 x 600  | 
| 
 Data Bus Type  | 
 8-bit ISA  | 
| 
 Memory Type  | 
 DRAM  | 
| 
 Maximum Onboard Memory  | 
 256KB  | 
| 
 CONNECTIONS  | |||
| 
 Purpose  | 
 Location  | 
 Purpose  | 
 Location  | 
| 
 15-pin analog video port  | 
 CN1  | 
 Light pen connector  | 
 CN4  | 
| 
 Composite video connectors  | 
 CN2 & CN3  | 
 VGA feature connector  | 
 CN5  | 
| 
 MONITOR STARTUP CONFIGURATION  | |
| 
 Power Up Default  | 
 SW1/5  | 
| 
 EGA operation  | 
 Off  | 
| 
 Compatible operation  | 
 On  | 
| 
 Note: Compatible operation further defaults to CGA/Plantronics operation if standard or enhanced RGB monitor is connected, or MDA/Hercules operation if monochrome monitor is connected.  | |
| 
 MONITOR TYPE SELECTION  | |||||
| 
 Type  | 
 JP2  | 
 SW1/1  | 
 SW1/2  | 
 SW1/3  | 
 SW1/4  | 
| 
 Monochrome  | 
 Pins 1 & 2 closed  | 
 Off  | 
 Off  | 
 On  | 
 Off  | 
| 
 Standard RGB  | 
 Pins 1 & 2 closed  | 
 Off  | 
 Off  | 
 Off  | 
 On  | 
| 
 Enhanced RGB  | 
 Pins 2 & 3 closed  | 
 Off  | 
 On  | 
 On  | 
 Off  | 
| 
 TWO MONITOR CONFIGURATION (BASIC EGA PRIMARY, IBM MONOCHROME SECONDARY)  | ||||
| 
 Primary Mode  | 
 SW1/1  | 
 SW1/2  | 
 SW1/3  | 
 SW1/4  | 
| 
 40 column on standard RGB  | 
 On  | 
 Off  | 
 Off  | 
 On  | 
| 
 80 column on standard RGB  | 
 Off  | 
 Off  | 
 Off  | 
 On  | 
| 
 200 lines on enhanced RGB  | 
 On  | 
 On  | 
 On  | 
 Off  | 
| 
 350 lines on enhanced RGB  | 
 Off  | 
 On  | 
 On  | 
 Off  | 
| 
 TWO MONITOR CONFIGURATION (IBM MONOCHROME PRIMARY, BASIC EGA SECONDARY)  | ||||
| 
 Primary Mode  | 
 SW1/1  | 
 SW1/2  | 
 SW1/3  | 
 SW1/4  | 
| 
 40 column on standard RGB  | 
 On  | 
 On  | 
 On  | 
 On  | 
| 
 80 column on standard RGB  | 
 Off  | 
 On  | 
 On  | 
 On  | 
| 
 200 lines on enhanced RGB  | 
 On  | 
 Off  | 
 On  | 
 On  | 
| 
 350 lines on enhanced RGB  | 
 Off  | 
 Off  | 
 On  | 
 On  | 
| 
 TWO MONITOR CONFIGURATION (BASIC EGA PRIMARY, IBM COLOR/GRAPHICS SECONDARY)  | ||||
| 
 Primary Mode  | 
 SW1/1  | 
 SW1/2  | 
 SW1/3  | 
 SW1/4  | 
| 
 40 column on RGB/composite  | 
 On  | 
 Off  | 
 On  | 
 Off  | 
| 
 80 column on RGB/composite  | 
 Off  | 
 Off  | 
 On  | 
 Off  | 
| 
 TWO MONITOR CONFIGURATION (IBM COLOR/GRAPHICS PRIMARY, BASIC EGA SECONDARY)  | ||||
| 
 Primary Mode  | 
 SW1/1  | 
 SW1/2  | 
 SW1/3  | 
 SW1/4  | 
| 
 40 column on RGB/composite  | 
 On  | 
 On  | 
 Off  | 
 On  | 
| 
 80 column on RGB/composite  | 
 Off  | 
 On  | 
 Off  | 
 On  | 
| 
 FACTORY CONFIGURED - DO NOT ALTER  | |
| 
 Jumper  | 
 Position  | 
| 
 JP1  | 
 Pins 1 & 2 closed  |