TANDY/RADIO SHACK
EGA/CGA GRAPHICS BOARD (250-3048)
|
Card Type |
Video card |
|
Video Processor |
6845 |
|
Maximum Onboard Memory |
256KB DRAM |
|
Data Bus |
8-bit ISA |
|
Video Types Supported |
Plantronics, EGA |
|
Highest Resolution Supported |
720 x 350 |
|
CONNECTIONS | |||
|
Function |
Label |
Function |
Label |
|
Not used |
J1 |
9-pin video out connector |
J3 |
|
Not used |
J2 |
Not used |
J4 |
|
USER CONFIGURABLE SETTINGS | |||
|
Setting |
Label |
Position | |
|
Factory configured - do not alter |
P1 |
Unidentified | |
|
EGA mode base I/O address set to 3D0h |
P3 |
Pins 1 & 2 closed | |
|
EGA mode base I/O address set to 2D0h |
P3 |
Pins 2 & 3 closed | |
|
Card will use EGA mode by default |
SW1/5 |
Off | |
|
Card will use CGA or monochrome mode by default |
SW1/5 |
On | |
|
Note:SW1/5 must always be turned off for Tandy SX and TX model mainboards. | |||
|
MONITOR TYPE SELECTION | |||||
|
Setting |
P2 |
SW1/1 |
SW1/2 |
SW1/3 |
SW1/4 |
|
Monochrome |
Pins 2 & 3 |
Off |
Off |
On |
Off |
|
CGA |
Pins 2 & 3 |
Off |
Off |
Off |
On |
|
EGA |
Pins 1 & 2 |
Off |
On |
On |
Off |
|
Note:Pins designated are in the closed position. | |||||