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# TANDY/RADIO SHACK
ENHANCED GRAPHICS ADAPTER (250-4037)
Card Type Video card
Video Processor Unidentified
Maximum Onboard Memory 256KB DRAM
I/O Options Light pen port
Data Bus 8-bit ISA
Video Types Supported EGA
Highest Resolution Supported 640 x 350
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|---------------------+-------+----------------------+-------|
| Light pen port | J5 | 9-pin video out | P3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|---------------------------------------+-------+------------|
| » | Factory configured - do not alter | J4 | Pins 2 & 3 |
| | | | closed |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | SW1/5 | N/A |
|---+-----------------------------------+-------+------------|
| » | Factory configured - do not alter | SW1/6 | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY MODE SELECTION (EGA PRIMARY) |
|------------------------------------------------------------|
| Primary | Secondary | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|------------+------------+--------+--------+--------+-------|
| Monochrome | None | Off | Off | On | Off |
|------------+------------+--------+--------+--------+-------|
| Lo-res CGA | None | On | Off | Off | On |
|------------+------------+--------+--------+--------+-------|
| Hi-res CGA | None | Off | Off | Off | On |
|------------+------------+--------+--------+--------+-------|
| Lo-res EGA | None | On | On | On | Off |
|------------+------------+--------+--------+--------+-------|
| Hi-res EGA | None | Off | On | On | Off |
|------------+------------+--------+--------+--------+-------|
| None | Monochrome | Off | On | On | On |
|------------+------------+--------+--------+--------+-------|
| Lo-res CGA | Monochrome | On | On | On | On |
|------------+------------+--------+--------+--------+-------|
| Hi-res CGA | Monochrome | Off | On | On | On |
|------------+------------+--------+--------+--------+-------|
| Lo-res EGA | Monochrome | On | On | On | On |
|------------+------------+--------+--------+--------+-------|
| Hi-res EGA | Monochrome | Off | Off | On | On |
|------------+------------+--------+--------+--------+-------|
| Monochrome | Lo-res CGA | On | Off | On | Off |
|------------+------------+--------+--------+--------+-------|
| Monochrome | Hi-res CGA | Off | Off | On | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DISPLAY MODE SELECTION (EGA SECONDARY) |
|------------------------------------------------------------|
| Primary | Secondary | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|------------+------------+--------+--------+--------+-------|
| Monochrome | None | Off | On | On | On |
|------------+------------+--------+--------+--------+-------|
| Monochrome | Lo-res CGA | On | On | On | On |
|------------+------------+--------+--------+--------+-------|
| Monochrome | Hi-res CGA | Off | On | On | On |
|------------+------------+--------+--------+--------+-------|
| Monochrome | Lo-res EGA | On | Off | On | On |
|------------+------------+--------+--------+--------+-------|
| Monochrome | Hi-res EGA | Off | Off | On | On |
|------------+------------+--------+--------+--------+-------|
| Lo-res CGA | Monochrome | On | On | Off | On |
|------------+------------+--------+--------+--------+-------|
| Hi-res CGA | Monochrome | Off | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR TYPE SELECTION |
|------------------------------------------------------------|
| Setting | J2 | SW1/7 | SW1/8 |
|----------------+-------------------+-----------+-----------|
| Monochrome | Pins 2 & 3 closed | On | Off |
|----------------+-------------------+-----------+-----------|
| CGA | Pins 2 & 3 closed | On | Off |
|----------------+-------------------+-----------+-----------|
| 400-line 25MHz | Pins 2 & 3 closed | Off | On |
|----------------+-------------------+-----------+-----------|
| EGA | Pins 1 & 2 closed | On | Off |
+------------------------------------------------------------+