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# AST RESEARCH, INC.
AST-3G PLUS (202104-001)
Category Video
Video Types Supported CGA, EGA, Monochrome
Video Processor Western Digital
Highest Resolution Supported 720 X 348
Data Bus Type 8-bit ISA
Memory Type DRAM
Maximum Onboard Memory 256KB
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-------------------+----------+------------------+----------|
| 15-pin analog | CN1 | Optional | P3 |
| video port | | parallel port | |
|-------------------+----------+------------------+----------|
| RCA video port 1 | RCA1 | 32-pin feature | P4 |
| | | connector | |
|-------------------+----------+------------------+----------|
| RCA video port 2 | RCA2 | Parallel port | U25 |
| | | upgrade socket | |
|-------------------+----------+------------------+----------|
| Light pen | P2 | Plus option | U30 |
| connector | | socket | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MODE CONFIGURATION |
|------------------------------------------------------------|
| Type | Resolution | SW1/1 | SW1/2 |SW1/3 |SW1/4 |SW2 |
|------------+------------+-------+-------+------+------+----|
|»| EGA | 640 x 350 | Off | On | On | Off |Off |
|-+----------+------------+-------+-------+------+------+----|
| | EGA | 320 x 200 | Off | On | On | Off | On |
|-+----------+------------+-------+-------+------+------+----|
| | CGA | 320 x 200 | On | On | On | Off |Off |
|-+----------+------------+-------+-------+------+------+----|
| |Monochrome| 640 x 350 | Off | Off | On | Off |Off |
|-+----------+------------+-------+-------+------+------+----|
| |Monochrome| 720 x 348 | Off | Off | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MONITOR TYPE |
|------------------------------------------------------------|
| Type | E5 |
|----------------------------+-------------------------------|
| » | EGA | Pins 1 & 2 closed |
|---+------------------------+-------------------------------|
| | CGA | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | E1 |
|---------------------------------+--------------------------|
| » | 64KB | Open |
|------+--------------------------+--------------------------|
| | 256KB | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT I/O ADDRESS SELECT |
|------------------------------------------------------------|
| Address | E4 |
|----------------------------+-------------------------------|
| » | 378h | Pins 1 & 2 closed |
|-----+----------------------+-------------------------------|
| | 278h | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PARALLEL PORT INTERRUPT SELECT |
|------------------------------------------------------------|
| IRQ | E6 |
|----------------------------+-------------------------------|
| » | IRQ7 | Pins 2 & 3 closed |
|----+-----------------------+-------------------------------|
| | IRQ5 | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FACTORY CONFIGURED SETTINGS |
|------------------------------------------------------------|
| Jumper | Setting |
|----------------------------+-------------------------------|
| E2 | Closed |
|----------------------------+-------------------------------|
| E3 | Pins 1 & 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| Note:The AST 3G-Plus comes equipped with 64KB of memory |
| and is upgradeable to 256KB. The type of memory used and |
| the location of Bank 0(the first 64KB) is unspecified in |
| manufacturer documentation. Upgrade kits are available |
| through AST. |
+------------------------------------------------------------+