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# AST RESEARCH, INC.
MEGAPLUS (REV. 6)
Card Type Multi-I/O card
Chip Set Unidentified
Maximum Onboard Memory 512KB DRAM (with MegaPak option)
I/O Options Parallel port, serial ports (2)
Data Bus 8-bit ISA
Floppy drives supported None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|-----------------+-------+--------------------------+-------|
| Serial port 1 | J1 | DCE connector | J4 |
|-----------------+-------+--------------------------+-------|
| Parallel port | J2 | Daughter board connector | J5 |
|-----------------+-------+--------------------------+-------|
| DTE connector | J3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|--------------------------------+-------+-------------------|
| ยป | DTE pin select | JP1 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| | DCE pin select | JP1 | Pins 2 & 3 closed |
|---+----------------------------+-------+-------------------|
| | COM 1 enabled | JP3 | Pins 3 & 4 closed |
|---+----------------------------+-------+-------------------|
| | COM 2 enabled | JP3 | Pins 5 & 6 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|-------+-------------+------------+------------+------------|
| 64KB | (8) 64K x 1 | None | None | None |
|-------+-------------+------------+------------+------------|
| 128KB | (8) 64K x 1 | (8) 64K x | None | None |
| | | 1 | | |
|-------+-------------+------------+------------+------------|
| 192KB | (8) 64K x 1 | (8) 64K x | (8) 64K x | None |
| | | 1 | 1 | |
|-------+-------------+------------+------------+------------|
| 256KB | (8) 64K x 1 | (8) 64K x | (8) 64K x | (8) 64K x |
| | | 1 | 1 | 1 |
+------------------------------------------------------------+
+-------------------------------------------------------------+
| INTERRUPT CONFIGURATION |
|-------------------------------------------------------------|
| IRQ |JP4/A |JP4/B |JP4/C |JP4/D |JP4/E |JP4/F |JP4/G |JP4/H |
|-----+------+------+------+------+------+------+------+------|
|IRQ2S|Closed| Open | Open | Open | Open | Open | Open | Open |
|-----+------+------+------+------+------+------+------+------|
|IRQ2C| Open |Closed| Open | Open | Open | Open | Open | Open |
|-----+------+------+------+------+------+------+------+------|
|IRQ3S| Open | Open |Closed| Open | Open | Open | Open | Open |
|-----+------+------+------+------+------+------+------+------|
|IRQ3 | Open | Open | Open |Closed| Open | Open | Open | Open |
|-----+------+------+------+------+------+------+------+------|
|IRQ4 | Open | Open | Open | Open |Closed| Open | Open | Open |
|-----+------+------+------+------+------+------+------+------|
|IRQ4C| Open | Open | Open | Open | Open |Closed| Open | Open |
|-----+------+------+------+------+------+------+------+------|
|IRQ5C| Open | Open | Open | Open | Open | Open |Closed| Open |
|-----+------+------+------+------+------+------+------+------|
|IRQ5S| Open | Open | Open | Open | Open | Open | Open |Closed|
+-------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| Note: The purpose of JP2 is unidentified. |
+------------------------------------------------------------+