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 |
|
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 | |
| » |
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 1 |
None |
None |
|
192KB |
(8) 64K x 1 |
(8) 64K x 1 |
(8) 64K x 1 |
None |
|
256KB |
(8) 64K x 1 |
(8) 64K x 1 |
(8) 64K x 1 |
(8) 64K x 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. |