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# AST RESEARCH, INC.
CUPID Desktop ISA 486/25 & 486/33 (ver. 1)
Model 202356-004 (Revision D and later)
Processor 80486DX (on external CPU/Memory module)
Processor Speed 25/33MHz
Chip Set AST
Max. Onboard None (16MB on external CPU/Memory module)
DRAM
SRAM Cache None
BIOS AST
Dimensions 330mm x 218mm
I/O Options 32-bit external CPU/Memory module slot,
32-bit external Memory module slot (2),
floppy drive interface, IDE interface,
parallel port, serial port (2), SMART
expansion/16-bit ISA expansion slots (3)
NPU Options 4167 (on external CPU/Memory module)
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------+----------+----------------------+----------|
| Serial port 1 | CN1 | External battery | P8 |
| (COM1) | | | |
|---------------+----------+----------------------+----------|
| Parallel port | CN2 | IDE interface | P11 |
|---------------+----------+----------------------+----------|
| IDE interface | J14 | SMART | S1, S2 & |
| LED | | expansion/16-bit ISA | S3 |
|---------------+----------+----------------------+----------|
| Serial port 2 | P2 | 32-bit external | S4 |
| (COM2) | | CPU/Memory module | |
|---------------+----------+----------------------+----------|
| Floppy drive | P3 | 32-bit external | S5 |
| interface (A: | | Memory module slot | |
| and B:) | | | |
|---------------+----------+----------------------+----------|
| Third floppy | P4 | 32-bit external | S6 |
| drive | | Memory module slot | |
| interface | | | |
|---------------+----------+----------------------+----------|
| Front panel | P5 | Optional ROM (even) | U12 |
| switches & | | | |
| LEDs | | | |
|---------------+----------+----------------------+----------|
| Speaker | P6 | Optional ROM (odd) | U38 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-----------------------------------+--------+---------------|
| » | Password check enabled | E1 | pins 2 & 3 |
| | | | closed |
|---+-------------------------------+--------+---------------|
| | Password check disabled | E1 | pins 1 & 2 |
| | | | closed |
|---+-------------------------------+--------+---------------|
| » | POST select normal operation | E2 | open |
|---+-------------------------------+--------+---------------|
| | POST select continuous loop | E2 | closed |
|---+-------------------------------+--------+---------------|
| » | Keyboard select installed | E3 | open |
|---+-------------------------------+--------+---------------|
| | Keyboard select not installed | E3 | closed |
+------------------------------------------------------------+
IMG IMG 2
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|-----------------------------------+-----------+------------|
| » | Parity check enabled | E1 | closed |
|-----+-----------------------------+-----------+------------|
| | Parity check disabled | E1 | open |
|------------------------------------------------------------|
| Note:AST CPU/Memory module part number is 202361-002, |
| 202361-005, or 202361-006 for 25MHz |
| |
| systems or 202361-004 or 202361-007 for 33MHz systems. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|---------------+----------------------+---------------------|
| 2MB | (2) 1M x 9 | NONE |
|---------------+----------------------+---------------------|
| 4MB | (2) 1M x 9 | (2) 1M x 9 |
|---------------+----------------------+---------------------|
| 8MB | (2) 4M x 9 | NONE |
|---------------+----------------------+---------------------|
| 10MB | (2) 1M x 9 | (2) 4M x 9 |
|---------------+----------------------+---------------------|
| 16MB | (2) 4M x 9 | (2) 4M x 9 |
|------------------------------------------------------------|
| Notes:128KB of DRAM is reserved for System and VGA BIOS |
| shadowing and cannot be disabled. |
| |
| Up to two of the following memory boards may be installed |
| in addition to the CPU/Memory |
| |
| module: AST part numbers 202275-002, 202275-004, |
| 202275-006, 202387-001, |
| |
| or 202387-005. |
+------------------------------------------------------------+