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# NCR CORPORATION
CLASS 3421
Processor 80386SX
Processor Speed 20MHz
Chip Set NCR
Max. Onboard 8MB
DRAM
Cache None
BIOS AMI
Dimensions 381mm x 254mm
I/O Options Serial port, parallel port, PS/2 mouse port,
SCSI interface (2), floppy drive interface,
CPU upgrade slot, proprietary SIMM sockets (3)
NPU Options 80387SX
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| Video controller | CN1 | IDE/floppy drive | CN8 |
| | | power | |
|------------------+----------+-------------------+----------|
| Internal SCSI | CN2 | FS1 header | JP1 |
| interface | | | |
|------------------+----------+-------------------+----------|
| External SCSI | CN3 | SCSI terminating | R1, R2, |
| interface | | resistors | R3 |
|------------------+----------+-------------------+----------|
| Serial port | CN4 | Proprietary SIMM | S1, S2, |
| | | socket | S3 |
|------------------+----------+-------------------+----------|
| Parallel port | CN5 | MCA slot | S4, S5, |
| | | | S6, S7 |
|------------------+----------+-------------------+----------|
| PS/2 mouse port | CN6 | CPU upgrade slot | S8 |
|------------------+----------+-------------------+----------|
| Floppy drive | CN7 | | |
| interface | | | |
|------------------------------------------------------------|
| Note: Pin 1 locations unverified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | S1 | S2 | S3 |
|---------+-----------+------------+------------+------------|
| 2MB | 2MB | NONE | NONE | NONE |
|---------+-----------+------------+------------+------------|
| 4MB | 2MB | (1) 1M x | NONE | NONE |
| | | 18 | | |
|---------+-----------+------------+------------+------------|
| 6MB | 2MB | (1) 1M x | (1) 1M x | NONE |
| | | 18 | 18 | |
|---------+-----------+------------+------------+------------|
| 8MB | 2MB | (1) 1M x | (1) 1M x | (1) 1M x |
| | | 18 | 18 | 18 |
|------------------------------------------------------------|
| Note: Bank 0 factory installed and is not configurable. |
| Locations and individual chip sizes for Bank 0 inside DRAM |
| area are unknown. |
+------------------------------------------------------------+