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