DIGITAL EQUIPMENT CORPORATION
DECPC 400MT
Processor |
80486DX/80486DX2 |
Processor Speed |
33/50(internal)/66(internal)MHz |
Chip Set |
Unidentified |
Video Chip Set |
Unidentified |
Maximum Onboard Memory |
64MB |
Maximum Video Memory |
1MB |
Cache |
None |
BIOS |
Unidentified |
Dimensions |
254mm x 218mm |
I/O Options |
CPU slot, parallel port, PS/2 mouse port, serial ports (2), VGA port |
NPU Options |
None |
CONNECTIONS | |||
Purpose |
Location |
Purpose |
Location |
Parallel port |
CN1 |
PS/2 mouse port |
CN5 |
VGA port |
CN2 |
External battery |
JP1 |
Serial port 2 |
CN3 |
CPU slot |
SL1 |
Serial port 1 |
CN4 |
USER CONFIGURABLE SETTINGS | |||
Function |
Label |
Position | |
» |
VGA IRQ9 disabled |
J13 |
Open |
VGA IRQ9 enabled |
J13 |
Closed | |
» |
On board video enabled |
J14 |
Closed |
On board video disabled |
J14 |
Open | |
» |
Local enabled |
J23 |
Pins 1 & 2 closed |
Local & ISA enabled |
J23 |
Pins 2 & 3 closed | |
» |
Parallel port unidirectional |
J25 |
Pins 1 & 2 closed |
Parallel port bidirectional |
J25 |
Pins 2 & 3 closed | |
» |
Reset switch enabled |
J27 |
Pins 1 & 2 closed |
Reset switch disabled |
J27 |
Pins 2 & 3 closed | |
» |
Factory configured - do not alter |
J28 |
Unidentified |
Monitor type select color |
J29 |
Closed | |
Monitor type select monochrome |
J29 |
Open | |
» |
CMOS memory normal operation |
J31 |
Pins 1 & 2 closed |
CMOS memory clear |
J31 |
Pins 2 & 3 closed |
DRAM CONFIGURATION | ||||
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
4MB |
(1) 1M x 36 |
None |
None |
None |
8MB |
(1) 1M x 36 |
(1) 1M x 36 |
None |
None |
12MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
None |
16MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 1M x 36 |
16MB |
(1) 4M x 36 |
None |
None |
None |
20MB |
(1) 1M x 36 |
(1) 4M x 36 |
None |
None |
24MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 4M x 36 |
None |
32MB |
(1) 4M x 36 |
(1) 4M x 36 |
None |
None |
40MB |
(1) 1M x 36 |
(1) 1M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
48MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
None |
64MB |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
(1) 4M x 36 |
Note: The location of banks 0, 1, 2 & 3 are unidentified. |
VIDEO MEMORY CONFIGURATION | ||
Size |
Bank 0 |
Bank 1 |
512KB |
512KB |
None |
1MB |
512KB |
512KB |
Note: The location of banks 0 & 1 are unidentified. |
VIDEO MEMORY JUMPER CONFIGURATION | |
Size |
J22 |
512KB |
Pins 1 & 2 closed |
1MB |
Pins 2 & 3 closed |