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 |