DD & TT ENTERPRISE USA COMPANY
DT-423S4L (Revision C2 and earlier)
|
Processor |
80486SX/80487SX/80486DX |
|
Processor Speed |
20/25/33/50MHz |
|
Chip Set |
Symphony |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64/256/1024KB |
|
BIOS |
AMI/MR |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Speaker |
JP17 |
Turbo switch |
JP20 |
|
Turbo LED |
JP18 |
Power LED & keylock |
JP21 |
|
Reset switch |
JP19 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Password check disabled |
JP2 |
Open | |
|
Password check enabled |
JP2 |
Closed | |
|
Post-write buffer wait states select zero |
JP12 |
Closed | |
|
Post-write buffer wait state select one |
JP12 |
Open | |
|
Cache burst fill cycle select 2-1-1-1 |
JP16 |
Open | |
|
Cache burst fill cycle select 3-2-2-2 |
JP16 |
Closed | |
|
Note:The oscillator installed at X1 must match the speed of the CPU installed. (iOSC/1) | |||
|
DRAM CONFIGURATION | ||
|
Size |
Bank 0 |
Bank 1 |
|
1MB |
(4) 256K x 9 |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
|
4MB |
(4) 1M x 9 |
NONE |
|
5MB |
(4) 1M x 9 |
(4) 256K x 9 |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
17MB |
(4) 4M x 9 |
(4) 256K x 9 |
|
20MB |
(4) 4M x 9 |
(4) 1M x 9 |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CACHE CONFIGURATION | ||
|
Size |
Bank 0 |
TAG |
|
64KB |
(8) 8K x 8 |
(1) 8K x 8 |
|
256KB |
(8) 32K x 8 |
(1) 32K x 8 |
|
1024KB |
(8) 128K x 8 |
(1) 128K x 8 |
|
CACHE JUMPER CONFIGURATION | |||||
|
Size |
JP8 |
JP9 |
JP11 |
JP13 |
JP14 |
|
64KB |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
|
256KB |
2 & 3 |
2 & 3 |
2 & 3 |
1 & 2 |
1 & 2 |
|
1024KB |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Note:Pins designated should be in the closed position. | |||||
|
CPU TYPE CONFIGURATION | |||
|
Type |
JP3 |
JP4 |
JP5 |
|
80486SX |
Open |
Open |
pins 2 & 3 closed |
|
80487SX |
Closed |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
80486DX |
Closed |
pins 1 & 2 closed |
pins 1 & 2 closed |
|
CPU SPEED CONFIGURATION | ||
|
Speed |
JP7 |
JP10 |
|
iOSC/2 (use when CPU speed <= 33MHz) |
pins 2 & 3 closed |
Open |
|
iOSC/1 (use when CPU speed > 33MHz) |
pins 1 & 2 closed |
Closed |
|
SYSTEM READY CONFIGURATION | ||
|
Setting |
JP6 |
JP15 |
|
SYSTEM READY signal select extended |
pins 2 & 3 closed |
Closed |
|
SYSTEM READY signal select non-extended |
pins 1 & 2 closed |
Open |