DD & TT ENTERPRISE USA COMPANY
DT ESCORT SYSTEM BOARD B
|
Processor |
80486SX/80486DX/ODP486SX/80486DX2 |
|
Processor Speed |
16/20/25/33/50(internal)/50/66(internal)MHz |
|
Chip Set |
OPTI |
|
Max. Onboard DRAM |
32MB |
|
Cache |
64KB/256KB |
|
BIOS |
AMI |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
Floppy drive interface, IDE interface parallel port, Proprietary EISA riser card slot, PS/2 mouse port, Serial port (2), VGA port, video feature connector |
|
NPU Options |
None |
|
CONNECTIONS |
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|
Purpose |
Location |
Purpose |
Location |
|
PS/2 mouse port |
J2 |
Reset switch |
J12A |
|
Serial port (COM 1) |
J3 |
Turbo switch |
J12B |
|
Serial port (COM 2) |
J4 |
Turbo LED |
J12C |
|
Parallel port |
J5 |
IDE interface LED |
J12D |
|
VGA port |
J6 |
Not used |
J12E |
|
Floppy drive interface |
J9 |
Speaker |
J13A |
|
Video feature connector |
J10 |
Power LED & keylock |
J13B |
|
IDE interface |
J11 |
Proprietary EISA riser card slot |
S1 |
|
USER CONFIGURABLE SETTINGS |
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|
Function |
Jumper/Switch |
Position |
|
|
» |
Floppy drive disabled |
E1 |
Pins 1 & 3 closed |
|
|
Floppy drive enabled |
E1 |
Pins 3 & 5 closed |
|
|
Floppy drive address select 3FO-3F7 |
E1 |
Pins 7 & 9 closed |
|
|
Floppy drive address select 370-377 |
E1 |
Pins 9 & 11 closed |
|
» |
IDE interface disabled |
E1 |
Pins 2 & 4 closed |
|
|
IDE interface enabled |
E1 |
Pins 4 & 6 closed |
|
|
IDE interface address select 3FO-3F7, 1FO-1F7 |
E1 |
Pins 8 & 10 closed |
|
|
IDE interface address select 370-377, 170-177 |
E1 |
Pins 10 & 12 closed |
|
» |
Onboard video enabled |
E2 |
Pins 1 & 2, 3 & 4, 5 & 6 closed |
|
|
Onboard video disabled |
E2 |
Pins 1 & 2, 3 & 4, 5 & 6 open |
|
» |
BIOS device select 1MB |
E6 |
Pins 1 & 2 closed |
|
|
BIOS device select 2MB |
E6 |
Pins 3 & 5 closed |
|
|
BIOS device select read only |
E6 |
Pins 2 & 4, 7 & 9, 8 & 10 closed |
|
|
BIOS device select read/write |
E6 |
Pins 4 & 6, 9 & 11, 10 & 12 |
|
» |
Chipset mode select 2x for 40MHz or less |
E7 |
Pins 3 & 5 closed |
|
|
Chipset mode select 1x for true 50MHz only |
E7 |
Pins 1 & 3 closed |
|
|
Chipset mode RDY1 set for 1X mode |
E7 |
Pins 4 & 6 closed |
|
|
Chipset mode RDY2 set for 2X mode |
E7 |
Pins 2 & 4 closed |
|
» |
Chipset mode burst rate select 3-2-2-2 |
E8 |
Pins 23 & 24 closed |
|
|
Chipset mode burst rate select 2-1-1-1 |
E8 |
Pins 23 & 24 open |
|
» |
Chipset mode write states select 0 wait state |
E8 |
Pins 25 & 26 closed |
|
|
Chipset mode write states select 1 wait state |
E8 |
Pins 25 & 26 open |
|
» |
Factory configured - do not alter |
E9 |
Pins 39 & 40 closed |
|
» |
PS/2 mouse enable at IRQ12 |
E10 |
Closed |
|
|
PS/2 mouse disable |
E10 |
Open |
|
» |
Factory configured do not alter |
E11 |
Unknown |
|
» |
CPU clock select mode 2X |
E12 |
Pins 2 & 3 closed |
|
|
CPU clock select mode 1 x for 486DX 50MHz |
E12 |
Pins 1 & 2 closed |
|
» |
Factory configured - do not alter |
E15 |
Pins 1 & 2 closed |
|
Note: If there is no monochrome Hercules card present then the system will automatically assume that address 378h is LPT1 and address 278h is LPT2 pins designated should be in the closed position. |
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|
DRAM CONFIGURATION |
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|
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) 256K x 9 |
(4) 1M x 9 |
|
8MB |
(4) 4M x 9 |
None |
|
16MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
17MB |
(4) 256K x 9 |
(4) 4M x 9 |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
SRAM CONFIGURATION |
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|
Size |
Cache |
Location |
TAG |
|
64KB |
(8) 8K x 8 |
Bank 0 & 1 |
(1) 8K x 4 |
|
256KB |
(8) 32K x 8 |
Bank 0 & 1 |
(1) 32K x 4 |
|
SRAM JUMPER CONFIGURATION |
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|
E9 |
64KB |
256KB |
|
Pins 1, 3, 5 |
Pins 1 & 3 closed |
Pins 3 & 5 closed |
|
Pins 2, 4, 6 |
Pins 2 & 4 closed |
Pins 2 & 4 closed |
|
Pins 7, 9, 11 |
Pins 7 & 9 closed |
Pins 9 & 11 closed |
|
Pins 8, 10, 12 |
Open |
Pins 8 & 10 closed |
|
Pins 13, 15, 17 |
Pins 15 & 17 closed |
Pins 15 & 17 closed |
|
Pins 14, 16, 18 |
Pins 14 & 16 closed |
Pins 14 & 16 closed |
|
Pins 19, 21, 23 |
Pins 21 & 23 closed |
Pins 21 & 23 closed |
|
Pins 20, 22, 24 |
Open |
Pins 20 & 22 closed |
|
Pins 26, 28, 30 |
Pins 26 & 28 closed |
Pins 26 & 28 closed |
|
Pins 31, 33, 35 |
Pins 33 & 35 closed |
Pins 33 & 35 closed |
|
Pins 32, 34, 36 |
Pins 34 & 36 closed |
Pins 34 & 36 closed |
|
Pins 37 & 38 |
Open |
Closed |
|
Note: For non-cache configuration pins 25, 26, & 27 should be in the closed position. |
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|
NON CACHE CONFIGURATION E16 |
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|
Pins 1-3-5 |
Pins 2-4-6 |
Pins 7-9-11 |
8 & 10, 11 & 12 |
Pins 13 & 14 |
15 & 16, 17 & 18 |
|
3 & 5 closed |
2 & 4 closed |
7 & 9 closed |
Closed |
Closed |
Open |
|
CPU TYPE CONFIGURATION |
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|
Jumper |
80486DX/80486DX2 |
80386SX/80486SLC |
|
E8/pins 1, 3, 5 |
Pins 1 & 3 closed |
Pins 3 & 5 closed |
|
E8/pins 2, 4, 6 |
Pins 2 & 4 closed |
Pins 4 & 6 closed |
|
E8/pins 7, 9, 11 |
Pins 7 & 9 closed |
Pins 9 & 11 closed |
|
E8/pins 8, 10, 12 |
Pins 8 & 10 closed |
Pins 10 & 12 closed |
|
E8/pins 13 & 14 |
Closed |
Open |
|
E8/pins 15 & 16 |
Open |
Closed |
|
E8/pins 17 & 18 |
Closed |
Open |
|
E8/pins 19 & 20 |
Closed |
Open |
|
E8/pins 21 & 22 |
Open |
Closed |
|
E13/pins 1 & 2, 3 & 4, 5 & 6 |
Pins 1 & 2, 3 & 4, 5 & 6 closed |
Pins 2 & 3 closed |
|
Note: settings for the 80386SX and 80486SLC are factory configured and should not be altered. |
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|
CPU SPEED CONFIGURATION |
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|
Speed |
U51 |
U52 |
Pins 1 & 2 |
Pins 3 & 4 |
Pins 5 & 6 |
Pins 7 & 8 |
|
16MHz |
Installed |
Empty |
Closed |
Open |
Closed |
N/A |
|
16MHz |
Empty |
Installed |
Closed |
Open |
Closed |
Closed |
|
20MHz |
Installed |
Empty |
Closed |
Open |
Open |
N/A |
|
20MHz |
Empty |
Installed |
Open |
Open |
Closed |
Closed |
|
25MHz |
Installed |
Empty |
Open |
Closed |
Closed |
N/A |
|
25MHz |
Empty |
Installed |
Closed |
Closed |
Open |
Closed |
|
33MHz |
Installed |
Empty |
Open |
Closed |
Open |
N/A |
|
33MHz |
Empty |
Installed |
Open |
Closed |
Open |
Closed |
|
40MHz |
Installed |
Empty |
Open |
Open |
Closed |
N/A |
|
40MHz |
Empty |
Installed |
Closed |
Open |
Open |
Closed |
|
50MHz |
Installed |
Empty |
Open |
Closed |
Closed |
N/A |
|
50MHz |
Empty |
Installed |
Closed |
Closed |
Open |
Closed |
|
SERIAL PORT A (J3) CONFIGURATION |
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|
COM |
I/O Address |
E4 |
E5 |
|
|
» |
COM1 |
3F8h |
Pins 3 & 5, 2 & 4, 7 & 8 |
Pins 3 & 5, 2 & 4, 7 & 8 |
|
|
COM3 |
3E8h |
Pins 1 & 3, 4 & 6, 7 & 8 |
Pins 1 & 3, 4 & 6, 7 & 8 |
|
|
COM4 |
2E8h |
Pins 3 & 5, 4 & 6, 7 & 8 |
Pins 3 & 5, 4 & 6 |
|
|
Disabled |
N/A |
Pins 1 & 3, 2 & 4 |
Pins 1 & 3, 2 & 4 |
|
Note: Pins designated should be in the closed position. |
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SERIAL PORT B (J4) CONFIGURATION |
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|
COM |
I/O Address |
E4 |
E5 |
|
|
» |
COM2 |
2F8h |
Pins 3 & 5, 2 & 4, 7 & 8 |
Pins 3 & 5, 2 & 4, 7 & 8 |
|
|
COM3 |
3E8h |
Pins 1 & 3, 4 & 6, 7 & 8 |
Pins 1 & 3, 4 & 6, 7 & 8 |
|
|
COM4 |
2E8h |
Pins 3 & 5, 4 & 6, 7 & 8 |
Pins 3 & 5, 4 & 6 |
|
|
Disabled |
N/A |
Pins 1 & 3, 2 & 4 |
Pins 1 & 3, 2 & 4 |
|
Note: Pins designated should be in the closed position. |
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|
PARALLEL PORT (J5) CONFIGURATION |
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|
COM |
IRQ |
I/O Address |
E3 |
|
|
» |
LPT1 |
IRQ7 |
3BCh |
Pins 3 & 5, 4 & 6, 7 & 8 |
|
|
LPT1 |
IRQ5 |
3BCh |
Pins 3 & 5, 4 & 6, 9 & 10 |
|
|
LPT2 |
IRQ7 |
378h |
Pins 3 & 5, 2 & 6, 7 & 8 |
|
|
LPT2 |
IRQ5 |
378h |
Pins 3 & 5, 2 & 6, 9 & 10 |
|
|
LPT3 |
IRQ7 |
278h |
Pins 1 & 3, 4 & 6, 7 & 8 |
|
|
LPT3 |
IRQ5 |
278h |
Pins 1 & 3, 4 & 6, 9 & 10 |
|
|
Disabled |
N/A |
N/A |
Pins 1 & 3, 2 & 4 |
|
Note: Pins designated should be in the closed position. |
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|
VIDEO MEMORY CONFIGURATION |
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|
Size |
Bank 0 |
Bank 1 |
|
512KB |
(4) 44256 |
NONE |
|
1024KB |
(4) 44256 |
(4) 44256 |
|
Note: Bank 0 is permanently soldered onto the board. |
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