FORTRESS SYSTEMS INTERNATIONAL
SPECTRUM II 486 PCI/ISA/VESA
|
Processor |
CX486SX/AM486SX/80486SX/CX486DX/AM486DX/80486DX/ CX486DX2/AM486DX2/80486DX2/CX486DX4/AM486DX4/80486DX4 |
|
Processor Speed |
25/33/40/50(internal)/66(internal)/75(internal)/100(internal)MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
None |
|
Maximum Onboard Memory |
64MB |
|
Maximum Video Memory |
None |
|
Cache |
128/256/512KB |
|
BIOS |
AMI/Award/MR BIOS |
|
Dimensions |
254mm x 218mm |
|
I/O Options |
32-bit VESA local bus slots (2), 32-bit PCI slots (4) |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Turbo switch |
J1 |
Power LED & keylock |
J5 |
|
Turbo LED |
J2 |
32-bit PCI slots |
PC1 PC4 |
|
Speaker |
J3 |
32-bit VESA local bus slots |
SL1 & SL2 |
|
Reset switch |
J4 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
CMOS memory normal operation |
JP2 |
Pins 1 & 2 closed |
|
CMOS memory clear |
JP2 |
Pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
JP10A |
Open |
|
|
Factory configured - do not alter |
JP10B |
Pins 1 & 2 closed |
|
|
Factory configured - do not alter |
JP10C |
Pins 2 & 3 closed |
|
|
Factory configured - do not alter |
JP10D |
Open |
|
|
Factory configured - do not alter |
JP10E |
Open |
|
|
Factory configured - do not alter |
JP38A |
Open |
|
|
Factory configured - do not alter |
JP38B |
Pins 1 & 2 closed |
|
|
Factory configured - do not alter |
JP38C |
Pins 2 & 3 closed |
|
IDE type select PCI IDE |
JP38D |
Closed | |
|
IDE type select VESA IDE |
JP38D |
Open | |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
1MB |
(1) 256K x 36 |
None |
None |
None |
|
2MB |
(1) 256K x 36 |
(1) 256K x 36 |
None |
None |
|
2MB |
(1) 512K x 36 |
None |
None |
None |
|
3MB |
(1) 256K x 36 |
(1) 512K x 36 |
None |
None |
|
3MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
None |
|
4MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
|
4MB |
(1) 512K x 36 |
(1) 512K x 36 |
None |
None |
|
4MB |
(1) 1M x 36 |
None |
None |
None |
|
5MB |
(1) 256K x 36 |
(1) 1M x 36 |
None |
None |
|
5MB |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 256K x 36 |
(1) 512K x 36 |
|
6MB |
(1) 512K x 36 |
(1) 1M x 36 |
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) 2M x 36 |
(1) 2M x 36 |
None |
None |
|
DRAM CONFIGURATION (CONT) | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
16MB |
(1) 4M x 36 |
None |
None |
None |
|
32MB |
(1) 4M x 36 |
(1) 4M x 36 |
None |
None |
|
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: Board accepts x 32 SIMMs. | ||||
|
DRAM JUMPER CONFIGURATION | |
|
Setting |
JP23 |
|
1 BK installed |
Pins 1 & 2 closed |
|
2 BK installed |
Pins 2 & 3 closed |
|
CACHE CONFIGURATION | ||
|
Size |
Bank 0 |
TAG |
|
128KB |
(4) 32K x 8 |
(1) 8K x 8 |
|
256KB |
(2) 64K x 32 |
(1) 32K x 8 |
|
512KB |
(4) 128K x 8 |
(1) 32K x 8 |
|
CACHE JUMPER CONFIGURATION | |
|
Size |
JP20 |
|
128KB |
Pins 1 & 2 closed |
|
256KB |
Pins 1 & 2 closed |
|
512KB |
Pins 2 & 3 closed |
|
CPU SPEED SELECTION | |||
|
Speed |
JP7 |
JP27 |
JP28 |
|
25MHz |
Closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
|
33MHz |
Open |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
|
50iMHz |
Closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
|
66iMHz |
Open |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
|
75iMHz |
Closed |
Pins 1 & 2 closed |
Pins 2 & 3 closed |
|
100iMHz |
Open |
Pins 2 & 3 closed |
Pins 1 & 2 closed |
|
CPU TYPE SELECTION | |
|
Type |
JP11 |
|
Cyrix |
Pins 2 & 3 closed |
|
AMD |
Pins 1 & 2 closed |
|
Intel |
Pins 1 & 2 closed |
|
CPU TYPE SELECTION | |
|
Type |
JP99 |
|
All CPU types |
Closed |
|
DX4 only |
Open |
|
FLASH BIOS VOLTAGE SELECTION | ||
|
Voltage |
JP12 |
JP80 |
|
5v |
Pins 1 & 2 closed |
Pins 1 & 3, 2 & 4 closed |
|
12v |
Pins 2 & 3 closed |
Pins 3 & 5, 4 & 6 closed |