ROBOTECH, INC.
COBRA-RT VER. A
Processor | CX486S/80486SX/CX487S/80487SX/80486DX/ODP486SX/80486DX2/ 80486DX4/Pentium Overdrive |
Processor Speed | 25/33/40/50(internal)/50/66(internal)MHz |
Chip Set | SIS |
Max. Onboard DRAM | 64MB |
Cache | 32/64/128/256KB |
BIOS | AMI |
Dimensions | 254mm x 220mm |
I/O Options | 32-bit VESA local bus slots (3) |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
External battery | JP8 | Reset switch | JP15D |
Speaker | JP15A | Turbo switch | JP15E |
Power LED & keylock | JP15B | +5vDC ground | JP15F |
Turbo LED | JP15C | 32-bit VESA local bus slots | SL1 - SL3 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | CMOS memory normal operation | JP8 | pins 2 & 3 closed |
CMOS memory clear | JP8 | pins 3 & 4 closed | |
» | Power good signal detect from power supply | JP11 | pins 1 & 2 closed |
Power good signal detect from board | JP11 | pins 2 & 3 closed | |
» | CPU type select 1 CPU on board (PQFP or PGA) | JP12 | pins 1 & 2 closed |
CPU type select 2 CPU on board (PGA enabled PQFP disabled) | JP12 | pins 2 & 3 closed | |
» | Green PC mode enabled | JP14 | pins 2 & 3 closed |
Green PC mode disabled | JP14 | pins 1 & 2 closed | |
» | VESA bus address type select asynchronous (40/50mhz CPU) | JP19 | pins 1 & 2 closed |
VESA bus address type select synchronous | JP19 | pins 2 & 3 closed | |
» | VESA bus data type select synchronous | JP20 | pins 1 & 2 closed |
VESA bus data type select asynchronous | JP20 | pins 2 & 3 closed | |
» | VGA card select normal | JP28 | pins 1 & 2 closed |
VGA card select Weitek Power 9000 VGA only | JP28 | pins 2 & 3 closed |
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) 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 |
32MB | (4) 4M x 9 | (4) 4M x 9 |
64MB | (4) 16M x 9 | NONE |
CACHE CONFIGURATION | |||
Size | Bank 0 | Bank 1 | TAG |
32KB | (4) 8K x 8 | NONE | (1) 8K x 8 |
64KB | (4) 8K x 8 | (4) 8K x 8 | (1) 8K x 8 |
128KB | (4) 32K x 8 | NONE | (1) 8K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 16K x 8 |
256KB | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | |||||
Size | JP5 | JP6 | JP7 | JP9 | JP10 |
32KB | 2 & 3 | Open | Open | Open | Open |
64KB | 1 & 2 | Open | Open | Closed | Open |
128KB | 2 & 3 | 2 & 3 | Closed | Closed | Open |
256KB | 1 & 2 | 1 & 2 | Closed | Closed | 2 & 3 |
256KB | 1 & 2 | 1 & 2 | Closed | Closed | 1 & 2 |
Note: Pins designated should be in the closed position. |
CPU TYPE CONFIGURATION | ||
Type | JP16 | JP17 |
CX486S | Open | pins 2 & 3 closed |
80486SX | Open | pins 2 & 3 closed |
80487SX | pins 2 & 3 closed | pins 1 & 2, 3 & 4 closed |
ODP486SX | pins 2 & 3 closed | pins 1 & 2, 3 & 4 closed |
80486DX/DX2/DX4 | pins 1 & 2 closed | pins 1 & 2, 3 & 4 closed |
Pentium Overdrive | pins 1 & 2 closed | pins 1 & 2, 3 & 4 closed |
CPU SPEED CONFIGURATION | ||||
Speed | JP21 | JP22 | JP23 | JP27 |
25MHz | Closed | Open | Closed | Open |
33MHz | Closed | Closed | Open | Open |
40MHz | Open | Open | Closed | Closed |
50iMHz | Closed | Open | Closed | Open |
50MHz | Open | Closed | Open | Closed |
66iMHz | Closed | Closed | Open | Open |
VESA BUS CLOCK CONFIGURATION | |||
Setting | JP25 (SL2) | JP26 (SL1) | JP29 (SL3) |
Synchronous | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
Asynchronous | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
CIRRUS LOGIC VIDEO CARD CONFIGURATION (VER. AB) | ||
CPU speed | JP19 | JP20 |
25MHz | pins 2 & 3 closed | pins 1 & 2 closed |
33MHz | pins 2 & 3 closed | pins 1 & 2 closed |
40MHz | pins 1 & 2 closed | pins 1 & 2 closed |
50iMHz | pins 2 & 3 closed | pins 1 & 2 closed |
50MHz | pins 1 & 2 closed | pins 1 & 2 closed |
66iMHz | pins 2 & 3 closed | pins 1 & 2 closed |
CIRRUS LOGIC VIDEO CARD CONFIGURATION (VER. AC) | ||
CPU speed | JP19 | JP20 |
25MHz | pins 2 & 3 closed | pins 1 & 2 closed |
33MHz | pins 2 & 3 closed | pins 1 & 2 closed |
40MHz | pins 1 & 2 closed | pins 2 & 3 closed |
50iMHz | pins 2 & 3 closed | pins 1 & 2 closed |
50MHz | pins 1 & 2 closed | pins 2 & 3 closed |
66iMHz | pins 2 & 3 closed | pins 1 & 2 closed |