VTECH INDUSTRIES, INC.
486 SERIES (MINI CASE) ASIC II (3 VESA SLOTS)
|
Processor |
80486SX/80486DX/ODP486SX/80486DX2/Pentium Overdrive |
|
Processor Speed |
25/33/50(internal)/66(internal)MHz |
|
Chip Set |
Unidentified |
|
Max. Onboard DRAM |
32MB |
|
Cache |
128/256KB |
|
BIOS |
Unidentified |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
32-bit VESA local bus slots (3), PS/2 mouse connector |
|
NPU Options |
None |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Front panel connector |
J1 |
PS/2 mouse connector |
J27 |
|
External battery |
J3 |
Speaker |
J29 |
|
Processor power connector |
J10 |
32-bit VESA local bus slots |
SL1 - SL3 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
|
Battery type select internal |
JP8 |
pins 1 & 2 closed |
|
Battery type select external |
JP8 |
pins 2 & 3 closed | |
|
|
VESA card select supports write back cache |
JP10 |
pins 1 & 2 closed |
|
VESA card select does not support write back cache |
JP10 |
pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
JP14 |
pins 1 & 2 closed |
|
|
Monitor type select CGA/EGA/VGA |
JP19 |
Closed |
|
Monitor type select MDA/EGA/VGA |
JP19 |
Open | |
|
|
CMOS memory normal operation |
JP20 |
pins 1 & 2 closed |
|
CMOS memory clear |
JP20 |
pins 2 & 3 closed | |
|
|
Mouse IRQ12 disabled |
JP21 |
Open |
|
Mouse IRQ12 enabled |
JP21 |
Closed | |
|
|
CPU type select all |
JP32 |
Open |
|
CPU type select Pentium Overdrive |
JP32 |
pins 2 & 3 closed | |
|
|
Factory configured - do not alter |
JP33 |
pins 1 & 2 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 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
|
16MB |
(4) 4M x 9 |
NONE |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
|
CACHE CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
TAG (Bank 0) |
TAG (Bank 1) |
|
128KB |
(4) 32K x 8 |
NONE |
(2) 8K x 8 |
(2) 8K x 8 |
|
256KB |
(4) 32K x 8 |
(4) 32K x 8 |
(2) 8K x 8 |
(2) 8K x 8 |
|
CACHE JUMPER CONFIGURATION | |
|
Size |
JP2 |
|
128KB |
pins 1 & 2 closed |
|
256KB |
pins 2 & 3 closed |
|
CPU UPGRADE CONFIGURATION | |
|
Type |
JP1 |
|
None installed |
pins 1 & 2 closed |
|
SX/DX/DX2 series installed |
pins 2 & 3, 4 & 5 closed |
|
Overdrive series installed |
pins 1 & 2, 5 & 6 closed |
|
Note: There is a PQFP CPU installed but the location is unidentified. These CPU types are installed in the PGA socket. | |
|
CPU SPEED CONFIGURATION | |
|
Speed |
JP13 |
|
25MHz |
pins 5 & 6 closed |
|
33MHz |
pins 1 & 2, 3 & 4 closed |
|
50iMHz |
pins 5 & 6 closed |
|
66iMHz |
pins 1 & 2, 3 & 4 closed |
|
CPU SPEED CONFIGURATION | |
|
Speed |
JP11 |
|
2x |
pins 1 & 2 closed |
|
2.5x |
pins 2 & 3 closed |
|
3x |
Open |
|
BUS SPEED CONFIGURATION | |
|
CPU speed |
JP9 |
|
<= 33MHz |
pins 1 & 2 closed |
|
> 33MHz |
pins 2 & 3 closed |
|
KEYBOARD CONFIGURATION | |||||
|
Type |
JP12 |
JP15 |
JP16 |
JP17 |
JP18 |
|
Internal |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
1 & 2 |
|
External |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
2 & 3 |
|
Note: Pins designated should be in the closed position. | |||||