486 ASIC II Motherboard Settings and Configuration
VTECH INDUSTRIES, INC.
486 ASIC II
Processor | 80486SX/80487SX/ODP486SX/80486DX/80486DX2 |
Processor Speed | 20/25/33/50(internal)/66(internal)MHz |
Chip Set | Unidentified |
Max. Onboard DRAM | 32MB |
Cache | 128KB |
BIOS | Unidentified |
Dimensions | 330mm x 218mm |
I/O Options | Floppy drive interface, game port, IDE interface, parallel port, serial ports (2), VGA port |
NPU Options | None |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Front panel connector | J2 | Serial port 2 | J11 |
IDE interface LED | J3 | IDE interface | J12 |
External battery | J4 | Parallel port | J13 |
Speaker | J5 | Game port | J14 |
Floppy drive interface | J9 | VGA port | J16 |
Serial port 1 | J10 | Riser Card | SL1 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
» | Factory configured - do not alter | JP6 | pins 2 & 3 closed |
» | Battery type select internal | JP7 | pins 1 & 2 closed |
Battert type select external | JP7 | pins 2 & 3 closed | |
» | CMOS memory normal operation | JP8 | pins 1 & 2 closed |
CMOS memory clear | JP8 | pins 2 & 3 closed | |
» | Factory configured - do not alter | JP9 | Closed |
» | Factory configured - do not alter | JP11 | pins 2 & 3 closed |
» | On board I/O enabled | JP17 | Closed |
On board I/O disabled | JP17 | Open | |
DRAM CONFIGURATION | ||
Size | Bank 0 | Bank 1 |
1MB | (4) 256K x 9 | NONE |
2MB | (4) 256K x 9 | (4) 256K x 9 |
2MB | (4) 512K x 9 | NONE |
4MB | (4) 512K x 9 | (4) 512K 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 |
128KB | (4) 32K x 8 |
128KB | (4) 32K x 9 |
CACHE JUMPER CONFIGURATION | ||||
Size | JP1 | JP2 | JP3 | JP4 |
128KB | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed | pins 1 & 2 closed |
128KB | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed | pins 2 & 3 closed |
CPU TYPE CONFIGURATION | |
Type | JP10 |
80486SX | pins 1 & 2 closed |
ODP486SX | pins 2 & 3 closed |
80487SX | pins 2 & 3 closed |
80486DX | pins 1 & 2 closed |
80486DX2 | pins 1 & 2 closed |
Note: There is a PQFP socket installed but the location is unidentifed. These CPU types are installed in the PGA socket. | |
CPU SPEED CONFIGURATION | |
Speed | JP5 |
20MHz | pins 1 & 2, 5 & 6 closed |
25MHz | pins 5 & 6 closed |
33MHz | pins 1 & 2, 3 & 4 closed |
50iMHz | pins 5 & 6 closed |
66iMHz | pins 1 & 2, 3 & 4 closed |
VRAM CONFIGURATION |
Note: The size of the VRAM memory is unidentified. |
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