UNIDENTIFIED
HT12HS
Processor | 80286 |
Processor Speed | 12/16/20MHz |
Chip Set | VLSI |
Max. Onboard DRAM | 4MB |
Cache | None |
BIOS | AMI/Eurosoft/Quadtel |
Dimensions | 220mm x 220mm |
I/O Options | None |
NPU Options | 80287 |
CONNECTIONS | |||
Purpose | Location | Purpose | Location |
Auxiliary keyboard connector | JP1 | Turbo switch | JP10 |
External battery | JP2 | Reset switch | JP11 |
Speaker | JP8 | Power LED & keylock | JP12 |
Turbo LED | JP9 |
USER CONFIGURABLE SETTINGS | |||
Function | Jumper | Position | |
Monitor type select color | JP3 | Closed | |
Monitor type select monochrome | JP3 | Open | |
CMOS memory normal operation | JP4 | Closed | |
CMOS memory clear | JP4 | Open | |
BIOS type select 27256 | JP5 | pins 2 & 3 closed | |
BIOS type select 27128 | JP5 | pins 1 & 2 closed | |
NPU speed select 4.77MHz | JP6 | pins 1 & 2 closed | |
NPU speed select 10.6MHz | JP6 | pins 2 & 3 closed |
DRAM CONFIGURATION | ||||||
Size | Bank 0 | P 0 | Bank 1 | P 1 | Bank 0A | Bank 1A |
512KB | (4) 44256 | (2) 41256 | NONE | NONE | NONE | NONE |
640KB | (4) 44256 | (2) 41256 | (4) 4464 | (2) 4164 | NONE | NONE |
1MB | (4) 44256 | (2) 41256 | (4) 44256 | (2) 41256 | NONE | NONE |
2MB | NONE | NONE | NONE | NONE | (2) 1M x 9 | NONE |
4MB | (4) 441000 | (2) 411000 | (4) 441000 | (2) 411000 | NONE | NONE |
4MB | NONE | NONE | NONE | NONE | (2) 1M x 9 | (2) 1M x 9 |
CPU SPEED CONFIGURATION | |||
System clock | Bus clock | DRAM speed | JP7 |
12MHz | 8MHz asynch | 100ns | Open |
12MHz | 6MHz synch | 100ns | Closed |
16MHz | 8MHz synch | 80ns | Closed |
20MHz | 8MHz asynch | 60/70ns | Open |
20MHz | 10MHz synch | 60/70ns | Closed |
MISCELLANEOUS TECHNICAL NOTE |
Note: The location of pin 1 is unidentified. |