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. |