INFORMTECH INTERNATIONAL, INC.
IT486EX VER. 1
|
Processor |
80486SX/80486DX |
|
Processor Speed |
25/33MHz |
|
Chip Set |
Intel |
|
Max. Onboard DRAM |
64MB |
|
Cache |
64/128KB (with external cache card) |
|
BIOS |
Phoenix |
|
Dimensions |
330mm x 218mm |
|
I/O Options |
None |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Turbo switch |
P1 |
Reset switch |
P4 |
|
Turbo LED |
P2 |
Power LED & keylock |
P5 |
|
Speaker |
P3 |
External battery |
P20 |
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper/Switch |
Position | |
|
|
Cache write protect disabled |
J5 |
Closed |
|
Cache write protect enabled |
J5 |
Open | |
|
|
On board DRAM access enabled |
J8 |
Closed |
|
On board DRAM access disabled |
J8 |
Open | |
|
|
I/O recovery time select 8-bit = 11BLCK, 16-bit = 3BLCK |
J16 |
Closed |
|
No recovery time |
J16 |
Open | |
|
|
80486 internal cache enabled |
J17 |
Closed |
|
80486 internal cache disabled |
J17 |
Open | |
|
|
Turbocache486 enabled |
J20 |
Closed |
|
Turbocache486 disabled |
J20 |
Open | |
|
|
BIOS duplicated (to 00FF0000 hex) |
J36 |
Closed |
|
BIOS not duplicated |
J36 |
Open | |
|
|
Turbo mode enabled |
P1 |
Open |
|
Turbo mode disabled |
P1 |
Closed | |
|
|
Factory configured - do not alter |
SW1/7 |
Off |
|
|
Monitor type select monochrome |
SW1/8 |
Off |
|
Monitor type select color |
SW1/8 |
On | |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
NONE |
|
4MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
10MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
10MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
|
16MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
NONE |
NONE |
|
34MB |
(4) 4M x 9 |
(4) 4M x 9 |
(4) 256K x 9 |
(4) 256K x 9 |
|
34MB |
(4) 256K x 9 |
(4) 256K x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
|
40MB |
(4) 4M x 9 |
(4) 4M x 9 |
(4) 1M x 9 |
(4) 1M x 9 |
|
40MB |
(4) 1M x 9 |
(4) 1M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
|
64MB |
(4) 4M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
(4) 4M x 9 |
|
MEMORY BANK CONFIGURATION (BANK 0 & 1) | ||
|
SIMM Type |
SW1/1 |
SW1/2 |
|
No memory installed |
Off |
Off |
|
256KB |
On |
Off |
|
1MB |
Off |
On |
|
4MB |
On |
On |
|
MEMORY BANK CONFIGURATION (BANK 2 & 3) | ||
|
SIMM Type |
SW1/3 |
SW1/4 |
|
No memory installed |
Off |
Off |
|
256KB |
On |
Off |
|
1MB |
Off |
On |
|
4MB |
On |
On |
|
MEMORY SPEED/CPU MHZ CONFIGURATION (25MHZ) | ||
|
SIMM Type |
SW1/5 |
SW1/6 |
|
256KB |
Off |
Off |
|
1MB |
On |
On |
|
4MB |
On |
On |
|
Note: SW1/5 corresponds to Banks 0 & 1 and SW1/6 corresponds to Banks 2 & 3. | ||
|
MEMORY SPEED/CPU MHZ CONFIGURATION (33MHZ) | ||
|
SIMM Type |
SW1/5 |
SW1/6 |
|
256KB |
Off |
Off |
|
1MB |
On |
On |
|
4MB |
Off |
Off |
|
Note: SW1/5 corresponds to Banks 0 & 1 and SW1/6 corresponds to Banks 2 & 3. | ||
|
TURBOCACHE486 CONFIGURATION | |||
|
Module |
J17 |
J18 |
J19 |
|
82485ES |
Open |
Open |
Open |
|
82485MA/MB |
Closed |
Closed |
Closed |
|
TURBOCACHE486 JUMPER CONFIGURATION | ||||
|
Module |
J1 |
J2 |
J29 |
J63 |
|
82485ES |
Open |
Open |
Open |
Open |
|
82485MA/MB |
Closed |
Closed |
Closed |
Closed |
|
CPU SPEED CONFIGURATION | ||
|
Speed |
J3 |
J15 |
|
25MHz |
pins 2 & 3 closed |
Closed |
|
33MHz |
pins 1 & 2 closed |
Open |
|
BATTERY TYPE CONFIGURATION | |
|
Battery type |
J64 |
|
4.5V (without internal current limiting resistor) |
pins 3 & 4 closed |
|
3.6V-4.5V (with internal current limiting resistor) |
pins 1 & 3 closed |
|
6V (without internal current limiting resistor) |
pins 2 & 4 closed |
|
6V (with internal current limiting resistor) |
pins 1 & 2 closed |
|
BIOS CONTROL CONFIGURATION | ||
|
ROM type |
J25 |
J35 |
|
28F512 |
Closed |
Closed |
|
28F010 |
Closed |
Open |
|
27C512 |
Open |
Closed |
|
27C010 |
Open |
Open |