INFORMTECH INTERNATIONAL, INC.
IT486SL-50MHz Ver. 2.0
|
Processor |
80486SX/80487SX/80486DX |
|
Processor Speed |
20/25/33/50MHz |
|
Chip Set |
OPTI |
|
Max. Onboard DRAM |
40MB |
|
SRAM Cache |
64/256KB |
|
BIOS |
OPTI |
|
Dimensions |
218mm x 330mm |
|
I/O Options |
Auxiliary keyboard connector |
|
NPU Options |
4167 |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
External battery |
J11 |
Turbo LED |
JP11 |
|
Power LED & keylock |
J20 |
Reset switch |
SW1 |
|
Speaker |
J21 |
Turbo switch |
SW2 |
|
Auxiliary keyboard |
J22 | ||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Jumper |
Position | |
|
Monitor type select monochrome |
JP2 |
open | |
|
Monitor type select color |
JP2 |
closed | |
|
Factory configured - do not alter |
JP6 |
open | |
|
External battery type select lithium 3.6VDC |
JP14 |
pins 1 & 3 closed | |
|
External battery type select alkaline 4.5VDC |
JP14 |
pins 1 & 2 closed | |
|
External battery type select four pack AA 6VDC |
JP14 |
pins 3 & 4 closed | |
|
Factory configured - do not alter |
JP15 |
open | |
|
I/O bus select zero wait states |
JP16 JP17 |
closed closed | |
|
I/O bus select one wait state |
JP16 JP17 |
closed open | |
|
I/O bus select two wait states |
JP16 JP17 |
open closed | |
|
I/O bus select three wait states |
JP16 JP17 |
open open | |
|
Factory configured - do not alter |
JP18 |
open | |
|
DRAM CONFIGURATION | ||||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
Bank 3 |
|
1MB |
(4) 256K x 9 |
NONE |
NONE |
NONE |
|
2MB |
(4) 256K x 9 |
(4) 256K x 9 |
NONE |
NONE |
|
4MB |
(4) 1M x 9 |
NONE |
NONE |
NONE |
|
5MB |
(4) 256K x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
8MB |
(4) 1M x 9 |
(4) 1M x 9 |
NONE |
NONE |
|
12MB |
(4) 1M x 9 |
(4) 1M x 9 |
(1) 4M x 36 |
NONE |
|
16MB |
(4) 4M x 9 |
NONE |
NONE |
NONE |
|
16MB |
(4) 1M x 9 |
(4) 1M x 9 |
(1) 4M x 36 |
(1) 4M x 36 |
|
20MB |
(4) 1M x 9 |
(4) 4M x 9 |
NONE |
NONE |
|
24MB |
(4) 1M x 9 |
(4) 4M x 9 |
(1) 4M x 36 |
NONE |
|
28MB |
(4) 1M x 9 |
(4) 4M x 9 |
(1) 4M x 36 |
(1) 4M x 36 |
|
32MB |
(4) 4M x 9 |
(4) 4M x 9 |
NONE |
NONE |
|
36MB |
(4) 4M x 9 |
(4) 4M x 9 |
(1) 4M x 36 |
NONE |
|
40MB |
(4) 4M x 9 |
(4) 4M x 9 |
(1) 4M x 36 |
(1) 4M x 36 |
|
CPU TYPE CONFIGURATION | |||
|
CPU Type |
JP3 |
JP4 |
JP5 |
|
80486DX |
pins 2 & 3 closed |
closed |
pins 1 & 2 closed |
|
80487SX |
pins 1 & 2 closed |
closed |
pins 1 & 2 closed |
|
80486SX |
open |
open |
pins 2 & 3 closed |
|
SRAM JUMPER CONFIGURATION | |||
|
Size |
JP9 |
JP10 |
JP12 |
|
64KB |
open |
open |
open |
|
256KB |
closed |
closed |
closed |
|
SRAM CONFIGURATION | |||
|
Size |
Bank 0 |
TAG |
Dirty Bit (U64) |
|
64KB |
(8) 8K x 8 |
(2) 16K x 4 |
(1) 64K x 1 |
|
256KB |
(8) 32K x 8 |
(2) 16K x 4 |
(1) 64K x 1 |
|
CPU SPEED CONFIGURATION | ||
|
CPU Speed |
JP7 |
JP13 |
|
50MHz |
pins 1 & 2 closed |
pins 2 & 3 closed |
|
33MHz |
pins 2 & 3 closed |
pins 1 & 2 closed |
|
25MHz |
pins 2 & 3 closed |
pins 2 & 3 closed |