TANDY/RADIO SHACK
2500 SX/20
|
Processor |
80386SX |
|
Processor Speed |
20MHz |
|
Chip Set |
Unidentified |
|
Video Chip Set |
Unidentified |
|
Maximum Onboard Memory |
5MB |
|
Maximum Video Memory |
Unidentified |
|
Cache |
None |
|
BIOS |
Unidentified |
|
Dimensions |
254mm x 218mm |
|
I/O Options |
Floppy drive interface, IDE interface, serial port, parallel port, PS/2 mouse port, riser slot |
|
NPU Options |
80387SX |
|
CONNECTIONS | |||
|
Purpose |
Location |
Purpose |
Location |
|
Floppy drive interface |
CN1 |
IDE interface LED |
J1 |
|
IDE interface |
CN2 |
Riser slot |
SL1 |
|
The location of the serial port, parallel port and PS/2 mouse port is unidentified. | |||
|
USER CONFIGURABLE SETTINGS | |||
|
Function |
Label |
Position | |
|
|
Audio input source select microphone |
JP1 |
Pins 1 & 2 closed |
|
Audio input source select line level |
JP1 |
Pins 2 & 3 closed | |
|
|
Audio output source select headphone |
JP2 |
Pins 1 & 2 closed |
|
Audio output source select line level |
JP2 |
Pins 2 & 3 closed | |
|
|
Monitor type select VGA analog or standard multiple frequency |
JP3 |
Pins 1 & 2 closed |
|
Monitor type select non standard multiple frequency |
JP3 |
Pins 2 & 3 closed | |
|
|
VGA BIOS select PS/2 mode |
JP4 |
Pins 2 & 3 closed |
|
VGA BIOS select AT mode |
JP4 |
Pins 1 & 2 closed | |
|
|
Video IRQ9 disabled |
JP5 |
Open |
|
Video IRQ9 enabled |
JP5 |
Pins 1 & 2 closed | |
|
|
On board video enabled |
JP6 |
Pins 1 & 2 closed |
|
On board video disabled |
JP6 |
Pins 2 & 3 closed | |
|
DRAM CONFIGURATION | |||
|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
|
1.5MB |
1MB |
(2) 256K x 9 |
None |
|
2MB |
1MB |
(2) 256K x 9 |
(2) 256K x 9 |
|
3MB |
1MB |
(2) 1M x 9 |
None |
|
5MB |
1MB |
(2) 1M x 9 |
(2) 1M x 9 |
|
Note: Bank 0 is factory installed and is not configurable. The location is unidentified. | |||