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