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4025 LX (250-5125), 4033 LX
TANDY/RADIO SHACK
4025 LX (250-5125), 4033 LX
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Processor
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80386
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Processor Speed
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25MHz
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Chip Set
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Unidentified
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Video Chip Set
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None
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Maximum Onboard Memory
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16MB (on external memory cards)
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Maximum Video Memory
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None
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Cache
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32KB
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BIOS
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Unidentified
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Dimensions
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355mm x 304mm
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I/O Options
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External memory cards (2) CPU slot, floppy drive interface, IDE interface, parallel port, PS/2 mouse port, serial port
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NPU Options
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80387/3167
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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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PS/2 mouse port
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CN1
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External battery
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CN6
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Serial port
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CN2
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Speaker
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CN7
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Parallel port
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CN3
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External memory cards
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SL1 & SL2
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IDE interface
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CN4
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CPU slot
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SL3
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Floppy drive interface
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CN5
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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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Monitor type select through software
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J1
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Pins 2 & 3 closed
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Monitor type select color
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J1
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Pins 1 & 2 closed
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Monitor type select monochrome
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J1
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Open
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»
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IDE IOCHRDY enabled
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J4
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Closed
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IDE IOCHRDY disabled
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J4
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Open
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»
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IDE DIAG normal operation
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J5
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Open
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IDE DIAG diagnostic mode
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J5
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Closed
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»
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I/O recovery mode enabled
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J6
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Closed
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I/O recovery mode disabled
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J6
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Open
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»
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Factory configured - do not alter
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J7
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Closed
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»
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Factory configured - do not alter
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J8
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Closed
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»
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Factory configured - do not alter
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J9
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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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Bank 3
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1MB
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(4) 256K x 9
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None
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None
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None
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2MB
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(4) 256K x 9
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(4) 256K x 9
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None
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None
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4MB
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(4) 1M x 9
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None
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None
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None
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8MB
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(4) 1M x 9
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(4) 1M x 9
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None
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None
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4MB
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(4) 256K x 9
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(4) 256K x 9
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(4) 256K x 9
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(4) 256K x 9
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10MB
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(4) 1M x 9
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(4) 1M x 9
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(4) 256K x 9
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(4) 256K x 9
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16MB
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(4) 1M x 9
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(4) 1M x 9
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(4) 1M x 9
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(4) 1M x 9
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Note: Banks 0 & 1 are located on the first memory card and banks 2 & 3 are located on the second memory card.
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CACHE CONFIGURATION
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Note: The location of the 32KB cache is unidentified.
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BIOS SELECTION
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Setting
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J2
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J3
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27128
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Open
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Open
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| »
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27256
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Closed
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Closed
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27512
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Open
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Closed
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MISCELLANEOUS TECHNICAL NOTE
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Jumpers are labeled for information and location purposes only. The purpose of SL4 is unidentified.
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