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PS/2 MODEL 70 486/25
IBM CORPORATION
PS/2 MODEL 70 486/25
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Processor
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80486DX
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Processor Speed
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25MHz
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Chip Set
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IBM
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Max. Onboard DRAM
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8MB
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Cache
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None
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BIOS
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IBM
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Dimensions
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355.6mm x 304.8mm
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I/O Options
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Serial port, parallel port, pointing device connector, proprietary hard/floppy drive controller slot, proprietary 16-bit MCA video adapter slot, VGA port
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NPU Options
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None
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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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Battery/speaker
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J1
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Keyboard
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J5
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Serial port
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J2
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Proprietary hard/floppy drive controller
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J6
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Parallel port
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J3
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Proprietary 16-bit MCA video adaptor
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J7
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Pointing device
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J4
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VGA port
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J8
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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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(1) 256K x 36
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NONE
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NONE
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NONE
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2MB
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(1) 256K x 36
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(1) 256K x 36
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NONE
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NONE
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2MB
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(1) 512K x 36
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NONE
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NONE
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NONE
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3MB
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(1) 256K x 36
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(1) 256K x 36
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(1) 256K x 36
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NONE
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4MB
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(1) 256K x 36
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(1) 256K x 36
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(1) 256K x 36
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(1) 256K x 36
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4MB
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(1) 512K x 36
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(1) 512K x 36
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NONE
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NONE
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5MB
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(1) 256K x 36
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(1) 512K x 36
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(1) 512K x 36
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NONE
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6MB
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(1) 256K x 36
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(1) 256K x 36
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(1) 512K x 36
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(1) 512K x 36
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6MB
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(1) 512K x 36
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(1) 512K x 36
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(1) 512K x 36
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NONE
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7MB
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(1) 256K x 36
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(1) 512K x 36
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(1) 512K x 36
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(1) 512K x 36
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8MB
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(1) 512K x 36
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(1) 512K x 36
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(1) 512K x 36
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(1) 512K x 36
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Notes:SIMMs are a proprietary IBM design, standard 36-bit SIMMs can not be used.
Onboard memory does not need to be totally populated in order to use memory expansion cards.
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