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PORTABLE III
COMPAQ COMPUTER CORPORATION
PORTABLE III
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Processor
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80286 (exact location unidentified)
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Processor Speed
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8/12MHz
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Chip Set
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Unidentified
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Max. Onboard DRAM
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6MB (4MB on external memory card)
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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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330mm x 218mm
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I/O Options
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IDE interface, external memory card slot, floppy drive interface, parallel port, serial port, VGA port, display connector
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NPU Options
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80287 (exact location unidentified)
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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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Parallel port
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CN1
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External Memory card slot
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CN5
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VGA port
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CN2
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IDE interface
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CN6
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Serial port
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CN3
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Floppy drive interface
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CN7
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Display controller
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CN4
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USER CONFIGURABLE SETTINGS
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Function
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Jumper/Switch
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Position
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»
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Hard drive enabled
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CN8/5
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On
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Hard drive disabled
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CN8/5
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Off
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»
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CPU speed select 8MHz
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CN8/6
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On
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CPU speed select 12MHz
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CN8/6
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Off
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»
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Video type select boots plasma display in color mode
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CN8/7
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On
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Video type select boots plasma display in monochrome mode
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CN8/7
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Off
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»
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Factory configured - do not alter
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CN8/8
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Off
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»
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CPU access speed select 8/12
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E1
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pins 1 & 2 closed
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CPU access speed select 8
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E1
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pins 2 & 3 closed
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»
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Factory configured - do not alter
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E2
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N/A
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»
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Printer port enabled
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E7
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pins 2 & 3 closed
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Printer port disabled
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E7
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pins 1 & 2 closed
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»
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Controller address select primary
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E8
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pins 1 & 2, 4 & 5 closed
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Controller address select secondary
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E8
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pins 2 & 3, 4 & 5 closed
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»
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System ROM select 16KB
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E10
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pins 1 & 2 closed
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System ROM select 32KB
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E10
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pins 2 & 3 closed
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»
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ROM Set2 enabled
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E12
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pins 1 & 2 closed
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ROM Set2 disabled
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E12
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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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256KB
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(1) 256K x 9
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NONE
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512KB
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(1) 256K x 9
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(1) 256K x 9
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1MB
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(1) 1M x 9
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NONE
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1.5MB
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(1) 1M x 9
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(1) 256K x 9
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2MB
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(1) 1M x 9
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(1) 1M x 9
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COM/IRQ CONFIGURATION
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COM/IRQ
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E5/E16
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COM1/IRQ4 Serial
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pins 2 & 4 closed
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COM1/IRQ4 Modem
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pins 3 & 4 closed
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COM2/IRQ3 Serial
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pins 1 & 2 closed
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COM2/IRQ3 Modem
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pins 1 & 3 closed
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SERIAL PORT CONFIGURATION
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COM port
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E3/E4
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COM1 Serial
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pins 1 & 2 closed
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COM1 Modem
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pins 1 & 3 closed
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COM2 Serial
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pins 1 & 3 closed
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COM2 Modem
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pins 3 & 4 closed
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DRAM BASE MEMORY SWITCH CONFIGURATION
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Size
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CN8/1
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CN8/2
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None
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On
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On
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256KB
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On
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Off
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512KB
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Off
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On
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640KB
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Off
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Off
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DRAM EXTENDED MEMORY SWITCH CONFIGURATION
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Base memory
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Extended memory
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CN8 Switch 3
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CN8 Switch 4
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640KB
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256KB
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On
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Off
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640KB
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1MB
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Off
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On
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DRAM BANK CONFIGURATION
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Bank
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E17
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None
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pins 2 & 3, 4 & 5 closed
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Bank 1
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pins 2 & 3, 5 & 6 closed
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Bank 1 & 2
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pins 1 & 2, 4 & 5 closed
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Bank 1, 2, & 3
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pins 1 & 2, 5 & 6 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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512KB
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(2) 256K x 9
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NONE
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NONE
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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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NONE
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1.5MB
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(2) 256K x 9
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(2) 256K x 9
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(2) 256K x 9
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2MB
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(2) 1M x 9
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NONE
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NONE
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4MB
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(2) 1M x 9
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(2) 1M x 9
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NONE
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6MB
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(2) 1M x 9
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(2) 1M x 9
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(2) 1M x 9
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DRAM CONFIGURATION
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Size
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S1
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256K x 9
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pins 1 & 2 closed
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1M x 9
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pins 2 & 3 closed
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