Handbook 486


486SX @ 25Mhz


8MB (4MB on-board + 4 MB extra)




  • Gateway 2000 External FDD Drive
  • D-Link DE-650 PCMCIA Network Card with Ethernet Adapter

Operating Systems

  • MS-DOS 6.22
  • Windows for Workgroups 3.11
  • Windows 95 OSR1 (due to the twisted configuration of the D-Link DE-650 on WfW 3.11, I cleared the system and installed Win95. I used OSR1 because of its smaller size, of about 40MB)

Installed Software

  • WordPerfect 6.0
  • Microsoft Excel 4
  • SPSS
  • Internet Explorer 5 (Windows 95)
  • mIRC (Win 95)

Technical Specifications

System Gateway® HandBook 486SX-25/SX-33
Battery 2200 mAh or 2500 mAh Ni-MH
BIOS 128K, includes security password and power management
Cache 8K
Case dimensions 9.7 × 5.9 × 1.6 inches (W × D × H)
Certification FCC Class B, UL, CSA, TUV, IEC
CPU Intel SL Enhanced 80486
CPU speed 25 MHz, 33 MHz
External video graphics adapter (VGA) port Available using VGA PC Card
Floppy disk drive 3.5-inch, external
Graphics mode VGA gray scale
Hard disk
  • 80 or 130 MB (SX-25)
  • 130 or 250 MB (SX-33)
Input/Output ports Floppy/parallel port, serial port, PS/2 external keyboard connector
Keyboard 78 Keys, 94% scale emulates standard AT keyboard
Mouse EZ-Point (stick pointing device)
Operating Environment 10-40° C; 20-85% non-condensing humidity
PC Card sockets One Type II socket
PC Card controller CL-PD6710
Power supply 2200 mAh Ni-MH battery or plug-in AC adapter
RAM Type 80 ns 3.3v Low power Dynamic Random Access Memory (DRAM)
RAM capacity 4, 8, 20
Screen Backlit black negative FSTN LCD, 640×480, 7.8-inch diagonal
Video controller Chips and Technologies 65510 controller
Video memory 256 K
Video specifications MS-DOS

  • Resolution: 640×400
  • Colors:N/A
  • Hz: 70

Windows 3.x

  • Resolution: 640×400
  • Colors: 16 and 256
  • Hz: 60 Non-Interlaced

Windows 3.x

  • Resolution: 800×600
  • Colors: 16 and 256
  • Hz: 56 Non-Interlaced

Windows 3.x

  • Resolution: 1024×768
  • Colors: 16
  • Hz: 44 Interlaced
Video memory 256K
Weight 2.9 pounds with battery

Specifications IRQs
Part number HB4DX2-40,HB4DX2-50,HB4SX-25,HB4SX-33,HB4SX25-130,SYSHBK002AAWW

Interrupt requests (IRQ) are used by hardware devices to signal to the motherboard that a request must be fulfilled.

IRQ 0 is used by the system timer.

IRQ 1 is used by the keyboard controller.

IRQ 2 is used by the second IRQ controller.

IRQ 3 is available with BIOS 1.24 or later. IRQ 3 is commonly used by modem PC Cards.

IRQ 4 is used by the serial port.

IRQ 5 is available.

IRQ 6 is used by the floppy disk drive controller.

IRQ 7 is used by the parallel port.

IRQ 8 is used by the real time clock.

IRQ 9 is available.

IRQ 10 is available unless CardSoft is installed. If CardSoft is installed, the IRQ is used as the card status change interrupt for CardSoft.

IRQ 11 is available. It is commonly used by network PC Cards.

IRQ 12 is used by the EZ-point mouse or a external PS/2 mouse.

IRQ 13 is used by math coprocessor.

IRQ 14 is used by the hard disk controller.

IRQ 15 is available.


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