Biosin tunnistaminen

There may be up to three identification lines in the BIOS startup screen.

 
 
 
 
 
 

First Identification Line

(1) Processor Type

  • ? 8088 or 8086
  • ? 80286
  • ? 80386
  • X 80386SX
  • 4 80486
  • 5 Pentium

(2) Size of BIOS

  • 0 64K
  • 1 128K

(4-5) Major Version Number

(6-7) Minor Version Number

(9-14) Reference Number

(16) Halt on POST Error

  • 0 Off
  • 1 On

(17) Initialize CMOS in every boot

  • 0 Off
  • 1 On

(18) Block pins 22 and 23 of the keyboard controller

  • 0 Off
  • 1 On

(19) Mouse support in BIOS/keyboard controller

  • 0 Off
  • 1 On

(20) Wait for <F1> if error found

  • 0 Off
  • 1 On

(21) Display floppy error during POST

  • 0 Off
  • 1 On

(22) Display video error during POST

  • 0 Off
  • 1 On

(23) Display keyboard error during POST

  • 0 Off
  • 1 On

(25-26) BIOS Date Month

(27-28) BIOS Date Day

(29-30) BIOS Date Year

(32-39) Chipset Identification / BIOS Name

(41) Keyboard controller version number


Second Identification Line

(1-2) Pin number for clock switching through keyboard controller

(3) Indicates high signal on pin switches clock speed to high or low

  • H High
  • L Low

(5) Clock switching through chipset registers

  • 0 Off
  • 1 On

(7-10) Port address to switch clock high

(12-13) Data value to switch clock high

(15-16) Mask value to switch clock high

(18-21) Port address to switch clock low

(23-24) Data value to switch clock low

(26-27) Mask value to switch clock low

(29-31) Pin number for turbo switch


Third Identification Line

(1-2) Keyboard Controller Pin for cache control

(3) Indicates whether high signal on cache control pin enables or disables cache

  • H Enable
  • L Disable

(5) Indicates if the high signal if used on the keyboard controller pin

  • 0 False
  • 1 True

(7-9) Cache control through chipset registers

  • 0 Cache control off
  • 1 Cache control on

(11-12) Port address to enable cache through special port

(14-15) Data value to enable cache through special port

(17-20) Mask value to enable cache through special port

(22-23) Port address to disable cache through special port

(25-26) Data value to disable cache through special port

(28-29) Mask value to disable cache through special port

(31) Pin number for resetting the 82335 memory controller

(33) BIOS modified flag (Incremented each time BIOS is modified)

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