ADVANCED CMOS SETUP Options,
Continued
Fast Gate A20 Option
The settings are Enabled or Disabled. Gate A20 controls the ability to access memory addresses above 1 MB by enabling or
disabling access to the processor address line A20. To remain XT-compatible and be able to access conventional memory (from
0 - 1024K), address line A20 must always be low, so Gate A20 must be disabled. However, some software programs both enter
protected mode and shut down through AMIBIOS, so A20 must be constantly enabled or disabled. The Fast Gate A20 hardware
circuitry is an alternate method of enabling Gate A20, which speeds up programs that constantly change from conventional
memory to memory addresses above 1 MB.
Turbo Switch Option
This option enables or disables use of the turbo switch. The settings are Enabled or Disabled.
Password Check Option
This option allows the end user to enable password check every time the system boots or runs Setup. The settings are Setup or
Always. If Always is chosen, a user password prompt appears every time the system is turned on. If Setup is chosen, the
password prompt does not appear when the system is turned on but appears when the end user runs Setup.
Shadow RAM Option
ROM shadow is a technique in which code is copied from slower ROM to faster RAM. AMIBIOS is then executed from the
RAM. In the Mark V Baby Screamer AMIBIOS, the system and video BIOS are shadowed from ROM to RAM. The settings are
Enabled or Disabled.
Summary of Contents for 42 Series
Page 1: ...American Megatrends Inc Series 42 Mark V Baby Screamer 80386 Motherboard User s Guide ...
Page 2: ...MAN 642 Rev C 9 11 92 ...
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Page 35: ...A29 SA02 B29 5 A30 SA01 B30 OSC A31 SA00 B31 GND ...
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Page 85: ...SRAM Locations ...