Datatech Enterprises Apex 386SX/20 User Manual

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Datatech Enterprises Apex 386SX/20 User Manual Manual pdf 107 page image

6-2 Entering 20MHz Turbo ModeThe main advantage of your mainboard over ordinary PC/AT main-boards is its dual clock system. This innovation makes it possible foryour computer to operate at either of two clock speeds: 10MHz or20MHz.Entering 20MHz Turbo ModeYour system supports both a software and hardware switch to togglebetween 10MHz and 20MHz (Turbo) modes. The two switches are setup using jumper J3 and are mutually exclusive. You must choose eithersoftware or hardware if you are setting up the board yourself.Software Turbo SwitchWhen jumper J3 is covered with a jumper cap or is connected to aclosed hardware Turbo switch, the speed can be toggled betweenTurbo and Normal from the keyboard. The clock speed when you turnthe system on will be 10MHz (or 20MHz). To switch the speed to20MHz (or l0MHz), do the following: press and hold down the control and alternate keys on the keyboard while you press theminus <-> key. The Turbo LED on your panel, if you have one, will light.For more information on the Turbo LED, refer to the Connectorssection.Hardware Turbo SwitchIf your hardware Turbo switch is connected to pins one and two ofjumper J3, pushing the switch on and off will toggle between 10MHzNormal mode and 20MHz Turbo mode.Alternate Use of Both SwitchesBoth the hardware and the software switches may be used alternative-ly, but this is not advised because you may become confused aboutthe mode of operation. When using both switches alternatively, theTurbo LED will be the only accurate indicator of the actual mode: theLED will be on in Turbo mode and off in Normal mode.Chapter 6: Appendix 9

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