Intermec 6100 Reference Guide

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These services consist of the following topics:

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Keyboard intercept

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Device access

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Program termination

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Event wait interval

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System request key

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Moving memory and reading memory size

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Switching to protected mode

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Indicating interrupt complete

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Returning system configuration parameters

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Returning extended BIOS data area segment

Access to the keyboard BIOS services is through INT 16h.  The AH register is

loaded with the function number to be performed.  Other registers are loaded as

required by the individual functions.  Values are returned in individual registers

as defined by the functions.

Application programs can issue Interrupt 19h to force the computer to reboot.

The computer is forced through the initial powerĆup sequence.

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This computer uses ROM DOS and does not reload disk DOS when an interrupt

19h occurs.  Refer to the Interrupt CrossĆReference table, page 6Ć28, for INT 15h,

System Reset, function AX = 5380h, subfunction BH = 1Dh.

This interrupt handler controls the periodic and alarm interrupt functions from

the RTC.  The periodic function, when activated, occurs 1024 times per second.

The Dword counter is decremented by 976 at each interrupt.  When the location

becomes equal to or less than zero, bit seven of the designated location is set.

The alarm function of the RTC provides an interrupt at the specified time and

software Interrupt 4Ah is issued.

The interrupts supported for the 6100 Computer are listed in the Interrupt

CrossĆReference tale, located under the Interrupt CrossĆRef (by number) tab.

Even though they are matrixed into the entire set of interrupts, each individual

interrupt supported by the 6100 BIOS can be identified by the notation, BIOS,

immediately under the interrupt heading.  The categories of interrupt services

are listed in the center column of Table 6Ć2.
Individual interrupt definitions can be located:

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Looking up almost any noun or verb relating to a specific interrupt in the

Interrupt Index, with the exception of Read, Set, and Get.

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Using the Interrupt CrossĆReference table; or

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Thumbing through the definitions, searching for the notation, BIOS.