Download IBM Personal Computer XT Hardware Reference Library Technical Reference PDF

TitleIBM Personal Computer XT Hardware Reference Library Technical Reference
LanguageEnglish
File Size12.6 MB
Total Pages623
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Document Text Contents
Page 311

Vectors with Special Meanings

Interrupt Hex 1 B - Keyboard Break Address
--

This vector points to the code to be exercised when the Ctrl and
Break keys are pressed on the keyboard. The vector is invoked
while responding to the keyboard intermpt, and control should be
returned through an IRET instruction. The power-on routines
initialize this vector to point to an IRET instruction, so that
nothing will occur when the Ctrl and Break keys are pressed
unless the application program sets a different value.

Control may be retained by this routine, with the following
problems. The Break may have occurred during interrupt
processing, so that one or more End of Interrupt commands must
be sent to the 8259 controller. Also, all 110 devices should be
reset in case an operation was underway at that time.

Interrupt Hex 1 C - Timer Tick

This vector points to the code to be executed on every system-
clock tick. This vector is invoked while responding to the timer
intermpt, and control should be returned through an IRET
instruction. The power-on routines initialize this vector to point to
an IRET instruction, so that nothing will occur unless the
application modifies the pointer. It is the responsibility of the
application to save and restore all registers that will be modified.

Interrupt Hex 1 D - Video Parameters
This vector points to a data region containing the parameters
required for the initialization of the 6845 on the video card. Note
that there are four separate tables, and all four must be
reproduced if all modes of operation are to be supported. The
power-on routines initialize this vector to point to the parameters
contained in the ROM video routines.

ROM BIOS 2-5

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