Specifications

D:\D\inter61a\INTERRUP.A Saturday, January 08, 2011 11:31 AM

generate codes 55h and 56h for F11 and F12, which cannot be managed

by standard DOS keyboard drivers

[Note2] the Schneider/Amstrad PC1512 PC keyboards contain extra keys,

a mouse, and a digital joystick, which are handled like extra keys.

The joystick's motion scancodes are converted into standard arrow

keys by the BIOS, and the joystick and mouse button scan codes are

converted to FFFFh codes in the BIOS keyboard buffer

(see CMOS 15h"AMSTRAD").

In addition to the keys listed in the table above, there are

Del-> (delete forward) 70h

Enter 74h

SeeAlso: #00602 at INT 16/AX=6F07h,#03214 at INT 4A/AH=05h

--------C-09---------------------------------

INT 09 C - CPU-generated (80286,80386) - PROCESSOR EXTENSION PROTECTION ERROR

Desc: called if the coprocessor attempts to access memory outside a segment

boundary; it may occur at an arbitrary time after the coprocessor

instruction was issued

Notes: until the condition is cleared or the coprocessor is reset, the only

coprocessor instruction which may be used is FNINIT; WAIT or other

coprocessor instructions will cause a deadlock because the

coprocessor is still busy waiting for data

for the 486+, a coprocessor protection error generates an INT 0D

SeeAlso: INT 07"CPU"

--------*-09---------------------------------

INT 09 P - internal hardware - RESERVED BY Intel (80486)

Note: this exception has been moved to INT 0D

SeeAlso: INT 09"CPU",INT 0D

--------H-0A---------------------------------

INT 0A C - IRQ2 - LPT2 (PC), VERTICAL RETRACE INTERRUPT (EGA,VGA)

Notes: the TOPS and PCnet adapters use this interrupt request line by default

DOS 3.2 revectors IRQ2 to a stack-switching routine; DOS 3.3+ does so

unless STACKS=0 has been set in CONFIG.SYS. MS/PC-DOS 3.3+ use the

IBM Interrupt Sharing Protocol (see #02568) when hooking this IRQ

on ATs and above, the physical data line for IRQ2 is labeled IRQ9 and

connects to the slave 8259. The BIOS redirects the interrupt for

IRQ9 back here.

under DESQview, only the INT 15h vector and BASIC segment address (the

word at 0000h:0510h) may be assumed to be valid for the handler's

process

many VGA boards do not implement the vertical retrace interrupt,

including the IBM VGA Adapter where the traces are either cut or

-19-

http://www.foxitsoftware.com For evaluation only.