INT86.EXE


                                                CLASS: Lattice


NAME
    INT86           sets registers and generates interrupt from keyboard


SYNOPSIS
    int86 [<a,b,c,d}{l,h,x}{si,di} [=] <value>,<number>] ...

DESCRIPTION
    Values can be start with 0x for hexidecimal, 0 for octal or
    default to decimal. A number not equated to a register will be used
    as the interrupt number.
    This program permits the user to set the CPU registers and generate
    DOS and BIOS interrupts directly from the keyboard. It is very usuful
    when trying to see what values are returned in what registers. I have
    found it to be an excellent teaching tool for learning about
    interrupts and DOS service functions.


EXAMPLE
    The best way to learn about int86 is to try using it.
    

int86 33 ah=42

    vec=33
reg       h                      l                          x
 a  0052, 42,0x2a          0000,  0,0x00          0025000,10752,0x2a00
 b  0000,  0,0x00          0000,  0,0x00          0000000,    0,0x0000
 c  0000,  0,0x00          0000,  0,0x00          0000000,    0,0x0000
 d  0000,  0,0x00          0000,  0,0x00          0000000,    0,0x0000
 si                                               0000000,    0,0x0000
 di                                               0000000,    0,0x0000
reg       h                      l                          x
 a  0052, 42,0x2a          0003,  3,0x03          0025003,10755,0x2a03
 b  0000,  0,0x00          0000,  0,0x00          0000000,    0,0x0000
 c  0007,  7,0x07          0302,194,0xc2          0003702, 1986,0x07c2
 d  0014, 12,0x0c          0037, 31,0x1f          0006037, 3103,0x0c1f
 si                                               0000000,    0,0x0000
 di                                               0000000,    0,0x0000


 In this example the DOS service interrupt (decimal 33) was requested.
 The DOS function call to function 42 (decimal) was placed in ah.
 This request the date to be returned.
 Upon return for the interrupt cx has the year (1986)
 dh has the month (12) dl has the day (31) and al has a 3 for the day of the
 week (Wednesday).


    This routine may also look for the current setup of your machine,
    show availible memory or set screen attributes. Be very careful when
    setting registers. Un predicible things may happen if you make a
    mistake. Check with any guide to DOS functions and BIOS calls for
    what registers to load.