User's Manual

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80286

SYSTEM INITIALIZATION

Copy

the

legment

at

DS

to

the

legment

at

ES

for

length

CX.

Fill

the

end

with

AX-CX

zerol.

Ule

word

operatlonl

for

Ipeed

but

allow

odd

byte

operatlonl.

cop

y_w

I t

h_

f I

II

xor

xor

lub

add

rcr

rep

mOV!5W

xchg

l n c

movlb

or

Jz

Itolb

dec

even_copy:

Ihr

rep

Itolw

lnc

I t a I b

exit_copy:

ret

copy_wi

th_f

III

Inlt_code

fB

proc

I I • I I

d

I.

d I

eltCI

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1

c x • 1

aX,cl

even_copy

Cit

ex

exit_copy

c x

c x

• 1

exit_copy

endp

endl

end

A-9

Start

at

beginning

of

legmentl

Form

fill

count

Convert

limit

to

count

Allow

full

64K

move

Copy

DT

Into

allal

area

Get

fill

count

and

zero

AX

Jump

If

even

byte

count

on

copy

Copy

odd

byte

Exit

If

no

fill

Even

out

the

legment

offlet

Adlult

remaining

fill

count

Form

word

count

on

fill

Clear

unuled

wordl

at

end

Exit

If

no

odd

byte

remalnl

Clear

lalt

odd

byte