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;
page 80,132
;
title CP/DOS DosSelectDisk mapper
;
dosxxx segment byte public 'dos'
assume cs:dosxxx,ds:nothing,es:nothing,ss:nothing
;
;**********************************************************************
;*
;* MODULE: dosselectdisk
;*
;* FILE NAME: dos048.asm
;*
;* CALLING SEQUENCE:
;*
;* push word drive drive number
;* call dosselectdisk
;*
;* MODULES CALLED: PC-DOS Int 21h, ah=0eh, select disk
;*
;*********************************************************************
public dosselectdisk
.sall
.xlist
include macros.inc
.list
str struc
old_bp dw ?
Return dd ?
Drive dw ? ; drive number
str ends
dosselectdisk proc far
Enter Dosselectdisk ; push registers
mov dx,[bp].drive ; load drive number
dec dx ; adjust for cp/dos incompatibility
mov ah,0eh
int 21h ; select the drive
sub ax,ax ; set good return code
mexit ; pop registers
ret size str - 6 ; return
dosselectdisk endp
dosxxx ends
end
|
