comment   |
Common         included  routines for BootRest and BootCheck not needed by BootSave.
|                                       ; end of comment
ReadBootFromFile proc    near
;       Open a file read the Boot.sav into a buffer
               lea       dx,FileName    ; DS:DX point to file
               xor       al,al          ; AL=0 is attribute read/only
               mov       ah,03Dh        ; DOS open function
               int       21h
               jc        FileTrouble
               mov       bx,ax          ; save handle
               mov       cx,512+4       ; read CX DX + 1 sector
               lea       dx,CXSave      ; buffer address
               mov       ah,3fH         ; DOS read
               int       21h
               jc        FileTrouble
               cmp       ax,512+4
               jne       FileTrouble
               mov       ah,3eh         ; DOS close
               int       21h
               jc        FileTrouble
               ret
ReadBootFromFile endp
;===============================================================
CheckGeom      proc      near
;       Check disk geometry (heads, cyls)
;       Ensure we are restoring to a suitable disk
               mov       dx,0080h       ; drive no. for c:
               mov       ax,0800h       ; ah 08 = get disk parameters
               int       13h            ; into CX/DX
               jc        BootTrouble
               cmp       CX,CXSave
               jne       GeomTrouble
               cmp       DX,DXSave
               jne       GeomTrouble
               ret
CheckGeom      endp
;===============================================================