$CPU 8086          ' make compatible with XT systems
$LIB ALL OFF       ' turn off all PowerBASIC libraries
$ERROR ALL OFF     ' turn off all PowerBASIC error checking
$OPTIMIZE SIZE     ' optimize for smaller code
 $COMPILE UNIT      ' compile to a UNIT (.PBU)
'$COMPILE EXE       ' compile to a UNIT (.PBU)

DEFINT A-Z         ' Required for all numeric functions, forces PB to not
                   ' include floating point in UNIT (makes it smaller)
'/*------------------------------------------------------------------*/
DECLARE FUNCTION GETSCREEN() AS STRING
DECLARE SUB PUTSCREEN(BYVAL X AS STRING)
DECLARE SUB MDELAY(COUNT AS WORD)
DECLARE FUNCTION GETVIDEOSEGMENT() AS INTEGER
'/*------------------------------------------------------------------*/
$CODE SEG "MLIB4"
'/*------------------------------------------------------------------*/
' DSCREEN3(SCREEN$)
'     Display Screen Format 3.
'     Display Screen by moving new screen (SCREEN$) in from right.
'     SCREEN$ = Mem (binary) screen to display.
'     Returns old screen.
'     EXAMPLE:  OLD$ = DSCREEN3(SCREEN$)
'/*-3----------------------------------------------------------------*/
FUNCTION DSCREEN3(TEMP$) PUBLIC AS STRING
  R$ = GETSCREEN
  A$=TEMP$
  Row%=CSRLIN
  Col%=POS(0)
  DEF SEG=GETVIDEOSEGMENT
  Z$=PEEK$(0,4000)
  FOR X%=1 TO 80
    INCR I%
    FOR Z%=1 TO 25
      MID$(Z$,(Z%*160)-(X%*2)+1,X%*2)=MID$(A$,((Z%-1)*160)+1,X%*2)
    NEXT
    POKE$ 0,Z$
    CALL MDELAY(10)
  NEXT
  LOCATE Row%,Col%
  FUNCTION = R$
END FUNCTION
'/*------------------------------------------------------------------*/
'   $INCLUDE "C:\CODE\MLIB\MLIB.INC"
'   TD$ = GETMEM("c:\code\mapper\APOGEE.MEM")
'   T2$ = GETMEM("c:\code\mapper\VMESAM.MEM")
'     PUTSCREEN T2$
'     Y$ = GETKEY
'     T$ = DSCREEN3(TD$)
'     Y$ = GETKEY
'/*------------------------------------------------------------------*/