$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
'/*------------------------------------------------------------------*/
$CODE SEG "MLIB5"
'/*------------------------------------------------------------------*/
' DSCREENF(SCREEN$)
'     Display Screen format F.
'     Display Screen by moving old screen out from middle.
'     SCREEN$ = Mem (binary) screen to display.
'     Returns old screen.
'     EXAMPLE:  OLD$ = DSCREENF(SCREEN$)
'/*------------------------------------------------------------------*/
FUNCTION DSCREENF(TEMP$) PUBLIC AS STRING
  R$ = GETSCREEN
'/*-15---------------------------------------------------------------*/
  A$=TEMP$
  Row%=CSRLIN
  Col%=POS(0)
  DEF SEG=GETVIDEOSEGMENT
  O$=PEEK$(0,4000)
  Z$=O$
  FOR C%=40 TO 1 STEP -1
    FOR R%=1 TO 25
      MID$(Z$,((R%-1)*160)+1,160)=MID$(O$,((R%-1)*160)+(80-(C%*2))+1,(C%*2))+MID$(A$,((R%-1)*160)+(C%*2)+1,(80-(C%*2))*2)+MID$(O$,((R%-1)*160)+(C%*2)+(80-(C%*2))+1,(C%*2))
    NEXT
    POKE$ 0,Z$
    CALL MDELAY(10)
  NEXT
  POKE$ 0,A$
  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$ = DSCREENF(TD$)
'     Y$ = GETKEY
'/*------------------------------------------------------------------*/