$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
'/*------------------------------------------------------------------*/
$CODE SEG "MLIB5"
'/*------------------------------------------------------------------*/
' DSCREEND(SCREEN$)
'     Display Screen format D.
'     Display Screen by moving old screen out from middle, top and bottom.
'     SCREEN$ = Mem (binary) screen to display.
'     Returns old screen.
'     EXAMPLE:  OLD$ = DSCREEND(SCREEN$)
'/*------------------------------------------------------------------*/
FUNCTION DSCREEND(TEMP$) PUBLIC AS STRING
  R$ = GETSCREEN
'/*-13---------------------------------------------------------------*/
  A$=TEMP$
  Row%=CSRLIN
  Col%=POS(0)
  DEF SEG=GETVIDEOSEGMENT
  O$=PEEK$(0,4000)
  R%=14
  I%=0
  L$=LEFT$(O$,2080)
  R$=RIGHT$(O$,1920)
  WHILE R%>0
    INCR I%
    DECR R%
    IF R%=0 THEN EXIT FUNCTION
    P%=((R%-1)*160)+1
    X%=2080-(I%*160)
    IF X%>0 THEN L$=RIGHT$(L$,X%) ELSE L$=""
    Y%=1920-(I%*160)
    IF Y%>0 THEN R$=LEFT$(R$,1920-(I%*160)) ELSE R$=""
    POKE$ 0,L$+MID$(A$,P%,((I%*160)*2)-160)+R$
    CALL MDELAY(30)
  WEND
  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$ = DSCREEND(TD$)
'     Y$ = GETKEY
'/*------------------------------------------------------------------*/