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 How to Save Color Registers After BSAVE of (PICEM) Graphics, Example 2
 
 EXAMPLE 2: (LOD7TO12.BAS)
 -------------------------
 
 To try this example in VBDOS.EXE:
 
   1. From the File menu, choose New Project.
   2. Copy the code example to the Code window.
   3. Press F5 to run the program.
 
 ' To run this program in the environment, you must invoke the
 ' environment with the /L switch to load the default Quick library:
 ' VBDOS.EXE /L for Visual Basic 1.0 for MS-DOS
 '
 ' This program loads BSAVEd files from disk into video
 ' memory and restores the graphics image's registers
 ' for screen 7,8,9, or 12. It assumes the picture files
 ' were BSAVEd using code from SAV7TO12.BAS. The values of
 ' the variables MODE%, and YOURFILE must be written into
 ' the code. The graphics image files should be in the default
 ' directory.
 
 DECLARE SUB ConvrtPic ()
 TYPE colortype
         red AS STRING * 1
         green AS STRING * 1
         blue AS STRING * 1
 END TYPE
 
 ' Use the following include file for Visual Basic 1.0 for MS-DOS:
 REM $INCLUDE: 'VBDOS.BI'
 CALL ConvrtPic()
 END
 
 SUB Convrt Pic()
 
 DIM inregx AS RegTypeX
 DIM outregx AS RegTypeX
 DIM colorbuf(15) AS colortype
 
 SCREEN MODE%
 ' Where MODE% = 7  for screen 7,
 '             = 8  for screen 8,
 '             = 9  for screen 9,
 '             = 12 for screen 12.
 CLS
 
 ' If necessary, save the current color registers of the
 ' existing screen using code from SAV7TO12.BAS before
 ' changing colors to the graphics image's palette.
 
 ' BLOAD the graphics image's palette into array.
 DEF SEG = VARSEG(colorbuf(0))
 BLOAD "YOURFILE.REG", VARPTR(colorbuf(0))
 ' Where YOURFILE.REG is the BSAVEd file created in
 ' SAV7TO12.BAS which contains the color registers.
 
 DEF SEG
 ' Call interrupt to restore graphics image's palette to registers.
 inregx.ax = &H1012
 inregx.bx = 0
 inregx.cx = 16
 inregx.es = VARSEG(colorbuf(0))
 inregx.dx = VARPTR(colorbuf(0))
 CALL INTERRUPTX(&H10, inregx, outregx)
 
 ' BLOAD 4 bit planes created in SAV7TO12.BAS.
 DEF SEG = &HA000
 
 FOR k = 0 TO 3
         OUT &H3C4, 2
          ' Makes the port at &H3C4 enable the data register at &H3C5.
         OUT &H3C5, 2 ^ k
          ' Selects next bit plane.
         f$ = "YOURFILE.B_" + CHR$(k + 48)
         ' Where YOURFILE.B_ is the filename of the converted graphics
         ' image.
         BLOAD f$, 0
 NEXT k
 
 DEF SEG
 END SUB