APPENDIX ELEVEN



66             42             CRITIC
     POKE 66,1 to disable the update between shadow and hard-
     ware registers; then you can POKE directly into the hardware
     registers themselves. You can disable VBLANK at 54286 ($D40E)
     as well.

67-73          43-49          FMZSPG
     Reinitialized by FMS each time it takes control.

82,83          52,53          LMARGN and RMARGN
     Both have a range of 0 to 39.

85,86          55,56          COLCRS
     Has a range of 0 to 319.

87             57             DINDEX
     To turn off the cursor when drawing in a text mode, POKE 752,1,
     followed by a PRINT statement, To get different colors, add a
     COLOR statement before the PLOT routine, The character will
     be the ASCII equivalent of the number which follows COLOR.

88,89          58,59          SAVMSC
     The program to save the graphics screen doesn't work, To save
     your graphics screen, create a string to hold a machine lan-
     guage call routine:

     1 DATA 104,104,104,170,76,66,228
     2 REM PLA, PLA, PLA, TAX, JMP $E456
     5 FOR N=1 TO 7:READ BYTE:ML$(N,N)=CHR$(BYTE
       ):NEXT N

     Now OPEN a channel for writing to disk (OPEN #4.8,0,
     "D:filename.ext"). Find RAMTOP (FINISH = PEEK(106) * 256 -
     160), subtracting 160 bytes for any text window screen. Find the
     address of the display list (DLIST = PEEK(560) + 256 *
     PEEK(561): START = PEEK(DLIST + 4) + 256 * PEEK(DLIST + 5):
     HIGH = INT(START/256): LOW = START - 256 * HIGH), and
     POKE it into the proper location in the IOCB (POKE 900,LOW:
     POKE 901,HIGH).

     Next, figure the screen length (SIZE = (FINISH - START) + 1:
     SZHI = INT(SIZE/256): SZLO = SIZE - 256 * B1), and POKE it into
     the IOCB (POKE 904,SZLO: POKE 905,SZHI). POKE the binary SAVE
     command into the IOCB (POKE 898,11). Call the CIO with the
     USR command (X=USR(ADR(ML$),4 * 16)). Finally, save your
     current graphics mode (MODE = PEEK(87): PUT #4,MODE) and
     color registers (FOR N = 708 TO 712; PUT #4,PEEK(N): NEXT N)
     and CLOSE #4.