NOTES ON PROUT SCREEN DRIVER
                     ============================
                      J.G.Harston -- 17 Feb 1986

Assemble with:
PRINTC0.s code at C000, workspace at 5B00, Chars in ROM, UDCs in ROM
PRINTF0.s code at F000, workspace at FC00, Chars in ROM, UDCs at FC00

Load and run code with:
CLEAR 61439:LOAD "PRINTOUT"CODE:RANDOMISE USR 61440
(or CLEAR &EFFF:*PRINTOUT)

Attaches to channel "P". Gives the following printout effects:

 0 Null                     16,n   PAPER
 1 Null                     17,n   INK
 2 Disable output           18,n   FLASH
 3 Enable output            19,n   BRIGHT
 4 Home cursor to (0,0)     20,n   INVERSE
 5 Reset all windows        21,n   OVER (0,1,2 = set,xor,or)
 6 Print comma              22,y,x AT
 7 Beep                     23,l,h TAB
 8 Cursor left              24,n   BORDER
 9 Cursor right             25,x,y PLOT
10 Cursor down              26,n   MODE
11 Cursor up                27,n   Escape
12 Clear window             28,n   ignored
13 Newline                  29,n   WINDOW (n=0 to 7)
14 Shift Out                30,l,b,r,t            DEFWINDOW
15 Shift In                 31,n,a,b,c,d,e,f,g,h  DEFCHR$

Screen modes:
 mode  x  y  character size
  1   64 24  half-width
  2   32 12  double-height
  3   32 24  normal
  4   16 12  double-width, double-height
  5   16 24  double-width

CHR$32-CHR$127 are standard characters pointed to by CHARS
CHR$128-CHR$143 are the standard Spectrum block graphics
CHR$144-CHR$159 are block graphics with a grey background
CHR$160-CHR$255 are user defined characters pointed to by UDC