Offset Name DSA mode
&00 r_flags Flags word determining the type of redraw
&04 r_minx Min x of redraw
&08 r_miny Min y of redraw
&0C r_maxx Max x of redraw
&10 r_maxy Max y of redraw
&14 r_screen Screen address
&18 r_bpl Bytes per raster line of the screen
&1C r_bpp Log base 2 of number of bits per pixel
&20 r_charw Width of a character in pixels
&24 r_charh Height of a character in pixels
&28 r_caddr Address of character cache / font handle
&2C r_cbpl Number of bytes per cached character line
&30 r_cbpc Number of bytes per cached character
&34 r_linesp Line spacing in pixels
&38 r_data Address of data to print on the screen
&3C r_scrollx Horizontal scroll offset
&40 r_scrolly Vertical scroll offset
&44 r_palette Address of palette to be used for colour translation
&48 r_for Foreground colour to use at the start of a line
&4C r_bac Background colour to use at the start of a line
&50 r_workarea Pointer to an area of workspace for the SWIs to use
&54 r_magx Log base 2 of number of x os co-ords per pixel
&58 r_magy Log base 2 of number of y os co-ords per pixel
&5C r_xsize Width of screen in pixels
&60 r_ysize Height of screen in pixels
&64 r_mode Current screen mode
The rest of the block is optional (see r_flags bit 6)
&68 r_length Length of the block
&6C r_lmargin Left margin
&70 r_tmargin Top margin
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