# load --- load a character onto the screen at given coordinates subroutine load (char, row, col) character char integer row, col include SE_COMMON character ch ch = char if (ch < ' 'c || ch >= DEL) ch = Unprintable if (row >= 1 && row <= Nrows && col >= 1 && col <= Ncols && Screen_image (col, row) ~= ch) { call position_cursor (row, col) Screen_image (col, row) = ch call send (ch) } return end