Page 35 There is an error in the listing at the top of the page. It reads: var: g_array:array[0..20] of 0..255; begin g_array[0]:=19; g_array[1]:=2; unitwrite(1,g_array,2,,12); end; It should read: var: g_array:packed array[0..20] of 0..255; begin g_array[0]:=19; g_array[1]:=2; unitwrite(1,g_array,2,,12); end; Page 135 All of the reference numbers on the keys need to have one added to them to match the table on page 136.