This is assembler group a group of friends put forward the problem, in fact, is not a big problem, is not rigorous enough to appear a small mistake, but caused my tracking problem all over the sky suspicion. First of all, it’s a code problem where the 21 interrupt is not written in hexadecimal.
The result is that the initial letter is missing a W
At first my mind is to go to the assembly code to investigate, I thought that the assembly code may be wrong, and then I continue to debug, from color to character index, took a lot of detachment, also blame my skill is not fine, did not debug the last code.
