I'm really enjoying reading this. I went spelunking for the EXE header to find any references to Mark Zbikowski (who is still immortalized in PE-format EXE file

I'm really enjoying reading this. I went spelunking for the EXE header to find any references to Mark Zbikowski (who is still immortalized in PE-format EXE files today). v20source/exec.asm, line 95: exec_signature DW ? ; must contain 4D5A (yay zibo!) There are a couple of other references, too.