说明：  6502编程大奥秘，一个详细的介绍6502CPU编程的chm格式电子书，里面还提到了许多文曲星上汇编系统的开发
(6502 Programming big mystery, a detailed description 6502CPU programming chm format e-books, which also mentioned a number of Wen Quxing on the compilation of system development)