![]() ![]() See any book on the fundamentals of Posix-type OSes. Likewise, all writing eventually calls the write() function 'man 2 write'.īoth read() and write() use file-descriptors, which are small positive integers representing an open byte-stream. (NOTE: Again, I haven't written 8086 assembly in years, so I may have confused it with another assembly, so don't expect it to compile.)Ĭlick to expand.All reading from streams or files eventually calls the read() function, described in the man page 'man 2 read'. ![]() ![]() This would write the ASCII character to the screen with the given color - how you pass the variables is up to you also. INC DX move to the next position on the screen. MOV DX, 8000h Start at the upper left location on the screen In the old dos days the screen was mapped to 0xB8000 (If I remember correctly) thus to write ASCII to the screen it would be like this : Embedded systems do a good job with assembly and that is where it is mostly used. There is a good reason why most people don't write things in assembly language any more (for PC's). In todays market system design you really still need to make IO calls to the driver (if you can get one) or program your own API. The BIOS of the computer used to support some of the functions such as writing out characters to the screen, but then the screen was simple and easy to use (ascii value)(color). Here is the thing, Assembly language is just one step away from machine language thus if you want the application to do something you have to write it yourself. ![]()
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