Download NGASM 8086/8088 Assembler 1.3
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NGASM 8086 / 8088 Assembler simplifies learning Assembly Language with a 7000-line long manual that elaborately describes exact usage of Assembler Instructions. You understand any Instruction in a single reading. Lots of small routines and unbelievably tiny ready-to-assemble-and-run programs are provided.
If you are someone who likes to write your own code, you need an Assembler. If you wonder who is creating/opening a file, etc, you need to learn none other than Assembly Language. Because other programming languages conceal code that actually ends up in the executable. And NGASM 8086/8088 Assembler is a very good starting point even for those who threw away an Assembler primer. You will see what your instinct can do for you.
Uses only a small number of operators and directives (mostly used ones).
You can write anything Ralf Brown's Interrupt list makes you feel like writing, that is, for up to WINDOWS 98SE. The code runs in a DOS box; that is ok compared to being able to do nothing in the investigation of a problem on the computer (for years, sometimes). Users on systems with up to WINDOWS 98SE still have a chance to write and run TSR's and do some exploration on their own. Accompanying manual lands you on TSR's and debugging ON DAY ONE.
You need not keep looking for a library for code that handles files with long file names, for example. You can write all by yourself. Sometimes, half way through, you get the "can do anything" feeling that is priceless. Other programming languages (except database languages) grill you more than the power they can deliver into your hands (even after years, sometimes).
If you are in need of endless excitement, you can get down to calling BIOS and DOS interrupts.
If you are on WINDOWS 98SE or below, this is your last chance before you upgrade.
Your CPU Registers are waiting.
If all this is hype in favor of an old programming language, pray for more godfathers.