8086 Disassembler Download Hack
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This gets to the other sense of your query: "I want to make a disassembler". The source for ndisasm is available, and it handles many of the descendants of 8086, not just 8086, itself (which seriously clutters it, if all you want is an 8086 or even 80386 disassembler), but it is not self-contained and has a heavy dependency on the rest of the distribution.
And then you've just disassembled a disassembler that also happens to do CPU emulation, like Fake86 does - but only for the 8086. You'll have to make the absolute addresses relative (using the original relocation table as a guide), to make is re-assemblable. Once you do that, you can work on the source. The opcode table is in clear view (if you display it as text) - both when seen in the packed and unpacked versions of debug.exe.
I might port the DAS disassembler to the x86, since items (a)-(f) are already incorporated into DAS's design. I've only ever ported it to the 8051, 6800, 6809 and 8080/8085 (and Z80) up to now; but the transition from 8085 to 8086 is relatively small. To that end, I might hack something out of Fake86. That's mostly abandonware, now, since the author replaced it by XTulator, as Fake86 was written when the programmer was relatively new to C. You might also be able to hack something directly out of DosDebug's opcode tables (their "instr.*" files).
Extended mnemonics are often used to support specialized uses of instructions, often for purposes not obvious from the instruction name. For example, many CPU's do not have an explicit NOP instruction, but do have instructions that can be used for the purpose. In 8086 CPUs the instruction xchg ax,ax is used for nop, with nop being a pseudo-opcode to encode the instruction xchg ax,ax. Some disassemblers recognize this and will decode the xchg ax,ax instruction as nop. Similarly, IBM assemblers for System/360 and System/370 use the extended mnemonics NOP and NOPR for BC and BCR with zero masks. For the SPARC architecture, these are known as synthetic instructions.
Assembler with Microprocessor Simulator 8086 is the perfect solution to debug short programs and to study assembly language programming as part of a computer science course.Emulator runs programs on a Virtual Machine, it emulates real hardware, such as screen, memory and input/output devices. 8086 instruction set is the ABC for all modern computing, it's the base of all microprocessors including Pentium and Athlon. 8086 is the computer DNA code. Though internal assembler is primitive compared to those developed by Borland and Microsoft, all Intel's instructions and even some MASM and TASM directives are supported. It's ideal for Computer Architecture study. Emu8086 combines an advanced source editor, assembler, disassembler, software emulator (Virtual PC) with debugger, and step by step tutorials.This program is extremely helpful for those who just begin to study assembly language. It compiles the source code and executes it on emulator step by step.Visual interface is very easy to work with. You can watch registers, flags and memory while your program executes. Arithmetic & Logical Unit (ALU) shows the internal work of the central processor unit (CPU).Emulator runs programs on a Virtual PC, this completely blocks your program from accessing real hardware, such as hard-drives and memory, since your assembly code runs on a virtual machine, this makes debugging much easier.8086 machine code is fully compatible with all next generations of Intel's micro-processors, including Pentium II and Pentium 4, I'm sure Pentium 5 will support 8086 as well. This makes 8086 code very portable, since it runs both on ancient and on the modern computer systems. Another advantage of 8086 instruction set is that it is much smaller, and thus easier to learn. Everything for learning assembly language in one pack!
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I used to have a Tandy/Radio Shack TRS-80 model 1 (with an Z80 processor) and wrote a disassembler in Basic to disassemble the 12K ROM and figured out large portions of the code and was very impressed! But I also noticed that some portions of the code were written for the 8080 and other portions also used the extended Z80 instructions. BTW. later I also wrote a TRS-80 emulator. 2b1af7f3a8