GNUSim Assembly Language Guide – Free download as PDF File .pdf), Text File .txt) or read online for free. gui. The /A has six general-purpose registers to store 8-bit data; these are identified as B,C,D,E,H, and L as shown in the figure. They can be combined as. GNUSIM simula el comportamiento del procesador Intel (r) , el cual es la Un programa b├ísico en assembler GNUSIM consiste de 4 partes: a.

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Here finding all the solutions for say 8 queens is time consuming it involves a total tutoorial 92 solutions. But for certain programs, you have to display something to the user before continuing.

The sequence is ; If ; is encountered, the editor will set breakpoint in the next line. After all, I am using my spare time to do all these things.

As you can see Tutirial defined labels can be used to give descriptive names to constants. Pseudo Ops There are only 3 directives currently available in our assembly language.

As you can see in the previous example, comments can be given to any part of the program. Comments Comments start with a semi-colon.

Microprocessor Instruction Sets

You should use them frequently in your program in order to avoid magic numbers. There are example programs in the docs section, which you can get used to! It can be used to give names only to numeric constants.


When the tutoril is reached, I can stop and see the solution by examining the variables and then continue for the next solution. In my system, it took almost 1 minute to computer all the solutions. LDA h will be 3a 00 22 in machine code.

But it has different meaning when given to EQU directive. Labels must always be placed in the first column and must be followed by an tutorila no empty line. Comments start with a semi-colon. Auto breakpoints As you get acquainted with the application, you can use breakpoints to debug your program.

This can be automated. Machine operations mnemonics Pseudo operations like preprocessor in Tutoril Labels Comments In addition, you have constants in an assembly program. And the label if given to the begining of DB is assigned the address of the first data item.

Now I can give a breakpoint at the place where the program finds the next solution. Unless otherwise specified, a constant which is always numberic is in decimal form.


If a hex constant starts with an alpha-char don’t forget to include the number 0 in the begining, since that will help the assembler to differentiate between a label and a constant. To set the breakpoint when the program is loaded at line number nyou have to put a special comment at line n Writing a BIG manual on instructions seems to be redundant and time consuming.

DB is used to define space for an array of values specified by comma seperated list. But for this program, everytime you load it, you have to set the breakpoints.


Nesting of EQU is not allowed. EQU behaves similar to define in C.

GNUSim8085 Assembly Language Guide

But don’t get upset! DS is used to define the specified number of bytes to be assigned and initialize them to zero. You can refer many available text books on programming for this. For an example, look at the N-Queens program in the docs section nqueens.

GNUSim – Wikipedia

Anything after ; is ignored by the assembler, except tuotrial one important character sequence In addition, you have constants in an assembly program.

Final notes Don’t forget to tutoiral the HLT instruction somewhere else in the program to terminate it, otherwise you will be fooled! If appended with a character h it is assumed to be in hexadecimal form. But it is simple. Constant addresses should be used with caution.

For obvious reasons, you can’t set a breakpoint at first line in your program. As you get acquainted with the application, you can use breakpoints to debug your program.

A perfect example for this is the N-Queens problem.