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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If appended with a character h it is assumed to be in hexadecimal form. Labels must always be placed in the first column and must be followed by an instruction no empty line. After all, I am using my spare time to do all these things. It can be used to give names only to numeric constants. Writing a BIG manual on instructions seems to be redundant and time consuming.

But don’t get upset!

GNUSim8085 Assembly Language Guide

DB – define byte 8 bits DS – define size no. And this comment should start at first gnksim8085. But for this program, everytime you load it, you have to set the breakpoints. DB is used to define space for an array of values specified by comma seperated list. Comments Comments start with a semi-colon.

But it has different meaning when given to EQU directive. Constant addresses should be used with caution. Gnuzim8085 can use EQU only in operands for pseudo ops and mneumonics.


This can be automated.

GNUSim Assembly Language Guide

Now I can give a breakpoint at the place where the program finds the next solution. Labels must be followed by a: Auto breakpoints As you get acquainted with the application, you can use breakpoints to debug your program.

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. Anything after ; is ignored by the assembler, except to one important character sequence There are example programs in the docs section, which you can get used to!

Pseudo Ops There are only 3 directives currently available in our assembly language.

Note As you can see EQU defined labels can be used to give descriptive names to constants. And the label if given to the begining of DB is assigned the address of the first data item. Nesting of EQU is not allowed. EQU behaves similar to define in C.


As you can see EQU defined labels can be used to give descriptive names to constants. Unless otherwise specified, a constant which is always numberic is in decimal form. Then it takes the operand of EQU as its value. The sequence is ; If ; is encountered, the editor will set breakpoint in the next line. You should use them frequently in your program in order to avoid magic numbers.


In addition, you have constants in an assembly program.

Mnemonics After all, I am using my spare time to uttorial all these things. For obvious reasons, you can’t set a breakpoint at first line in your program.

You can refer many available text books on programming for this.

GNUSim – Wikipedia

In this example 3 bytes are assigned. When the tutoral is reached, I can stop and see the solution by examining the variables and then continue for the next solution. As you can see in the previous example, comments can be yutorial to any part of the program.

But in that I can see only the last solution, since solutions are overwritten by subsequent ones. LDA h will be 3a 00 22 in machine code.

But it is simple. But for certain programs, you have to display something to the user before continuing.

In my system, it took almost 1 minute to computer all the solutions. For an example, look at the N-Queens program in the docs section nqueens. So the actual address is again h! Comments start with a gnuism8085. If ; is encountered, the editor will set breakpoint in the next line.