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 tuttorial h it is assumed to be in hexadecimal form. When the breakpoint is reached, I can stop and see the solution by examining the variables and then continue for the next solution.

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. Nesting of EQU is not allowed. The sequence is ; If ; is encountered, the editor will set breakpoint in the next line. Mnemonics After all, I am using my spare time to do all these things.

LDA h will be 3a 00 22 in machine code. And the label if given to the begining of DB is assigned the address of the first data item.

As you can see in the previous example, comments can be given to any part of the program. You can refer many available text books on programming for this.



Anything after ; is ignored by the assembler, except to one important character sequence Yutorial is used to define space for an array of values specified by comma seperated list. But it is simple. You should use them frequently in your program in order to avoid magic numbers.

Auto breakpoints As you get acquainted with the application, you can use breakpoints to debug your program. There are example programs in the docs section, which you can get used to! If ; is encountered, the editor will set breakpoint in the next line.

But don’t get upset! Pseudo Ops There are only 3 directives currently available in our assembly language. Labels must always be placed in the first column and must be followed by an instruction no empty line.

Here finding all the solutions for say 8 queens is time consuming it involves a total of 92 solutions.

GNUSim Assembly Language Guide

Then it takes the operand of EQU as its value. But it has different meaning when given to EQU directive. Machine operations mnemonics Pseudo operations like preprocessor in C Labels Comments In addition, you have constants in an assembly program. Comments start with a semi-colon.

To set the breakpoint when the program is loaded at line number nyou have to put a special comment at line n And this comment should start at first column. So the actual address is again h! Now I can give a breakpoint at the place where the program finds the next gnsim8085.

As you can see EQU defined labels can be used to give descriptive names to constants. But for certain programs, you have to display something to the user before continuing. EQU behaves similar to define in C.


A perfect example for this is the N-Queens problem. You can use EQU only in operands for pseudo gnuskm8085 and mneumonics. DB – define byte 8 bits DS – define size no.

Microprocessor – 8085 Instruction Sets

In my system, it took almost 1 minute to computer all the solutions. Labels must be followed by a: It can be used to give names only to numeric constants.

After all, I am using my spare time to do all these things. Writing a BIG manual on instructions seems to be redundant and gnuwim8085 consuming.

Microprocessor Instruction Sets

For an example, look at the N-Queens program in the docs section nqueens. This can be automated. But in that I can see only the last solution, since solutions are overwritten by subsequent ones.

For obvious reasons, you can’t set a breakpoint at first line in your program. Comments Tutodial start with a semi-colon. Constant addresses should be used with caution. DS is used to define the specified number of bytes to be assigned and initialize them to zero.

But for this program, everytime you load it, you have to set the breakpoints.