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 básico en assembler GNUSIM consiste de 4 partes: a.
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Comments Comments start with a semi-colon. For an example, look at the N-Queens program in the docs section nqueens. So the actual address is again h! But for this program, everytime you load it, you have to set the breakpoints. Thats all for now folks! In addition, you have constants in an assembly program.
DB is used to define space for an array of values specified by comma seperated list. Mnemonics After all, I am using my spare time to do all these things. Final notes Don’t forget to include the HLT instruction somewhere else in the program to terminate it, otherwise gnnusim8085 will be fooled! 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 ngusim8085 by the assembler, except to one important character sequence EQU behaves similar to define in C. But don’t get upset! If appended with a character h it is assumed to be in hexadecimal form.
As you get acquainted with the application, you can use breakpoints to debug your program. And this comment should start at first column. There are example gnusim085 in the docs section, which you can get used to! When the breakpoint is reached, I can stop and see the solution by examining the variables and then continue for the next solution.
Comments start with a semi-colon. Labels must always be placed in the first column and must be followed by an instruction no empty line.
Nesting of EQU is not allowed. Auto breakpoints As you get acquainted with the application, you can use breakpoints to debug your program. Unless otherwise specified, a constant which is always numberic is in decimal form. Now I can give a breakpoint at the tutorail where the program finds the next solution. It can be used to give names only to numeric constants. Machine operations mnemonics Pseudo operations like preprocessor in C Labels Comments In addition, you have constants in an assembly program.
In my system, it took almost 1 minute to computer all the solutions. You can use EQU only in operands for pseudo ops and mneumonics. And the label if given to the begining of DB is assigned the address of the first data item.
Labels must be followed by a: Writing a BIG manual on instructions seems to be redundant and time consuming.
In this example 3 bytes are assigned. But it is simple. Note that 56h is actually considered to be a hex constant. This can be automated.
Here finding all the solutions for say 8 queens is time consuming it involves a total of 92 solutions. A perfect example for this is the N-Queens problem. You should use them frequently in your program in order to avoid magic numbers.
GNUSim – Wikipedia
But for certain programs, you have to display something to tutorual user before continuing. For obvious reasons, you can’t set a breakpoint at first line in your program. Gnusiim8085 sequence is ; If ; is encountered, the editor will set breakpoint in the next line. But in that I can see only the last solution, since solutions are overwritten by subsequent ones. If ; is encountered, the editor will set breakpoint in the next line.
Note As you can see EQU defined labels can be used to give descriptive names to constants.