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SIC Simulator and Assembler

SIC Simulator and Assembler. How to convert your source program to Object program. Place the SIC folder in directory C: Make sure the SIC folder contains a folder, possibly empty, called “files”. The “files” folder is the target folder for the assembler.

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SIC Simulator and Assembler

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  1. SIC Simulator and Assembler

  2. How to convert your source program to Object program • Place the SIC folder in directory C: • Make sure the SIC folder contains a folder, possibly empty, called “files”. • The “files” folder is the target folder for the assembler. • The program assembler.exe contains a text editor, the assembler, the loader and a shortcut to simulator as well. So, it is All-in-One :)

  3. How to convert your source program to Object program (cont.) • Write your source code in any text file. • Run assembler.exe and open your source code file from File->Open (or you can use the editor embedded in it. • If your program contains macros, select “ExpandMacro” command from the “MacroProcessing” menu, then proceed to the next step. • Choose “Assemble” command from the “Assembling” menu.

  4. How to convert your source program to Object program (cont.) • If successfully assembled, you will get a message saying so, and 3 files will be created in the “files” folder. • Output: • LISAFILE.txt (program listing) • OBJFILE.txt (object program) • INTFILE.txt (just contains a specially-formatted version of your source code) [not important]

  5. How to convert your source program to Object program (cont.) • Next step is to load your object code and run it on the simulator. • From the “Load” menu, select “Load” command. A new file “LISLFILE” is generated, which is the loader's output list file. • Run the simulator by either selecting “SIC Sim” from the assembler or explicitly run sim.exe in the SIC folder.

  6. Program listing

  7. Object program

  8. How to run your program • Run sim.exe • The following screen appears

  9. Simulator commands(1) • F1: enter data to registers/memory: • You select the name of the register or the starting memory address, and you can enter the data manually. • F2: dump conentes of registers/memory • You can view the current data written in the registers/memory • Very useful for tracing your program during execution.

  10. Simulator commands(2) • F3: Execute the loaded program, you have 4 options: • F3->F1: Execute till break point. You'll get to enter the address of the break point. You can continue execution after the break point by selecting one of the four options again. • F3->F2: Halt after executing a user defined number of instructions. You can continue execution after that by selecting one of the four options again. • F3->F3: Execute instruction by instruction • F3->F4: Execute till “J *” instruction is reached!

  11. Simulator commands(3) • F4: Rest machine and reload program (refresh)

  12. I/O Devices • The simulator supports six simulated SIC devices for use by the program • Devices F1, F2, and F3 (file names DEVF1, DEVF2, and DEVF3) can be used only for input • Devices 04, 05, and 06 (file names DEV04, DEV05, and DEV06) can be used only for output. • In any of these files, each byte of data is represented as one character. • On input, an end-of-line is read as hexadecimal 00; an end-of-file is read as hexadecimal 04. \ • On output, writing a hexadecimal 00 causes an end-of-line to be inserted. • An attempt to execute an RD or WD instruction before the device is ready will cause an error message.

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