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<!doctype HTML public "-//W3O//DTD W3 HTML 3.0//EN"><HTML><HEAD><TITLE>Using Emulator</TITLE><META name="description" content="Using Emulator"><META name="keywords" content="using emulator, simulator, reference, description, hints"><META name="robots" content="nofollow"></HEAD><BODY bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#007099" alink="#FF0000"><TABLE WIDTH=80%><TR><TD><FONT FACE="Verdana" SIZE=3><FONT SIZE=+2><B>Using Emulator</B></FONT><BR><BR><BR>If you want to load your code into the emulator, just click "<B>Emulate</B>" button<IMG SRC="emulator01.gif" width="18" height="18">.<BR>But you can also use emulator to load executables even if you don't havethe original source code. Select "<B>Show Emulator</B>" from "<B>Emulator</B>" menu.<BR><BR><IMG SRC="emulator02.gif" WIDTH=678 HEIGHT=427><BR><BR>Try loading files from "<B>MyBuild</B>" folder. If there are no files in "<B>MyBuild</B>" folderreturn to source editor, select <I>Samples</I> from <I>File</I> menu, load any sample, compile it andthen load into the emulator:<BR><BR><IMG SRC="emulator03.gif" WIDTH=646 HEIGHT=497><BR><BR>[<B>Single Step</B>] button executes instructions one by one stopping aftereach instruction.<BR><BR>[<B>Run</B>] button executes instructions one by one with delay set by <B>step delay</B>between instructions.<BR><BR>Double click on register text-boxes opens "<B>Extended Viewer</B>" windowwith value of that register converted to all possible forms. You can modify thevalue of the register directly in this window.<BR><BR>Double click on memory list item opens "<B>Extended Viewer</B>" with WORD value loaded frommemory list at selected location.Less significant byte is at lower address: LOW BYTE is loadedfrom selected position and HIGH BYTE from next memory address.You can modify the value of the memory word directly in the "<B>Extended Viewer</B>" window,<BR><BR>You can modify the values of registers on runtime by typing over the existing values.<BR><BR>[<B>Flags</B>] button allows you to view and modify flags on runtime.<BR><BR><HR><FONT SIZE=+2><B>Virtual Drives</B></FONT><BR><BR>Emulator supports up to 4 virtual floppy drives. By default there isa <B>FLOPPY_0</B> file that is an image of a real floppy disk (the size ofthat file is exactly 1,474,560 bytes).<BR><BR>To add more floppy drives select <NOBR><B>[Create new floppy drive]</B></NOBR> from<NOBR><B>[Virtual Drive]</B></NOBR> menu. Each time you add a floppy drive emulatorcreates a <B>FLOPPY_1</B>, <B>FLOPPY_2</B>, and <B>FLOPPY_3</B> files.<BR>Created floppy disks are images of empty IBM/MS-DOS formatted disk images.Only <B>4</B> floppy drives are supported (0..3)!<BR>To <B>delete</B> a floppy drive you should close the emulator, delete therequired file manually and restart the emulator.<BR><BR>You can determine the number of attached floppy drives using <B>INT 11h</B>this function returns <B>AX</B> register with BIOS equipment list. Bits 7 and 6define the number of floppy disk drives (minus 1):<PRE>Bits 7-6 of AX: 00 single floppy disk. 01 two floppy disks. 10 three floppy disks. 11 four floppy disks.</PRE>Emulator starts counting attached floppy drives from starting from the first,in case file <B>FLOPPY_1</B> does not exist it stops the checkand ignores <B>FLOPPY_2</B> and <B>FLOPPY_3</B> files.<BR><BR>To write and read from floppy drive you can use <B>INT 13h</B> function,see <A HREF="supported_interrupts.html"><B>list of supported interrupts</B></A> for more information.<BR><BR>Ever wanted to write your own operating system?<BR><BR><BLOCKQUOTE> You can write a boot sector of a virtual floppy via menu in emulator:<BR> <B>[Virtual Drive] -> [Write 512 bytes at 7C00 to Boot Sector]</B> <BR> First you should compile a "<B>.boot</B>" file and load it in emulator (see "<B>micro-os_loader.asm</B>" and "<B>micro-os_kernel.asm</B>" in "Samples" for more info). <BR><BR> Then select <B>[Virtual Drive] -> [Boot from Floppy]</B> menu to boot emulator from a virtual floppy. <BR><BR> Then, if you are curious, you may write the virtual floppy to real floppy and boot your computer from it, I recommend using "RawWrite for Windows" from: <A HREF="http://uranus.it.swin.edu.au/~jn/linux/rawwrite.htm"> <B>http://uranus.it.swin.edu.au/~jn/linux/rawwrite.htm</B></A><BR> (note that "<B>micro-os_loader.asm</B>" is not using MS-DOS compatible boot sector, so it's better to use and empty floppy, although it should be IBM (MS-DOS) formatted). <BR><BR> Compiler directive <B>ORG 7C00h</B> should be added before the code, when computer starts it loads first track of a floppy disk at the address 0000:7C00. <BR> The size of a <B>.BOOT</B> file should be less then 512 bytes (limited by the size of a disk sector).</BLOCKQUOTE><BR><HR><BR></FONT></TD></TR></TABLE><BR></BODY></HTML>⌨️ 快捷键说明
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