06-26-2011
Most CPU opcodes just move memory around. It's the devices attached to the I/O ports that make it useful. Check out this JavaScript PC emulator:
Javascript PC Emulator
The only external device he's emulated is the serial port. I suppose it catches the memory getting put into 0x3f8 and those go to his host's terminal.
It's tough to correctly emulate a foreign machine. Sometimes the code modifies itself. You can't often step through it, replace it with host machine equivalent, and save the output. There would be differences in memory locations for one.
If you'd like to start with something easy, the 6502 CPU would be a great start. It's super-old but I found a 6502 core in an embedded IC recently and was having fun with
6502asm.com - 6502 compatible assembler and emulator in javascript learning it.
This User Gave Thanks to neutronscott For This Post:
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LEARN ABOUT DEBIAN
ns_relativeurl
Ns_Url(3aolserver) AOLserver Library Procedures Ns_Url(3aolserver)
__________________________________________________________________________________________________________________________________________________
NAME
Ns_AbsoluteUrl, Ns_ParseUrl, Ns_RelativeUrl, Ns_SkipUrl - URL manipulation routines
SYNOPSIS
#include "ns.h"
int
Ns_AbsoluteUrl(Ns_DString *pds, char *url, char *baseurl)
int
Ns_ParseUrl(char *url, char **pprotocol, char **phost,
char **pport, char **ppath, char **ptail)
char *
Ns_RelativeUrl(char *url, char *location)
char *
Ns_SkipUrl(Ns_Request *request, int n)
_________________________________________________________________
DESCRIPTION
Ns_AbsoluteUrl(pds, url, baseurl)
Construct an URL based on baseurl but with as many parts of the incomplete url as possible. Return NS_OK or NS_ERROR.
Ns_ParseUrl(url, pprotocol, phost, pport, ppath, ptail)
Parse a URL into its component parts. Pointers to the protocol, host, port, path, and "tail" (last path element) will be set by ref-
erence in the passed-in pointers. The passed-in url will be modified.
Ns_RelativeUrl(url, location)
If the url passed in is for this server, then the initial part of the URL is stripped off. e.g., on a server whose location is
http://www.foo.com, Ns_RelativeUrl of "http://www.foo.com/hello" will return "/hello". Returns a pointer to the beginning of the
relative url in the passed-in url, or NULL if error. Will set errno on error.
Ns_SkipUrl(request, n)
Return a pointer n elements into the request's url.
SEE ALSO
nsd(1), info(n)
KEYWORDS
AOLserver 4.0 Ns_Url(3aolserver)