diff --git a/Quake/cl_parse.c b/Quake/cl_parse.c
index 233675e3..c769973a 100644
--- a/Quake/cl_parse.c
+++ b/Quake/cl_parse.c
@@ -234,7 +234,7 @@ void CL_KeepaliveMessage (void)
 	memcpy (net_message.data, olddata, net_message.cursize);
 
 // check time
-	time = Sys_FloatTime ();
+	time = Sys_DoubleTime ();
 	if (time - lastmsg < 5)
 		return;
 	lastmsg = time;
diff --git a/Quake/console.c b/Quake/console.c
index 6245f243..5b5d846f 100644
--- a/Quake/console.c
+++ b/Quake/console.c
@@ -1235,10 +1235,10 @@ void Con_NotifyBox (const char *text)
 
 	do
 	{
-		t1 = Sys_FloatTime ();
+		t1 = Sys_DoubleTime ();
 		SCR_UpdateScreen ();
 		Sys_SendKeyEvents ();
-		t2 = Sys_FloatTime ();
+		t2 = Sys_DoubleTime ();
 		realtime += t2-t1;		// make the cursor blink
 	} while (key_count < 0);
 
diff --git a/Quake/gl_rmain.c b/Quake/gl_rmain.c
index bb4baf98..6dfc2627 100644
--- a/Quake/gl_rmain.c
+++ b/Quake/gl_rmain.c
@@ -790,7 +790,7 @@ void R_RenderView (void)
 	if (r_speeds.value)
 	{
 		glFinish ();
-		time1 = Sys_FloatTime ();
+		time1 = Sys_DoubleTime ();
 
 		//johnfitz -- rendering statistics
 		rs_brushpolys = rs_aliaspolys = rs_skypolys = rs_particles = rs_fogpolys = rs_megatexels =
@@ -838,7 +838,7 @@ void R_RenderView (void)
 	//johnfitz
 
 	//johnfitz -- modified r_speeds output
-	time2 = Sys_FloatTime ();
+	time2 = Sys_DoubleTime ();
 	if (r_speeds.value == 2)
 		Con_Printf ("%3i ms  %4i/%4i wpoly %4i/%4i epoly %3i lmap %4i/%4i sky %1.1f mtex\n",
 					(int)((time2-time1)*1000),
diff --git a/Quake/gl_rmisc.c b/Quake/gl_rmisc.c
index 521656fe..0b9cf8ad 100644
--- a/Quake/gl_rmisc.c
+++ b/Quake/gl_rmisc.c
@@ -386,7 +386,7 @@ void R_TimeRefresh_f (void)
 	glDrawBuffer  (GL_FRONT);
 	glFinish ();
 
-	start = Sys_FloatTime ();
+	start = Sys_DoubleTime ();
 	for (i=0 ; i<128 ; i++)
 	{
 		r_refdef.viewangles[1] = i/128.0*360.0;
@@ -394,7 +394,7 @@ void R_TimeRefresh_f (void)
 	}
 
 	glFinish ();
-	stop = Sys_FloatTime ();
+	stop = Sys_DoubleTime ();
 	time = stop-start;
 	Con_Printf ("%f seconds (%f fps)\n", time, 128/time);
 
diff --git a/Quake/gl_screen.c b/Quake/gl_screen.c
index d1f73649..2748ca36 100644
--- a/Quake/gl_screen.c
+++ b/Quake/gl_screen.c
@@ -870,14 +870,14 @@ int SCR_ModalMessage (const char *text, float timeout) //johnfitz -- timeout
 
 	S_ClearBuffer ();		// so dma doesn't loop current sound
 
-	time1 = Sys_FloatTime () + timeout; //johnfitz -- timeout
+	time1 = Sys_DoubleTime () + timeout; //johnfitz -- timeout
 	time2 = 0.0f; //johnfitz -- timeout
 
 	do
 	{
 		key_count = -1;		// wait for a key down and up
 		Sys_SendKeyEvents ();
-		if (timeout) time2 = Sys_FloatTime (); //johnfitz -- zero timeout means wait forever.
+		if (timeout) time2 = Sys_DoubleTime (); //johnfitz -- zero timeout means wait forever.
 	} while (key_lastpress != 'y' &&
 			 key_lastpress != 'n' &&
 			 key_lastpress != K_ESCAPE &&
diff --git a/Quake/host.c b/Quake/host.c
index 8762d8b8..7fff5435 100644
--- a/Quake/host.c
+++ b/Quake/host.c
@@ -482,7 +482,7 @@ void Host_ShutdownServer(qboolean crash)
 		CL_Disconnect ();
 
 // flush any pending messages - like the score!!!
-	start = Sys_FloatTime();
+	start = Sys_DoubleTime();
 	do
 	{
 		count = 0;
@@ -502,7 +502,7 @@ void Host_ShutdownServer(qboolean crash)
 				}
 			}
 		}
-		if ((Sys_FloatTime() - start) > 3.0)
+		if ((Sys_DoubleTime() - start) > 3.0)
 			break;
 	}
 	while (count);
@@ -728,14 +728,14 @@ void _Host_Frame (float time)
 
 // update video
 	if (host_speeds.value)
-		time1 = Sys_FloatTime ();
+		time1 = Sys_DoubleTime ();
 
 	SCR_UpdateScreen ();
 
 	CL_RunParticles (); //johnfitz -- seperated from rendering
 
 	if (host_speeds.value)
-		time2 = Sys_FloatTime ();
+		time2 = Sys_DoubleTime ();
 
 // update audio
 	BGM_Update();	// adds music raw samples and/or advances midi driver
@@ -752,7 +752,7 @@ void _Host_Frame (float time)
 	if (host_speeds.value)
 	{
 		pass1 = (time1 - time3)*1000;
-		time3 = Sys_FloatTime ();
+		time3 = Sys_DoubleTime ();
 		pass2 = (time2 - time1)*1000;
 		pass3 = (time3 - time2)*1000;
 		Con_Printf ("%3i tot %3i server %3i gfx %3i snd\n",
@@ -776,9 +776,9 @@ void Host_Frame (float time)
 		return;
 	}
 
-	time1 = Sys_FloatTime ();
+	time1 = Sys_DoubleTime ();
 	_Host_Frame (time);
-	time2 = Sys_FloatTime ();
+	time2 = Sys_DoubleTime ();
 
 	timetotal += time2 - time1;
 	timecount++;
diff --git a/Quake/host_cmd.c b/Quake/host_cmd.c
index 76963080..2943f433 100644
--- a/Quake/host_cmd.c
+++ b/Quake/host_cmd.c
@@ -1626,7 +1626,7 @@ void Host_Spawn_f (void)
 		pr_global_struct->self = EDICT_TO_PROG(sv_player);
 		PR_ExecuteProgram (pr_global_struct->ClientConnect);
 
-		if ((Sys_FloatTime() - host_client->netconnection->connecttime) <= sv.time)
+		if ((Sys_DoubleTime() - host_client->netconnection->connecttime) <= sv.time)
 			Sys_Printf ("%s entered the game\n", host_client->name);
 
 		PR_ExecuteProgram (pr_global_struct->PutClientInServer);
diff --git a/Quake/main_sdl.c b/Quake/main_sdl.c
index deace66f..647b286d 100644
--- a/Quake/main_sdl.c
+++ b/Quake/main_sdl.c
@@ -73,18 +73,18 @@ int main(int argc, char *argv[])
 	Sys_Printf("Host_Init\n");
 	Host_Init();
 
-	oldtime = Sys_FloatTime();
+	oldtime = Sys_DoubleTime();
 	if (isDedicated)
 	{
 		while (1)
 		{
-			newtime = Sys_FloatTime ();
+			newtime = Sys_DoubleTime ();
 			time = newtime - oldtime;
 
 			while (time < sys_ticrate.value )
 			{
 				SDL_Delay(1);
-				newtime = Sys_FloatTime ();
+				newtime = Sys_DoubleTime ();
 				time = newtime - oldtime;
 			}
 
@@ -168,7 +168,7 @@ int main(int argc, char *argv[])
 			}
 		}
 
-		newtime = Sys_FloatTime();
+		newtime = Sys_DoubleTime();
 		time = newtime - oldtime;
 		Host_Frame(time);
 
diff --git a/Quake/net_main.c b/Quake/net_main.c
index f2d7e98a..e636134c 100644
--- a/Quake/net_main.c
+++ b/Quake/net_main.c
@@ -75,7 +75,7 @@ double		net_time;
 
 double SetNetTime (void)
 {
-	net_time = Sys_FloatTime();
+	net_time = Sys_DoubleTime();
 	return net_time;
 }
 
@@ -291,7 +291,7 @@ void NET_Slist_f (void)
 	}
 
 	slistInProgress = true;
-	slistStartTime = Sys_FloatTime();
+	slistStartTime = Sys_DoubleTime();
 
 	SchedulePollProcedure(&slistSendProcedure, 0.0);
 	SchedulePollProcedure(&slistPollProcedure, 0.1);
@@ -311,7 +311,7 @@ static void Slist_Send (void *unused)
 		dfunc.SearchForHosts (true);
 	}
 
-	if ((Sys_FloatTime() - slistStartTime) < 0.5)
+	if ((Sys_DoubleTime() - slistStartTime) < 0.5)
 		SchedulePollProcedure(&slistSendProcedure, 0.75);
 }
 
@@ -330,7 +330,7 @@ static void Slist_Poll (void *unused)
 	if (! slistSilent)
 		PrintSlist();
 
-	if ((Sys_FloatTime() - slistStartTime) < 1.5)
+	if ((Sys_DoubleTime() - slistStartTime) < 1.5)
 	{
 		SchedulePollProcedure(&slistPollProcedure, 0.1);
 		return;
@@ -648,7 +648,7 @@ int NET_SendToAll (sizebuf_t *data, double blocktime)
 		}
 	}
 
-	start = Sys_FloatTime();
+	start = Sys_DoubleTime();
 	while (count)
 	{
 		count = 0;
@@ -683,7 +683,7 @@ int NET_SendToAll (sizebuf_t *data, double blocktime)
 				continue;
 			}
 		}
-		if ((Sys_FloatTime() - start) > blocktime)
+		if ((Sys_DoubleTime() - start) > blocktime)
 			break;
 	}
 	return count;
@@ -826,7 +826,7 @@ void SchedulePollProcedure(PollProcedure *proc, double timeOffset)
 {
 	PollProcedure *pp, *prev;
 
-	proc->nextTime = Sys_FloatTime() + timeOffset;
+	proc->nextTime = Sys_DoubleTime() + timeOffset;
 	for (pp = pollProcedureList, prev = NULL; pp; pp = pp->next)
 	{
 		if (pp->nextTime >= proc->nextTime)
diff --git a/Quake/net_wins.c b/Quake/net_wins.c
index b3e17676..53aa67d6 100644
--- a/Quake/net_wins.c
+++ b/Quake/net_wins.c
@@ -50,7 +50,7 @@ static INT_PTR PASCAL FAR BlockingHook (void)
 	MSG	msg;
 	BOOL	ret;
 
-	if ((Sys_FloatTime() - blocktime) > 2.0)
+	if ((Sys_DoubleTime() - blocktime) > 2.0)
 	{
 		WSACancelBlockingCall();
 		return FALSE;
@@ -90,7 +90,7 @@ static void WINS_GetLocalAddress (void)
 	}
 
 	buff[MAXHOSTNAMELEN - 1] = 0;
-	blocktime = Sys_FloatTime();
+	blocktime = Sys_DoubleTime();
 	WSASetBlockingHook(BlockingHook);
 	local = gethostbyname(buff);
 	err = WSAGetLastError();
diff --git a/Quake/sys.h b/Quake/sys.h
index 5d4594cd..9ee8f0ba 100644
--- a/Quake/sys.h
+++ b/Quake/sys.h
@@ -29,8 +29,7 @@ void Sys_Init (void);
 // file IO
 //
 
-// returns the file size
-// return -1 if file is not present
+// returns the file size or -1 if file is not present.
 // the file should be in BINARY mode for stupid OSs that care
 int Sys_FileOpenRead (const char *path, int *hndl);
 
@@ -53,13 +52,12 @@ void Sys_Printf (const char *fmt, ...) __attribute__((__format__(__printf__,1,2)
 
 void Sys_Quit (void) __attribute__((__noreturn__));
 
-double Sys_FloatTime (void);
+double Sys_DoubleTime (void);
 
 const char *Sys_ConsoleInput (void);
 
-void Sys_Sleep (void);
-// called to yield for a little bit so as
-// not to hog cpu when paused or debugging
+void Sys_Sleep (unsigned long msecs);
+// yield for about 'msecs' milliseconds.
 
 void Sys_SendKeyEvents (void);
 // Perform Key_Event () callbacks until the input que is empty
diff --git a/Quake/sys_sdl_unix.c b/Quake/sys_sdl_unix.c
index 141e6ee3..502c87ee 100644
--- a/Quake/sys_sdl_unix.c
+++ b/Quake/sys_sdl_unix.c
@@ -197,7 +197,7 @@ void Sys_Quit (void)
 	exit (0);
 }
 
-double Sys_FloatTime (void)
+double Sys_DoubleTime (void)
 {
 	return SDL_GetTicks() / 1000.0;
 }
@@ -253,8 +253,9 @@ const char *Sys_ConsoleInput (void)
 	return NULL;
 }
 
-void Sys_Sleep (void)
+void Sys_Sleep (unsigned long msecs)
 {
+	usleep (msecs * 1000);
 }
 
 void Sys_SendKeyEvents (void)
diff --git a/Quake/sys_sdl_win.c b/Quake/sys_sdl_win.c
index 36765eb8..1c891db7 100644
--- a/Quake/sys_sdl_win.c
+++ b/Quake/sys_sdl_win.c
@@ -272,7 +272,7 @@ void Sys_Quit (void)
 	exit (0);
 }
 
-double Sys_FloatTime (void)
+double Sys_DoubleTime (void)
 {
 	return SDL_GetTicks() / 1000.0;
 }
@@ -346,8 +346,9 @@ const char *Sys_ConsoleInput (void)
 	return NULL;
 }
 
-void Sys_Sleep (void)
+void Sys_Sleep (unsigned long msecs)
 {
+	Sleep (msecs);
 }
 
 void Sys_SendKeyEvents (void)