diff --git a/client/nb65/nb65_c64.s b/client/nb65/nb65_c64.s
index 7223d47..93c5ecc 100644
--- a/client/nb65/nb65_c64.s
+++ b/client/nb65/nb65_c64.s
@@ -102,12 +102,14 @@ exit_cart:
   sta $0001   ;turns off ordinary cartridge by modifying HIRAM/LORAM (this will also bank out BASIC)
 .endif
 
+get_value_of_axy: ;some more self-modifying code
+	lda $ffff,y
+  rts
+
 call_downloaded_prg: 
    jsr $0000 ;overwritten when we load a file
    jmp init
    
-	.bss
-
 
 
 .segment "CARTRIDGE_HEADER"
@@ -378,18 +380,22 @@ cmp #KEYCODE_F7
   
 @tftp_boot:  
 
+  
+  ldax #tftp_dir_filemask
+  
+@get_tftp_directory_listing:  
+  stax nb65_param_buffer+NB65_TFTP_FILENAME
+
+  
   ldax #tftp_dir_buffer
   stax nb65_param_buffer+NB65_TFTP_POINTER
 
   ldax #getting_dir_listing_msg
 	jsr print
 
-  ldax #tftp_dir_filemask
-  stax nb65_param_buffer+NB65_TFTP_FILENAME
-
   ldax  #nb65_param_buffer
   nb65call #NB65_TFTP_DOWNLOAD
-  
+
 	bcs @dir_failed
 
   lda tftp_dir_buffer ;get the first byte that was downloaded
@@ -408,6 +414,33 @@ cmp #KEYCODE_F7
   bcc @tftp_filename_set
   jmp main_menu
 @tftp_filename_set:
+  stax  copy_dest
+  stax  get_value_of_axy+1
+  ldy #0
+  jsr get_value_of_axy ;A now == first char in string we just downloaded
+  cmp #'$'
+  bne @not_directory_name
+  ;it's a directory name, so we need to append the file mask to end of it
+  ;this will fail if the file path is more than 255 characters long
+@look_for_trailing_zero:
+   iny
+    inc copy_dest
+    bne :+
+    inc copy_dest+1
+: 
+   jsr get_value_of_axy ;A now == next char in string we just downloaded
+   bne  @look_for_trailing_zero
+   
+; got trailing zero
+  ldax  #tftp_dir_filemask+1 ;skip the leading '$'
+  stax  copy_src
+  ldax  #$07
+  jsr copymem   
+  ldax get_value_of_axy+1
+  jmp @get_tftp_directory_listing
+
+@not_directory_name:
+  ldax  get_value_of_axy+1
   jsr download
   bcc @file_downloaded_ok
 @tftp_boot_failed:  
@@ -567,7 +600,7 @@ new:
 .byte"NEW ",0
   
 tftp_dir_filemask:  
-  .asciiz "$*.prg"
+  .asciiz "$/*.prg"
 
 tftp_file:  
   .asciiz "BOOTC64.PRG"
diff --git a/client/nb65/set_ip_config.rb b/client/nb65/set_ip_config.rb
index fdd45d5..730a686 100644
--- a/client/nb65/set_ip_config.rb
+++ b/client/nb65/set_ip_config.rb
@@ -20,6 +20,7 @@
  @progname=File.basename($0)
  def show_options
    puts  "valid options are: #{@cartridge_offsets.keys.join(", ")}"
+   puts "mac auto will automagically generate a pseudorandom MAC"
 end
  def usage 
   puts "#{@progname} <image> <option> <value> [<option> <value> ..]"
diff --git a/server/lib/tftp_server.rb b/server/lib/tftp_server.rb
index 354cb37..8f8576f 100644
--- a/server/lib/tftp_server.rb
+++ b/server/lib/tftp_server.rb
@@ -8,6 +8,7 @@
 # TFTP spec : http://www.ietf.org/rfc/rfc1350.txt
 
 require 'socket'
+require 'file_list'
 class Netboot65TFTPServer
 
 
@@ -33,7 +34,7 @@ class Netboot65TFTPServer
   
   attr_reader :bootfile_dir,:port,:server_thread
   def initialize(bootfile_dir,port=69)
-    @bootfile_dir=bootfile_dir
+    @file_list=FileList.new(bootfile_dir)
     @port=port
     @server_thread=nil
     @current_connection={}    
@@ -165,27 +166,16 @@ class Netboot65TFTPServer
            opcode,filename_and_mode=data.unpack("nA*")
            filename,mode=filename_and_mode.split(0.chr)
            log_msg "RRQ for #{filename} (#{mode})"
-           if filename=~/^\./ || filename=~/\.\./ then #looks like something dodgy - either a dotfile or a directory traversal attempt
-            send_error(client_ip,client_port,1,"'#{filename}' invalid filename") 
-           elsif  filename=~/^\$(.*)/ then #it's a directory request
-              filemask="/#{$1}"
-              filemask="#{filemask}/*.*" unless filemask=~/\*/
-              log_msg "DIR for #{filemask}"  
-              data_to_send=""
-              Dir.glob("#{bootfile_dir}#{filemask}").each do |full_filename|
-                filename=full_filename.sub(/^#{bootfile_dir}\/*/,'')  
-                data_to_send<<"#{filename}\000"
+           if filename=~/^\./ || filename=~/\.\./  #looks like something dodgy - either a dotfile or a directory traversal attempt
+            send_error(client_ip,client_port,1,"'#{filename}' invalid filename")            
+            else
+              begin
+               data_to_send=@file_list[filename]
+               Thread.new {send_data(client_ip,client_port,filename,data_to_send)}
+              rescue Exception=>e
+                send_error(client_ip,client_port,1,"error retrieving '#{filename}':#{e.to_s}")
+                log_msg(e.backtrace.join("\n"))
               end
-              data_to_send<<0.chr
-              Thread.new {send_data(client_ip,client_port,"DIR of #{filemask}",data_to_send)}
-            else
-             full_filename="#{bootfile_dir}/#{filename}"
-             if File.file?(full_filename) then
-               data_to_send=File.open(full_filename,"rb").read
-               Thread.new {send_data(client_ip,client_port,full_filename,data_to_send)}
-            else
-              send_error(client_ip,client_port,1,"'#{filename}' not found") 
-            end
           end
           when 2 : #WRITE REQUEST
            opcode,filename_and_mode=data.unpack("nA*")