diff --git a/l65.lua b/l65.lua
index a668ac0..2e8bbe8 100644
--- a/l65.lua
+++ b/l65.lua
@@ -2462,29 +2462,25 @@ local function Format65(ast)
     return table.concat(out.rope)
 end
 
-if #arg ~= 2 then
-    print("Invalid arguments, usage:\nl65 source destination")
-    return
+local l65searcher = function(name)
+    local dirsep = package.config:sub(1,1)
+    local filename,err = package.searchpath(name, string.format(".%s?;.%s?.l65", dirsep, dirsep), '.', '.')
+    if not filename then return end
+    local file = io.open(filename, 'rb')
+    if not file then return "failed to open " .. filename .. " for reading"  end
+    local src = file:read('*all')
+    file:close()
+    local st, ast = ParseLua(src)
+    if not st then print(ast) return end
+    local bc = assert(load(Format65(ast), filename))
+    return bc, filename
 end
+table.insert(package.searchers, 2, l65searcher)
 
-local inf = io.open(arg[1], 'r')
-if not inf then
-    print("Failed to open '"..arg[1].."' for reading")
+if #arg ~= 1 then
+    print("Invalid arguments, usage:\nl65 <filename>")
     return
 end
-local outf = io.open(arg[2], 'w')
-if not outf then
-    print("Failed to open '"..arg[2].."' for writing")
-    return
-end
-
-local sourceText = inf:read('*all')
-inf:close()
-local st, ast = ParseLua(sourceText)
-if not st then
-    print(ast)
-    return
-end
-
-outf:write(Format65(ast))
-outf:close()
+local inf,dirsep = arg[1],package.config:sub(1,1)
+local fn='' for i=#inf,1,-1 do local c=inf:sub(i,i) if c==dirsep or c=='/' then break end fn=c..fn if c=='.' then fn='' end end filename=fn
+require(arg[1])
diff --git a/samples/vcs1.l65 b/samples/vcs1.l65
index 3bde92c..9e7e3b8 100644
--- a/samples/vcs1.l65
+++ b/samples/vcs1.l65
@@ -27,7 +27,6 @@ local wait = function() local l=label() lda INTIM bne l end
     lda#TIM_KERNEL sta T1024T kernel() wait()
     jmp main
 
-local filename=string.match(arg[0], ".-([^\\/]-)%.?[^%.\\/]*$")
 writebin(filename..'.bin')
 writesym(filename..'.sym')
 print(stats)
diff --git a/vcs.lua b/vcs.l65
similarity index 97%
rename from vcs.lua
rename to vcs.l65
index 218d30b..7d54074 100644
--- a/vcs.lua
+++ b/vcs.l65
@@ -84,8 +84,6 @@ do
     for k,v in pairs(vcs) do symbols[k] = v end
 end
 
---[[ TODO enable this when lua load() is changed
-
 mappers = {}
 
 mappers['2K'] = function()
@@ -178,7 +176,7 @@ mappers.F0 = function()
     end
 end
 
-local function bank_stubs2 = function(hotspot0, hotspot1)
+local bank_stubs2 = function(hotspot0, hotspot1)
     function switchrom(i)
         if i==0 then bit hotspot0
         elseif i==1 then bit hotspot1
@@ -193,11 +191,9 @@ local function bank_stubs2 = function(hotspot0, hotspot1)
     end
 end
 mappers.UA = function() bank_stubs2(0x220, 0x240) end
-mappers.['0840'] = function() bank_stubs2(0x800, 0x840) end
+mappers['0840'] = function() bank_stubs2(0x800, 0x840) end
 
 mappers['3E'] = function(rom_count, ram_count)
     mappers['3F'](rom_count)
     function switchram(i) assert(i>=0 and i<ram_count-1) lda#i sta 0x3E end
 end
-
-]]