diff --git a/src/net/torvald/terrarum/virtualcomputer/assets/lua/CCAPI.lua b/src/net/torvald/terrarum/virtualcomputer/assets/lua/CCAPI.lua
index cc7fc9b82..a42bf63e6 100644
--- a/src/net/torvald/terrarum/virtualcomputer/assets/lua/CCAPI.lua
+++ b/src/net/torvald/terrarum/virtualcomputer/assets/lua/CCAPI.lua
@@ -87,7 +87,7 @@ end
 
 
 local function normaliseCCcol(cccol)
-    if cccol >= 0x1 and cccol <= 0x8FFF then
+    if cccol >= 0x1 and cccol <= 0xFFFF then
         return intLog2(cccol)
     else
         error("invalid CC Colors: "..cccol)
@@ -110,9 +110,9 @@ local function cHexToInt(c)
         if c >= 48 and c <= 57 then
             return c - 48
         elseif c >= 65 and c <= 70 then
-            return c - 65
+            return c - 65 + 10
         elseif c >= 97 and c <= 102 then
-            return c - 97
+            return c - 97 + 10
         else
             return 0
         end
@@ -120,9 +120,9 @@ local function cHexToInt(c)
         if c:byte(1) >= 48 and c:byte(1) <= 57 then
             return c:byte(1) - 48
         elseif c:byte(1) >= 65 and c:byte(1) <= 70 then
-            return c:byte(1) - 65
+            return c:byte(1) - 65 + 10
         elseif c:byte(1) >= 97 and c:byte(1) <= 102 then
-            return c:byte(1) - 97
+            return c:byte(1) - 97 + 10
         else
             --error("unrepresentable: " .. c)
             -- return black, as defined in http://www.computercraft.info/wiki/Term.blit
@@ -144,8 +144,8 @@ term.blit = function(text, foreCol, backCol)
     end
 
     for i = 1, #text do
-        term.setForeCol(cHexToInt(foreCol:byte(i)))
-        term.setBackCol(cHexToInt(backCol:byte(i)))
+        term.setForeCol(ccToGameCol[1 + cHexToInt(foreCol:byte(i))])
+        term.setBackCol(ccToGameCol[1 + cHexToInt(backCol:byte(i))])
         term.emit(text:byte(i))
         term.moveCursor(term.getX() + 1, term.getY())
     end
diff --git a/src/net/torvald/terrarum/virtualcomputer/assets/lua/ROMBASIC.lua b/src/net/torvald/terrarum/virtualcomputer/assets/lua/ROMBASIC.lua
index effcb4e81..cf413cdc3 100644
--- a/src/net/torvald/terrarum/virtualcomputer/assets/lua/ROMBASIC.lua
+++ b/src/net/torvald/terrarum/virtualcomputer/assets/lua/ROMBASIC.lua
@@ -16,7 +16,7 @@ _COMPUTER.DC2 = string.char(18) -- white
 _COMPUTER.DC3 = string.char(19) -- dim grey
 _COMPUTER.DC4 = string.char(20) -- light grey
 _COMPUTER.prompt = function()
-    io.write(_COMPUTER.DC3 .. "> " .. _COMPUTER.DC4)
+    io.write(_COMPUTER.DC3.."> ".._COMPUTER.DC4)
 end
 _COMPUTER.verbose = true -- print debug info
 _COMPUTER.loadedCLayer = {} -- list of loaded compatibility layers
@@ -28,12 +28,14 @@ require("ROMLIB")
 
 -- load bios, if any
 if fs.exists(_COMPUTER.bootloader) then shell.run(_COMPUTER.bootloader) end
+-- halt/run luaprompt upon the termination of bios.
+-- Valid BIOS should load OS and modify 'shell.status' to 'shell.halt' before terminated.
 if shell.status == shell.halt then
     __haltsystemexplicit__()
 else
     -- load Lua prompt, if bios is not found
     if (#_COMPUTER.OEM > 0) then print(_COMPUTER.OEM) end
-    print("Rom basic " .. _COMPUTER.DC2 .. _VERSION .. _COMPUTER.DC4)
-    -- print(_COMPUTER.DC2 .. freemem .. _COMPUTER.DC4 .. " bytes free"
+    print("Rom basic ".._COMPUTER.DC2.._VERSION.._COMPUTER.DC4)
+    -- print(_COMPUTER.DC2..freemem.._COMPUTER.DC4.." bytes free"
     print("Ok")
 end