diff --git a/pygbag/aio.py b/pygbag/aio.py
index fd8f050..c2e899b 100644
--- a/pygbag/aio.py
+++ b/pygbag/aio.py
@@ -78,3 +78,4 @@
         else:
             time.sleep(dt)
     print("sim loop exited")
+    sys.stdout.flush()
diff --git a/pygbag/support/cross/aio/__init__.py b/pygbag/support/cross/aio/__init__.py
index 896ecfc..d708ea8 100644
--- a/pygbag/support/cross/aio/__init__.py
+++ b/pygbag/support/cross/aio/__init__.py
@@ -148,6 +148,7 @@ def overloaded(i, *attrs):
 leave = enter + spent
 
 from asyncio import *
+from asyncio import exceptions
 
 __run__ = run
 
diff --git a/static/pythons.js b/static/pythons.js
index 6cb0051..da1119c 100644
--- a/static/pythons.js
+++ b/static/pythons.js
@@ -1012,15 +1012,12 @@ async function feat_vtx(debug_hidden) {
     const { WasmTerminal } = await import("./vtx.js")
     const lines = get_terminal_lines() // including virtual get_terminal_console()
     const py = window.document.body.clientHeight
-    var fntsize = Math.floor(py/lines) - 7
+    var fntsize = Math.floor(py/lines) - 2
 
-//    if (lines<45)
-  //      fntsize -= 3
+    // why ????????
+    if (fntsize>32) fntsize--
+    if (fntsize>20) fntsize--
 
-    if (py>720)
-        fntsize += 1
-    if (py>1024)
-        fntsize += 1
     console.warn("fnt:",window.document.body.clientHeight ,"/", lines,"=", fntsize)
     vm.vt = new WasmTerminal(
         "terminal",
diff --git a/static/vtx.js b/static/vtx.js
index 8d89382..9f87d36 100644
--- a/static/vtx.js
+++ b/static/vtx.js
@@ -48,43 +48,36 @@ export class WasmTerminal {
         this.inputStartCursor = null
 
         this.nodup = 1
-        var theme = { background: '#1a1c1f' }
+        var theme = {
+            background: '#1a1c1f'
+        }
+
+
         var transparency = false
+        var sback = 1000
 
         if (is_fbdev) {
             theme = {
                 foreground: '#ffffff',
-                background: 'rgba(0, 0, 0, 0)',
-                cursor: '#ffffff',
-                selection: 'rgba(255, 255, 255, 0.3)',
-                black: '#000000',
-                red: '#e06c75',
-                brightRed: '#e06c75',
-                green: '#A4EFA1',
-                brightGreen: '#A4EFA1',
-                brightYellow: '#EDDC96',
-                yellow: '#EDDC96',
-                magenta: '#e39ef7',
-                brightMagenta: '#e39ef7',
-                cyan: '#5fcbd8',
-                brightBlue: '#5fcbd8',
-                brightCyan: '#5fcbd8',
-                blue: '#5fcbd8',
-                white: '#d0d0d0',
-                brightBlack: '#808080',
-                brightWhite: '#ffffff'
+                background: 'rgba(0, 0, 0, 0)'
             }
+            sback = 0
             transparency = true
         }
 
         this.xterm = new Terminal(
             {
+//              rendererType : "dom",
+                rendererType : "webgl",
+                experimentalCharAtlas : "webgl",
                 theme: theme,
                 allowTransparency: transparency,
                 allowProposedApi : true ,   // xterm 0.5 + sixel
-                scrollback: 0,
+                scrollback: sback,
+                fontFamily: 'Courier-new, courier, monospace',
                 fontSize: (fontsize || 12),
-                cols: (cols || 132), rows: (rows || 32)
+                cols: (cols || 132),
+                rows: (rows || 32)
             }
         );