diff --git a/lib/program.js b/lib/program.js
index d7fd015..5121e80 100644
--- a/lib/program.js
+++ b/lib/program.js
@@ -1346,9 +1346,6 @@ Program.prototype.charset = function(val, level) {
   // enter_pc_charset_mode / smpch / S2
   // exit_pc_charset_mode / rmpch / S3
 
-  // tput: TODO
-  // if (this.tput) return this.put('s' + level, val);
-
   switch (level) {
     case 0:
       level = '(';
@@ -1364,54 +1361,59 @@ Program.prototype.charset = function(val, level) {
       break;
   }
 
-  switch (val) {
-    case 'SCLD': // DEC Special Character and Line Drawing Set.
+  var name = typeof val === 'string'
+    ? val.toLowerCase()
+    : val;
+
+  switch (name) {
+    case 'acs':
+    case 'scld': // DEC Special Character and Line Drawing Set.
       if (this.tput) return this.put.smacs();
       val = '0';
       break;
-    case 'UK': // UK
+    case 'uk': // UK
       val = 'A';
       break;
-    case 'US': // United States (USASCII).
-    case 'USASCII':
-    case 'ASCII':
+    case 'us': // United States (USASCII).
+    case 'usascii':
+    case 'ascii':
       if (this.tput) return this.put.rmacs();
       val = 'B';
       break;
-    case 'Dutch': // Dutch
+    case 'dutch': // Dutch
       val = '4';
       break;
-    case 'Finnish': // Finnish
+    case 'finnish': // Finnish
       val = 'C';
       val = '5';
       break;
-    case 'French': // French
+    case 'french': // French
       val = 'R';
       break;
-    case 'FrenchCanadian': // FrenchCanadian
+    case 'frenchcanadian': // FrenchCanadian
       val = 'Q';
       break;
-    case 'German':  // German
+    case 'german':  // German
       val = 'K';
       break;
-    case 'Italian': // Italian
+    case 'italian': // Italian
       val = 'Y';
       break;
-    case 'NorwegianDanish': // NorwegianDanish
+    case 'norwegiandanish': // NorwegianDanish
       val = 'E';
       val = '6';
       break;
-    case 'Spanish': // Spanish
+    case 'spanish': // Spanish
       val = 'Z';
       break;
-    case 'Swedish': // Swedish
+    case 'swedish': // Swedish
       val = 'H';
       val = '7';
       break;
-    case 'Swiss': // Swiss
+    case 'swiss': // Swiss
       val = '=';
       break;
-    case 'ISOLatin': // ISOLatin (actually /A)
+    case 'isolatin': // ISOLatin (actually /A)
       val = '/A';
       break;
     default: // Default
@@ -1426,13 +1428,13 @@ Program.prototype.charset = function(val, level) {
 Program.prototype.enter_alt_charset_mode =
 Program.prototype.as =
 Program.prototype.smacs = function() {
-  return this.charset('SCLD');
+  return this.charset('acs');
 };
 
 Program.prototype.exit_alt_charset_mode =
 Program.prototype.ae =
 Program.prototype.rmacs = function() {
-  return this.charset('US');
+  return this.charset('ascii');
 };
 
 // ESC N
@@ -1452,8 +1454,6 @@ Program.prototype.rmacs = function() {
 // ESC ~
 // Invoke the G1 Character Set as GR (LS1R).
 Program.prototype.setG = function(val) {
-  // tput: TODO
-  // if (this.tput) return this.put('s' + val);
   // if (this.tput) return this.put.S2();
   // if (this.tput) return this.put.S3();
   switch (val) {
@@ -1500,7 +1500,7 @@ Program.prototype.setTitle = function(title) {
 // OSC Ps ; Pt BEL
 //   Reset colors
 Program.prototype.resetColors = function(param) {
-  if (this.tput.has('Cr')) {
+  if (this.has('Cr')) {
     return this.put.Cr(param);
   }
   return this.osc('112;' + param + '\x07');