Add the NOP Zero Page undocumented opcode.

This seems to be one of the preferred undocced ops in the Atari
2600 VCS development community.

src/Ophis/Opcodes.py

@@ -7,6 +7,10 @@
 # You may use, modify, and distribute this file under the MIT
 # license: See README for details.
 
+# DO NOT EDIT THIS FILE DIRECTLY.
+# This file was automatically generated by gensets.py based on the
+# the tables in tools/opcodes. Edit those tables, not these.
+
 # Names of addressing modes
 modes = ["Implied",         #  0
          "Immediate",       #  1
@@ -96,6 +100,7 @@ undocops = {
             'las': [None, None, None, None, None, None, None, 0xBB, None, None, None, None, None, None, None],
             'lax': [None, None, 0xA7, None, 0xB7, 0xAF, None, 0xBF, None, None, None, None, 0xA3, 0xB3, None],
             'lxa': [None, 0xAB, None, None, None, None, None, None, None, None, None, None, None, None, None],
+            'nop': [0xEA, None, 0x04, None, None, None, None, None, None, None, None, None, None, None, None],
             'rla': [None, None, 0x27, 0x37, None, 0x2F, 0x3F, 0x3B, None, None, None, None, 0x23, 0x33, None],
             'rra': [None, None, 0x67, 0x77, None, 0x6F, 0x7F, 0x7B, None, None, None, None, 0x63, 0x73, None],
             'sax': [None, None, 0x87, None, 0x97, 0x8F, None, None, None, None, None, None, 0x83, None, None],

tests/test6510.oph

@@ -13,6 +13,7 @@
 ; opcodes - see testbase.oph for those.
 
 	SLO	($03, X)
+	NOP	$04
 	SLO	$07
 	ANC	#$0B
 	SLO	$0F0F

tools/opcodes/gensets.py

@@ -3,31 +3,35 @@ import sys
 
 verbose = 0
 
-prologue = '"""' + """Opcodes file.
+prologue = '"""' +"""Opcodes file.
 
-	Tables for the assembly of 6502-family instructions, mapping
-	opcodes and addressing modes to binary instructions.""" + '"""' + """
+    Tables for the assembly of 6502-family instructions, mapping
+    opcodes and addressing modes to binary instructions.""" + '"""' + """
 
-# Copyright 2002 Michael C. Martin.
-# You may use, modify, and distribute this file under the BSD
-# license: See LICENSE.txt for details.
+# Copyright 2002-2012 Michael C. Martin and additional contributors.
+# You may use, modify, and distribute this file under the MIT
+# license: See README for details.
+
+# DO NOT EDIT THIS FILE DIRECTLY.
+# This file was automatically generated by gensets.py based on the
+# the tables in tools/opcodes. Edit those tables, not these.
 
 # Names of addressing modes
 modes = ["Implied",         #  0
-	 "Immediate",       #  1
-	 "Zero Page",       #  2
-	 "Zero Page, X",    #  3
-	 "Zero Page, Y",    #  4
-	 "Absolute",        #  5
-	 "Absolute, X",     #  6
-	 "Absolute, Y",     #  7
-	 "(Absolute)",      #  8
+         "Immediate",       #  1
+         "Zero Page",       #  2
+         "Zero Page, X",    #  3
+         "Zero Page, Y",    #  4
+         "Absolute",        #  5
+         "Absolute, X",     #  6
+         "Absolute, Y",     #  7
+         "(Absolute)",      #  8
          "(Absolute, X)",   #  9
          "(Absolute), Y",   # 10
          "(Zero Page)",     # 11
-	 "(Zero Page, X)",  # 12
-	 "(Zero Page), Y",  # 13
-	 "Relative"]        # 14
+         "(Zero Page, X)",  # 12
+         "(Zero Page), Y",  # 13
+         "Relative"]        # 14
 
 # Lengths of the argument
 lengths = [0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1]
@@ -35,20 +39,20 @@ lengths = [0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1]
 
 # These values should match the ones in the prologue string.
 modes = ["Implied",         #  0
-	 "Immediate",       #  1
-	 "Zero Page",       #  2
-	 "Zero Page, X",    #  3
-	 "Zero Page, Y",    #  4
-	 "Absolute",        #  5
-	 "Absolute, X",     #  6
-	 "Absolute, Y",     #  7
-	 "(Absolute)",      #  8
+         "Immediate",       #  1
+         "Zero Page",       #  2
+         "Zero Page, X",    #  3
+         "Zero Page, Y",    #  4
+         "Absolute",        #  5
+         "Absolute, X",     #  6
+         "Absolute, Y",     #  7
+         "(Absolute)",      #  8
          "(Absolute, X)",   #  9
          "(Absolute), Y",   # 10
          "(Zero Page)",     # 11
-	 "(Zero Page, X)",  # 12
-	 "(Zero Page), Y",  # 13
-	 "Relative"]        # 14
+         "(Zero Page, X)",  # 12
+         "(Zero Page), Y",  # 13
+         "Relative"]        # 14
 
 flatmodes = [x.lower() for x in modes]
 
@@ -150,4 +154,3 @@ if __name__=='__main__':
         dump_map (instruction_map, ' ' * (len(field) + 4))
         print "%s}" % (' ' * (len(field) + 3))
         print ""
-    

tools/opcodes/op6510.txt

@@ -2,7 +2,7 @@
   01: ORA - (Zero Page, X)
   02: 
   03: SLO - (Zero Page, X)
-  04: 
+  04: NOP - Zero Page 
   05: ORA - Zero Page
   06: ASL - Zero Page
   07: SLO - Zero Page