diff --git a/runtime/syntax/plm.vim b/runtime/syntax/plm.vim
new file mode 100644
index 0000000..bf7c32f
--- /dev/null
+++ b/runtime/syntax/plm.vim
@@ -0,0 +1,147 @@
+" Vim syntax file
+" Language:	PL/M
+" Maintainer:	Philippe Coulonges <cphil@cphil.net>
+" Last change:	2003 May 11
+
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+  syntax clear
+elseif exists("b:current_syntax")
+  finish
+endif
+
+" PL/M is a case insensitive language
+syn case ignore
+
+syn keyword plmTodo contained	TODO FIXME XXX
+
+" String
+syn region  plmString		start=+'+  end=+'+
+
+syn match   plmOperator		"[@=\+\-\*\/\<\>]"
+
+syn match   plmIdentifier	"\<[a-zA-Z_][a-zA-Z0-9_]*\>"
+
+syn match   plmDelimiter	"[();,]"
+
+syn region  plmPreProc		start="^\s*\$\s*" skip="\\$" end="$"
+
+" FIXME : No Number support for floats, as I'm working on an embedded
+" project that doesn't use any.
+syn match   plmNumber		"-\=\<\d\+\>"
+syn match   plmNumber		"\<[0-9a-fA-F]*[hH]*\>"
+
+" If you don't like tabs
+"syn match plmShowTab "\t"
+"syn match plmShowTabc "\t"
+
+"when wanted, highlight trailing white space
+if exists("c_space_errors")
+  syn match	plmSpaceError	"\s*$"
+  syn match	plmSpaceError	" \+\t"me=e-1
+endif
+
+"
+  " Use the same control variable as C language for I believe
+  " users will want the same behavior
+if exists("c_comment_strings")
+  " FIXME : don't work fine with c_comment_strings set,
+  "	    which I don't care as I don't use
+
+  " A comment can contain plmString, plmCharacter and plmNumber.
+  " But a "*/" inside a plmString in a plmComment DOES end the comment!  So we
+  " need to use a special type of plmString: plmCommentString, which also ends on
+  " "*/", and sees a "*" at the start of the line as comment again.
+  syntax match	plmCommentSkip	contained "^\s*\*\($\|\s\+\)"
+  syntax region plmCommentString	contained start=+"+ skip=+\\\\\|\\"+ end=+"+ end=+\*/+me=s-1 contains=plmSpecial,plmCommentSkip
+  syntax region plmComment2String	contained start=+"+ skip=+\\\\\|\\"+ end=+"+ end="$" contains=plmSpecial
+  syntax region plmComment	start="/\*" end="\*/" contains=plmTodo,plmCommentString,plmCharacter,plmNumber,plmFloat,plmSpaceError
+  syntax match  plmComment	"//.*" contains=plmTodo,plmComment2String,plmCharacter,plmNumber,plmSpaceError
+else
+  syn region	plmComment	start="/\*" end="\*/" contains=plmTodo,plmSpaceError
+  syn match	plmComment	"//.*" contains=plmTodo,plmSpaceError
+endif
+
+syntax match	plmCommentError	"\*/"
+
+syn keyword plmReserved	ADDRESS AND AT BASED BY BYTE CALL CASE
+syn keyword plmReserved DATA DECLARE DISABLE DO DWORD
+syn keyword plmReserved	ELSE ENABLE END EOF EXTERNAL
+syn keyword plmReserved GO GOTO HALT IF INITIAL INTEGER INTERRUPT
+syn keyword plmReserved LABEL LITERALLY MINUS MOD NOT OR
+syn keyword plmReserved PLUS POINTER PROCEDURE PUBLIC
+syn keyword plmReserved REAL REENTRANT RETURN SELECTOR STRUCTURE
+syn keyword plmReserved THEN TO WHILE WORD XOR
+syn keyword plm386Reserved CHARINT HWORD LONGINT OFFSET QWORD SHORTINT
+
+syn keyword plmBuiltIn ABS ADJUSTRPL BLOCKINPUT BLOCKINWORD BLOCKOUTPUT
+syn keyword plmBuiltIn BLOCKOUTWORD BUILPTR CARRY CAUSEINTERRUPT CMPB
+syn keyword plmBuiltIn CMPW DEC DOUBLE FINDB FINDRB FINDRW FINDW FIX
+syn keyword plmBuiltIn FLAGS FLOAT GETREALERROR HIGH IABS INITREALMATHUNIT
+syn keyword plmBuiltIn INPUT INT INWORD LAST LOCKSET LENGTH LOW MOVB MOVE
+syn keyword plmBuiltIn MOVRB MOVRW MOVW NIL OUTPUT OUTWORD RESTOREREALSTATUS
+syn keyword plmBuiltIn ROL ROR SAL SAVEREALSTATUS SCL SCR SELECTOROF SETB
+syn keyword plmBuiltIn SETREALMODE SETW SHL SHR SIGN SIGNED SIZE SKIPB
+syn keyword plmBuiltIn SKIPRB SKIPRW SKIPW STACKBASE STACKPTR TIME SIZE
+syn keyword plmBuiltIn UNSIGN XLAT ZERO
+syn keyword plm386BuiltIn INTERRUPT SETINTERRUPT
+syn keyword plm286BuiltIn CLEARTASKSWITCHEDFLAG GETACCESSRIGHTS
+syn keyword plm286BuiltIn GETSEGMENTLIMIT LOCALTABLE MACHINESTATUS
+syn keyword plm286BuiltIn OFFSETOF PARITY RESTOREGLOBALTABLE
+syn keyword plm286BuiltIn RESTOREINTERRUPTTABLE SAVEGLOBALTABLE
+syn keyword plm286BuiltIn SAVEINTERRUPTTABLE SEGMENTREADABLE
+syn keyword plm286BuiltIn SEGMENTWRITABLE TASKREGISTER WAITFORINTERRUPT
+syn keyword plm386BuiltIn CONTROLREGISTER DEBUGREGISTER FINDHW
+syn keyword plm386BuiltIn FINDRHW INHWORD MOVBIT MOVRBIT MOVHW MOVRHW
+syn keyword plm386BuiltIn OUTHWORD SCANBIT SCANRBIT SETHW SHLD SHRD
+syn keyword plm386BuiltIn SKIPHW SKIPRHW TESTREGISTER
+syn keyword plm386w16BuiltIn BLOCKINDWORD BLOCKOUTDWORD CMPD FINDD
+syn keyword plm386w16BuiltIn FINDRD INDWORD MOVD MOVRD OUTDWORD
+syn keyword plm386w16BuiltIn SETD SKIPD SKIPRD
+
+syn sync lines=50
+
+" Define the default highlighting.
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_plm_syntax_inits")
+  if version < 508
+    let did_plm_syntax_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
+
+ " The default methods for highlighting.  Can be overridden later
+"  HiLink plmLabel			Label
+"  HiLink plmConditional		Conditional
+"  HiLink plmRepeat			Repeat
+  HiLink plmTodo			Todo
+  HiLink plmNumber			Number
+  HiLink plmOperator			Operator
+  HiLink plmDelimiter			Operator
+  "HiLink plmShowTab			Error
+  "HiLink plmShowTabc			Error
+  HiLink plmIdentifier			Identifier
+  HiLink plmBuiltIn			Statement
+  HiLink plm286BuiltIn			Statement
+  HiLink plm386BuiltIn			Statement
+  HiLink plm386w16BuiltIn		Statement
+  HiLink plmReserved			Statement
+  HiLink plm386Reserved			Statement
+  HiLink plmPreProc			PreProc
+  HiLink plmCommentError		plmError
+  HiLink plmCommentString		plmString
+  HiLink plmComment2String		plmString
+  HiLink plmCommentSkip			plmComment
+  HiLink plmString			String
+  HiLink plmComment			Comment
+
+  delcommand HiLink
+endif
+
+let b:current_syntax = "plm"
+
+" vim: ts=8 sw=2
+