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diff --git a/runtime/syntax/asmh8300.vim b/runtime/syntax/asmh8300.vim
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+" Vim syntax file
+" Language:		Hitachi H-8300h specific syntax for GNU Assembler
+" Maintainer:		Doug Kearns <dougkearns@gmail.com>
+" Previous Maintainer:	Kevin Dahlhausen <kdahlhaus@yahoo.com>
+" Last Change:		2020 Oct 31
+
+if exists("b:current_syntax")
+  finish
+endif
+
+runtime! syntax/asm.vim
+
+syn case ignore
+
+syn match asmDirective	"\.h8300[hs]n\="
+
+"h8300[h] registers
+syn match asmRegister	"e\=r\o[lh]\="
+
+"h8300[h] opcodes - order is important!
+syn match asmOpcode "add\.[lbw]"
+syn match asmOpcode "add[sx :]"
+syn match asmOpcode "and\.[lbw]"
+syn match asmOpcode "bl[deots]"
+syn match asmOpcode "cmp\.[lbw]"
+syn match asmOpcode "dec\.[lbw]"
+syn match asmOpcode "divx[us].[bw]"
+syn match asmOpcode "ext[su]\.[lw]"
+syn match asmOpcode "inc\.[lw]"
+syn match asmOpcode "mov\.[lbw]"
+syn match asmOpcode "mulx[su]\.[bw]"
+syn match asmOpcode "neg\.[lbw]"
+syn match asmOpcode "not\.[lbw]"
+syn match asmOpcode "or\.[lbw]"
+syn match asmOpcode "pop\.[wl]"
+syn match asmOpcode "push\.[wl]"
+syn match asmOpcode "rotx\=[lr]\.[lbw]"
+syn match asmOpcode "sha[lr]\.[lbw]"
+syn match asmOpcode "shl[lr]\.[lbw]"
+syn match asmOpcode "sub\.[lbw]"
+syn match asmOpcode "xor\.[lbw]"
+
+syn keyword asmOpcode andc band bcc bclr bcs beq bf bge bgt
+syn keyword asmOpcode bhi bhs biand bild bior bist bixor bmi
+syn keyword asmOpcode bne bnot bnp bor bpl bpt bra brn bset
+syn keyword asmOpcode bsr btst bst bt bvc bvs bxor cmp daa
+syn keyword asmOpcode das eepmov eepmovw inc jmp jsr ldc movfpe
+syn keyword asmOpcode movtpe mov nop orc rte rts sleep stc
+syn keyword asmOpcode sub trapa xorc
+
+syn case match
+
+hi def link asmOpcode	Statement
+hi def link asmRegister	Identifier
+
+let b:current_syntax = "asmh8300"
+
+" vim: nowrap sw=2 sts=2 ts=8 noet