DECARM - auto repeat support. defaults to auto-repeat on.

n.b. - mame does not currently set the repeat bit in the keymod reg so it's not well tested.

vt100.key.S

@@ -30,13 +30,22 @@ keypress ent
 	debug keypress
 	lda KBD
 	bmi :key
-	rts
+:rts	rts
 :key
 	and #$7f
 	sta key
 	lda KEYMOD
 	sta mod
 	sta KEYSTROBE
+
+* if DECARM is clear, skip repeat characters.
+	bit DECARM
+	bpl :arm
+	bit #kmRepeat
+	bne :rts
+:arm
+
+
 	bit #kmOption!kmCommand
 	bne command
 

vt100.main.S

@@ -106,7 +106,8 @@ init
 	sta DECBM
 	lda #$80
 *	sta LOCAL
-	sta DECANM
+	sta DECANM ; ANSI (vt100) on
+	sta DECARM ; key repeat on
 
 *	lda #st_vt52
 	lda #st_vt100