various keyboard related fixes

src/kernal/keyboard_m65/mega65_kb_matrix_bucky_shflag.s

@@ -0,0 +1,14 @@
+;; #LAYOUT# M65 KERNAL_C #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+
+
+kb_matrix_bucky_shflag: ; mask to be ORed to SHFLAG to mark key status
+
+	!byte KEY_FLAG_SHIFT
+	!byte KEY_FLAG_SHIFT
+	!byte KEY_FLAG_CTRL
+	!byte KEY_FLAG_VENDOR
+	!byte KEY_FLAG_ALT
+	!byte KEY_FLAG_NO_SCRL
+	!byte KEY_FLAG_CAPSL

src/kernal/keyboard_m65/mega65_scnkey.s

@@ -169,11 +169,11 @@ m65_scnkey_next_1:
 	; No new key - check if the last one is still pressed
 
 	ldy LSTX
-	cmp M65_KB_PRESSED+0
+	cpy M65_KB_PRESSED+0
 	beq m65_scnkey_got_key_skip_cmp
-	cmp M65_KB_PRESSED+1
+	cpy M65_KB_PRESSED+1
 	beq m65_scnkey_got_key_skip_cmp
-	cmp M65_KB_PRESSED+2
+	cpy M65_KB_PRESSED+2
 	beq m65_scnkey_got_key_skip_cmp
 
 	; Nope, previous key is not pressed
@@ -331,11 +331,11 @@ m65_scnkey_compare_with_old:
 
 	; Compare key index with the ones from previous scan
 
-	cmp M65_KB_PRESSED+0
+	cmp M65_KB_PRESSED_OLD+0
 	beq @1
-	cmp M65_KB_PRESSED+1
+	cmp M65_KB_PRESSED_OLD+1
 	beq @1
-	cmp M65_KB_PRESSED+2
+	cmp M65_KB_PRESSED_OLD+2
 @1:
 	rts