more sane directory name, updated binaries

src/kernal/screen/e9ff.screen_clear_line.s

@@ -0,0 +1,38 @@
+// #LAYOUT# STD *        #TAKE
+// #LAYOUT# X16 *        #IGNORE
+// #LAYOUT# *   KERNAL_0 #TAKE
+// #LAYOUT# *   *        #IGNORE
+
+//
+// Well-known routine, described in:
+//
+// - [CM64] Computes Mapping the Commodore 64 - page 219
+// - http://sta.c64.org/cbm64scrfunc.html
+//
+// input: .X - screen line to clear
+//
+// Checked that original routine preserves X (convenient for loops),
+// and leaves space screen code in .A, so duplicate this behaviour
+//
+
+
+screen_clear_line:
+
+	// First, calculate PNT and USER
+	phx_trash_a
+	jsr screen_calculate_PNT_USER_from_X
+	plx_trash_a
+
+	// Now clear the line
+	ldy #39
+!:
+	lda COLOR
+	sta (USER), y
+	lda #$20                           // space character screen code
+	sta (PNT), y
+
+	dey
+	bpl !-
+
+	// Done
+	rts