more sane directory name, updated binaries

src/basic/peek_line_pointer_null_check.s

@@ -0,0 +1,44 @@
+// #LAYOUT# STD *       #TAKE
+// #LAYOUT# *   BASIC_0 #TAKE
+// #LAYOUT# *   *       #IGNORE
+
+// Return C=1 if a pointer in BASIC memory space is NULL, else C=0
+// X = ZP pointer to check
+
+peek_line_pointer_null_check:
+
+	ldy #$00
+
+#if CONFIG_MEMORY_MODEL_60K
+	ldx #<OLDTXT+0
+	jsr peek_under_roms
+	cmp #$00
+#elif CONFIG_MEMORY_MODEL_46K || CONFIG_MEMORY_MODEL_50K
+	jsr peek_under_roms_via_OLDTXT
+	cmp #$00
+#else // CONFIG_MEMORY_MODEL_38K
+	lda (OLDTXT),y
+#endif
+
+	bne ptr_not_null
+	iny
+
+#if CONFIG_MEMORY_MODEL_60K
+	jsr peek_under_roms
+	cmp #$00
+#elif CONFIG_MEMORY_MODEL_46K || CONFIG_MEMORY_MODEL_50K
+	jsr peek_under_roms_via_OLDTXT
+	cmp #$00
+#else // CONFIG_MEMORY_MODEL_38K
+	lda (OLDTXT),y
+#endif
+
+	bne ptr_not_null
+
+	// Pointer is NULL
+	clc
+	rts
+
+ptr_not_null:
+	sec
+	rts