more work on new memory models

c64/basic/basic_find_next_line.s

@@ -12,6 +12,8 @@ basic_find_next_line:
 #if CONFIG_MEMORY_MODEL_60K
 	ldx #<OLDTXT+0
 	jsr peek_under_roms
+#elif CONFIG_MEMORY_MODEL_46K || CONFIG_MEMORY_MODEL_50K
+	jsr peek_under_roms_via_OLDTXT
 #else // CONFIG_MEMORY_MODEL_38K
 	lda (OLDTXT),y
 #endif
@@ -21,6 +23,8 @@ basic_find_next_line:
 
 #if CONFIG_MEMORY_MODEL_60K
 	jsr peek_under_roms
+#elif CONFIG_MEMORY_MODEL_46K || CONFIG_MEMORY_MODEL_50K
+	jsr peek_under_roms_via_OLDTXT
 #else // CONFIG_MEMORY_MODEL_38K
 	lda (OLDTXT),y
 #endif