added ram disk status message on startup screen

src/dos_m65/unit_ramdisk/unit_rd_init.s

@@ -37,6 +37,8 @@ unit_rd_init_test_ram:                 ; non-destructive ATTIC/CELLAR RAM test
 	dex
 	bpl @2
 
+	stx RD_MSG                         ; $FF - mark no message to be displayed
+
 	; For the start, mark extended RAM as not present
 
 	stx RD_STARTSEG                    ; by default $FF, to mark no RAM disk

src/dos_m65/unit_ramdisk/unit_rd_preload.s

@@ -12,7 +12,7 @@ unit_rd_preload:
 	; Check if RAM disk is enabled (should be disabled if no Hyper RAM is present)
 
 	lda UNIT_RAMDISK
-	+beq @error_no_ramdisk
+	+beq unit_rd_preload_err_common_noclose
 
 	; Select SD card buffer
 
@@ -139,6 +139,9 @@ unit_rd_preload:
 	lda #$00                           ; temporary storage needs to be restored to 0
 	sta __stoptrack
 
+	lda #$00                           ; set message to OK
+	sta RD_MSG
+
 	rts
 
 
@@ -149,40 +152,26 @@ unit_rd_preload:
 
 @error_wrong_size:
 
-	jsr unit_rd_preload_err_common
-
-	; XXX set error information
-
-	rts
+	lda #$01
+	jmp unit_rd_preload_err_common
 
 @error_too_large:
 
-	jsr unit_rd_preload_err_common
-
-	; XXX set error information
-
-	rts
+	lda #$02
+	jmp unit_rd_preload_err_common
 
 @error_not_found:
 
-	jsr unit_rd_preload_err_common_noclose
-
-	; XXX set error information, put 0 to __stoptrack
-
-	rts
-
-@error_no_ramdisk:
-
-	jsr unit_rd_preload_err_common_noclose
-
-	; XXX set error information, put 0 to __stoptrack
-
-	rts
+	lda #$03
+	sta RD_MSG
 
+	jmp unit_rd_preload_err_common_noclose
 
 
 unit_rd_preload_err_common:
 
+	sta RD_MSG                         ; set code for startup screen
+
 	lda #$20                           ; dos_closefile
 	sta HTRAP00
 	+nop