'printf' routine is now optional

CONFIG.md

@@ -94,8 +94,14 @@ On the most widespread CPUs the D flag is not cleared upon entering interrupts.
 
 Feature needs 2 bytes in KERNAL segmment (for CPUs needing the patch), but at the same time allows optimizations allowing to gain some more bytes. If unsure - enable.
 
+## Debug options
+
+Options in this section are for debug purposes only. If unsure - disable.
+
 ### `CONFIG_DBG_STUBS_BRK`
 
-Option just for debugging purposes - replaces `RTS` stubbed routines implementation with one causing a break.
+Replaces `RTS` stubbed routines implementation with one causing a break.
 
-If unsure - disable.
+### `CONFIG_DBG_PRINTF`
+
+Makes 'printf' routine available.

c64/,,config_generic.s

@@ -24,4 +24,4 @@
 #define CONFIG_BCD_SAFE_INTERRUPTS
 
 // #define CONFIG_DBG_STUBS_BRK
-#define CONFIG_DBG_PRINTF
+// #define CONFIG_DBG_PRINTF

c64/,,config_mega65.s

@@ -24,4 +24,4 @@
 #define CONFIG_BCD_SAFE_INTERRUPTS
 
 // #define CONFIG_DBG_STUBS_BRK
-#define CONFIG_DBG_PRINTF
+// #define CONFIG_DBG_PRINTF

c64/,,config_ultimate64.s

@@ -24,4 +24,4 @@
 #define CONFIG_BCD_SAFE_INTERRUPTS
 
 // #define CONFIG_DBG_STUBS_BRK
-#define CONFIG_DBG_PRINTF
+// #define CONFIG_DBG_PRINTF

c64/kernal/assets/kernal_messages.s

@@ -0,0 +1,44 @@
+
+//
+// Messages to be prined out by Kernal
+//
+
+// Double underscore prevents labels from being passed to VICE (would confuse monitor)
+
+.label __MSG_KERNAL_SEARCHING_FOR = __kernal_message_searching_for - __kernal_messages_start
+.label __MSG_KERNAL_LOADING       = __kernal_message_loading       - __kernal_messages_start
+.label __MSG_KERNAL_VERIFYING     = __kernal_message_verifying     - __kernal_messages_start
+.label __MSG_KERNAL_SAVING        = __kernal_message_saving        - __kernal_messages_start
+.label __MSG_KERNAL_FROM_HEX      = __kernal_message_from_hex      - __kernal_messages_start
+.label __MSG_KERNAL_TO_HEX        = __kernal_message_to_hex        - __kernal_messages_start
+
+
+__kernal_messages_start:
+
+__kernal_message_searching_for:
+	.byte $0D
+	.text "SEARCHING FOR "
+	.byte 0
+
+__kernal_message_loading:
+	.byte $0D
+	.text "LOADING"
+	.byte 0
+
+__kernal_message_verifying:
+	.byte $0D
+	.text "VERIFYING"
+	.byte 0
+
+__kernal_message_saving:
+	.byte $0D
+	.text "SAVING"
+	.byte 0
+
+__kernal_message_from_hex:
+	.text " FROM $"
+	.byte 0
+
+__kernal_message_to_hex:
+	.text " TO $"
+	.byte 0

c64/kernal/lvs_helpers.s

@@ -71,10 +71,10 @@ lvs_advance_pointer:
 lvs_display_searching_for:
 	lda MSGFLG
 	bpl lvs_display_end
-	jsr printf // XXX don't use printf, use packed message
-	.byte $0D
-	.text "SEARCHING FOR "
-	.byte 0
+
+	ldx #__MSG_KERNAL_SEARCHING_FOR
+	jsr print_kernal_message
+
 	ldy #$00
 !:
 	cpy FNLEN
@@ -98,24 +98,21 @@ lvs_display_loading_verifying:
 	// Display LOADING / VERIFYING and start address
 	lda MSGFLG
 	bpl lvs_display_end
+
+	ldx #__MSG_KERNAL_LOADING
 	lda VERCKK
 	beq !+
-	jsr printf // XXX don't use printf, use packed message
-	.byte $0D
-	.text "VERIFYING"
-	.byte 0
-	jmp lvs_display_start_addr
+	ldx #__MSG_KERNAL_VERIFYING
 !:
-	jsr printf // XXX don't use printf, use packed message
-	.byte $0D
-	.text "LOADING"
-	.byte 0
+	jsr print_kernal_message
+
 	// FALLTHROUGH
 
 lvs_display_start_addr:
-	jsr printf // XXX don't use printf, use packed message
-	.text " FROM $"
-	.byte 0
+	ldx #__MSG_KERNAL_FROM_HEX
+!:
+	jsr print_kernal_message
+
 	lda STAL+1
 	jsr print_hex_byte
 	lda STAL+0
@@ -125,13 +122,9 @@ lvs_display_done:
 	// Display end address
 	lda MSGFLG
 	bpl lvs_display_end
-	jsr printf // XXX don't use printf, use packed message
-	.text " TO $"
-	.byte 0
-	lda STAL+1
-	jsr print_hex_byte
-	lda STAL+0
-	jsr print_hex_byte
+
+	ldx #__MSG_KERNAL_TO_HEX
+	jsr !-
 	jmp print_return
 
 lvs_wrap_around_error:

c64/kernal/print/print_kernal_message.s

@@ -0,0 +1,14 @@
+
+//
+// Print one of the standard Kernal messages, index in .X
+//
+
+!:
+	jsr JCHROUT
+	inx
+
+print_kernal_message:
+
+	lda __kernal_messages_start, x
+	bne !- // 0 marks end of string
+	rts