added PRIMM implementation for easier debugging

src/kernal/jumptable_m65/ff7d.jprimm.s

@@ -0,0 +1,11 @@
+;; #LAYOUT# M65 KERNAL_0 #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+
+; 'Print immediate' - useful debug routine, present on many CBM machines
+; see https://www.pagetable.com/?p=926
+
+
+JPRIMM:
+
+	jmp PRIMM

src/kernal/print/primm.s

@@ -0,0 +1,31 @@
+;; #LAYOUT# M65 KERNAL_0 #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+
+; 'Print immediate', original implementation by Mike Barry, adapted to 65CE02
+; see http://www.6502.org/source/io/primm.htm
+
+
+PRIMM:
+
+	pla            ; get low part of (string address-1)
+	sta PTR1
+	pla            ; get high part of (string address-1)
+	sta PTR2
+	+bra @2
+@1:
+	jsr JCHROUT    ; output a string char
+@2:
+	inc PTR1       ; advance the string pointer
+	bne @3
+    inc PTR2
+@3:
+	ldy #$00
+	lda (PTR1), y  ; get string char
+	bne @1         ; output and continue if not NUL
+	lda PTR2
+	pha
+	lda PTR1
+	pha
+
+	rts