more work on monitor integration

src/mon_m65/mon_helper_memory.s

@@ -0,0 +1,78 @@
+
+; Monitor helper code - read and write
+
+; XXX there is a bug somewhere with wrapping arounf $FFFF
+
+Get_From_Memory:
+
+	phx
+	phy
+	phz
+
+	; Copy PC + .Z to TMP, set .Z to 0
+
+	clc
+	tza
+	adc Long_PC+0
+	sta Long_TMP+0
+
+	ldx #$02
+@1:
+	lda Long_PC+1,x
+	adc #$00
+	sta Long_TMP+1,x
+	dex
+	bpl @1 
+
+	ldz #$00
+
+	; Check addressing mode
+
+	bbs7 Adr_Mode, @mode_flat
+
+@mode_64k:
+
+	lda Long_TMP+1
+	bne @read                          ; branch if no need to handle shadow memory (not zero page)
+	lda Long_TMP+0
+	dec
+	dec
+	cmp #$8E
+	bcs @read                          ; branch if no need to handle shadow memory (0, 1, or above $8F)
+@2:
+	sta Long_TMP+0
+	bra @read_shadow
+
+@mode_flat:
+
+	lda Long_TMP+3
+	ora Long_TMP+2
+	ora Long_TMP+1
+	bne @read_flat
+
+	lda Long_TMP+0
+	dec
+	dec
+	cmp #$8E
+	bcs @read_flat
+	bra @2
+
+@read_shadow:
+
+	lda #MEMCONF_SHADOW_BZP_1
+	sta Long_TMP+1
+	lda #MEMCONF_SHADOW_BZP_2
+	sta Long_TMP+2
+	lda #MEMCONF_SHADOW_BZP_3
+	sta Long_TMP+3
+
+@read_flat:
+	+nop
+@read: 
+	lda  (Long_TMP),Z
+
+	plz
+	ply
+	plx
+
+	rts