Simple initial example using command line development

.gitignore

@@ -1,2 +1,6 @@
 /build/
 /.cache/
+*.lst
+*.xex
+dap.log
+65816

cli/minimal/Makefile

@@ -0,0 +1,31 @@
+# **************************************************************************************
+#
+#									Very minimal makefile.
+#
+# **************************************************************************************
+
+#
+#		Path / Name of emulator.
+#
+EMULATOR = emu_linux_x64
+#
+#		64tass optios.
+#
+ASMOPTS = -b -w -x
+
+#
+#		Assemble the source
+#
+assemble:
+	64tass test.asm $(ASMOPTS) -otest.xex -Ltest.lst
+#
+#		Run program without break.
+#
+run: assemble
+	x65emu -q file=test.xex	
+
+#
+#		Run program and break on 65816 NOP ($EA)
+#
+runbrk: assemble
+	x65emu -q file=test.xex break=EA

cli/minimal/test.asm

@@ -0,0 +1,38 @@
+; **************************************************************************************
+;
+;                      The worlds most simple test program.
+;
+; **************************************************************************************
+
+        .autsiz                                     ; generate code based on last REP/SEP
+;
+;       Start code at $200 (e.g. above zero page and stack)
+;
+ProgramStart = $200
+
+        * = ProgramStart-6
+        .word   $FFFF                               ; first word of XEX file
+        .word   ProgramStart                        ; first byte to copy
+        .word   ProgramEnd-1                        ; last byte to copy
+
+;
+;       This is the main code block.
+;
+        nop                                         ; so we can test the breakpoint.
+        clc                                         ; switch to 65816 mode
+        xce
+        rep     #$30                                ; 16 bit AXY
+        dec     a                                   ; A will be $FFFF hence 16 bit.
+        ldx     #$ABCD
+
+h1:     jmp     h1
+
+ProgramEnd:
+
+;
+;       The vector block follows, loaded into $FFE0 ... $FFFF
+;
+        .word   $FFE0
+        .word   $FFFF
+        .word 0, 0, 0, 0, 0, 0, 0, 0
+        .word 0, 0, 0, 0, 0, 0, ProgramStart, 0

src/test816.asm

@@ -25,6 +25,8 @@ reset:
     xba
     ; wai
 
+    nop
+
     ora $12,s
     lda ($23)
     pea $1234