From ef251a52a74db9a519dbb5c4fabbc4c3f5d3cfe9 Mon Sep 17 00:00:00 2001
From: "Daniele Verducci (ZenPenguin)" <danieleverducci@gmail.com>
Date: Sat, 26 Dec 2020 12:40:39 +0100
Subject: [PATCH] Hello world program to be used for monitor demo

---
 assembly/applications/hello_world.asm | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 assembly/applications/hello_world.asm

diff --git a/assembly/applications/hello_world.asm b/assembly/applications/hello_world.asm
new file mode 100644
index 0000000..19a6502
--- /dev/null
+++ b/assembly/applications/hello_world.asm
@@ -0,0 +1,16 @@
+; Prints "Hello world" in terminal
+; Usage: assemble this file with z80asm and insert the resulting bytes
+; via Memory Monitor from address 0xA000 to test SET and RUN commands.
+
+org 0xA000  ; Set starting position to ram
+ld bc, HELLO_WORLD_STR
+Term_print:
+    ld a, (bc)  ; bc is the pointer to string's first char
+    cp 0        ; compare A content with 0 (subtract 0 from value and set zero flag Z if result is 0)
+    jp z, term_print_end
+    out (0x00),a    ; output char to IO device 0, addr 0
+    inc bc ; increment bc to move to next char
+    jp Term_print
+	term_print_end:
+	halt
+HELLO_WORLD_STR: DB "Hello world!",0
\ No newline at end of file