1 files changed, 32 insertions, 0 deletions
diff --git a/asm/sum.atk16 b/asm/sum.atk16
new file mode 100644
index 0000000..1bc3277
--- /dev/null
+++ b/asm/sum.atk16
@@ -0,0 +1,32 @@
+@use ext_std:*
+; Program: sum two values and store the result in RAM
+
+; ROM (and program execution) starts at offset 0x0
+@address 0x0
+  jpi program
+
+@label ram_offset
+  0x8000            ; store ram offset for later memory access
+
+@label program
+  ldi 10 RA         ; RA := 10
+  ldi 20 RB         ; RB := 20
+  add RA RB RC      ; RC := RA + RB
+  ldi ram_offset RD ; store address of ram_offset in RD
+  ldr RD RD         ; dereference ram_offset address
+@label debug
+  str RC RD         ; store RC in RAM
+
+; Check that 10 + 20 = 30
+  mov RC RA         ; RA := result of sum
+  ldi 30 RB         ; RB := 30
+  sub RA RB RC      ; RC := RA - RB
+  bri zero success  ; if result is zero, jump to success
+
+  ldi 2 RA          ; RA := 2 to signal failure
+  hlt
+
+; Else
+@label success
+  ldi 1 RA          ; RA := 1 to signal success
+  hlt