extend docs

examples/asm/functional_test/README.md

@@ -1,9 +1,5 @@
 # 6502 Functional Test
 
-This binary was taken from
-https://github.com/Klaus2m5/6502_65C02_functional_tests
-Copyright (C) 2013  Klaus Dormann
-
 This is a test suite for 6502/65C02/65C816 processors. It contains a plethora of
 tests, which covers all documented opcodes.
 
@@ -12,3 +8,22 @@ pre-built binaries were used instead. That is because the source code is not
 compatible with the assembler used by the [cc65](https://cc65.github.io/cc65/)
 toolchain.
 
+## Building
+
+```bash
+make build
+```
+
+This will create a `6502_functional_test.bin` file in the `build` directory,
+which the emulator will load.
+
+## Credits
+
+Taken from 
+https://github.com/amb5l/6502_65C02_functional_tests
+which is a CA65-compatible port of
+https://github.com/Klaus2m5/6502_65C02_functional_tests
+
+The original source code was written by Klaus Dormann, and is licensed under
+the GPL-3.0 license.
+```

examples/functional.rs

@@ -24,7 +24,7 @@ fn main() {
         // Use `fetch_next_and_decode` instead of
         // `single_step` to see the decoded instruction
         if let Some(decoded_instr) = cpu.fetch_next_and_decode() {
-            println!("{decoded_instr:?}");
+            println!("{decoded_instr}");
             cpu.execute_instruction(decoded_instr);
         }
         cpu.single_step();