initial state

Cargo.lock

@@ -224,9 +224,21 @@ version = "0.1.0"
 dependencies = [
  "clap",
  "minifb",
+ "rand",
  "spin_sleep",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "heck"
 version = "0.4.0"
@@ -437,6 +449,12 @@ version = "0.3.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6ac9a59f73473f1b8d852421e59e64809f025994837ef743615c6d0c5b305160"
 
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
 [[package]]
 name = "proc-macro-error"
 version = "1.0.4"
@@ -479,6 +497,36 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
 [[package]]
 name = "raw-window-handle"
 version = "0.3.4"
@@ -664,6 +712,12 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.84"

Cargo.toml

@@ -8,4 +8,5 @@ edition = "2021"
 [dependencies]
 clap = {version = "4.1.1", features = ["derive"]}
 spin_sleep = "1.1.1"
-minifb = "0.23"
+minifb = "0.23"
+rand = "0.8.5"

src/main.rs

@@ -67,6 +67,7 @@ struct Args {
 }
 
 fn cpu_ram_init(cpu: &mut CPU) {
+    cpu.memory.set(0xFF04, 0xAD);
     cpu.memory.set(0xFF10, 0x80);
     cpu.memory.set(0xFF11, 0xBF);
     cpu.memory.set(0xFF12, 0xF3);
@@ -86,6 +87,9 @@ fn cpu_ram_init(cpu: &mut CPU) {
     cpu.memory.set(0xFF47, 0xFC);
     cpu.memory.set(0xFF48, 0xFF);
     cpu.memory.set(0xFF49, 0xFF);
+    for i in 0xC000..0xE000 {
+        cpu.memory.set(i, if rand::random() { 0xFF } else { 0x00 });
+    }
 }
 
 static mut PAUSE_ENABLED: bool = false;

src/processor/mod.rs

@@ -200,8 +200,7 @@ impl Default for Registers {
     fn default() -> Self {
         // default post-bootrom values
         Self {
-            af: 0x00B0,
+            af: 0x01B0,
-            // af: 0x01B0,
             bc: 0x0013,
             de: 0x00D8,
             hl: 0x014D,