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-rw-r--r--instructions/STY.ts8
1 files changed, 8 insertions, 0 deletions
diff --git a/instructions/STY.ts b/instructions/STY.ts
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+++ b/instructions/STY.ts
@@ -0,0 +1,8 @@
+import type The65c02 from "../65c02.ts";
+
+export default function (this: The65c02, mode: string) {
+    const addr = this.getAddr(mode);
+    this.io.address.set(addr);
+    this.io.data.set(this.regY.num())
+    this.write();
+}
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