From 418c714c453a181f9e7e99b195f320b84351fd48 Mon Sep 17 00:00:00 2001
From: Will Scullin <scullin@scullinsteel.com>
Date: Sat, 5 Aug 2023 18:27:57 -0700
Subject: [PATCH] Convert RAM to Typescript

---
 js/ram.js   | 57 -------------------------------------------------
 js/ram.ts   | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 js/types.ts | 16 ++++++++++++++
 3 files changed, 77 insertions(+), 57 deletions(-)
 delete mode 100644 js/ram.js
 create mode 100644 js/ram.ts
 create mode 100644 js/types.ts

diff --git a/js/ram.js b/js/ram.js
deleted file mode 100644
index a64c5d3..0000000
--- a/js/ram.js
+++ /dev/null
@@ -1,57 +0,0 @@
-/* -*- mode: JavaScript; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
-/* Copyright 2010-2019Will Scullin <scullin@scullinsteel.com>
- *
- * Permission to use, copy, modify, distribute, and sell this software and its
- * documentation for any purpose is hereby granted without fee, provided that
- * the above copyright notice appear in all copies and that both that
- * copyright notice and this permission notice appear in supporting
- * documentation.  No representations are made about the suitability of this
- * software for any purpose.  It is provided "as is" without express or
- * implied warranty.
- */
-
-import { base64_decode, base64_encode } from './base64';
-import { allocMemPages } from './util';
-
-export default function RAM(sp, ep) {
-    var mem;
-    var start_page = sp;
-    var end_page = ep;
-
-    mem = allocMemPages(ep - sp + 1);
-
-    for (var page = 0; page <= ep; page++) {
-        for (var off = 0; off < 0x100; off++) {
-            mem[page * 0x100 + off] = 0; // Math.floor(Math.random()*256);
-        }
-    }
-
-    return {
-        start: function() {
-            return start_page;
-        },
-        end: function() {
-            return end_page;
-        },
-        read: function(page, off) {
-            return mem[(page - start_page) * 0x100 + off];
-        },
-        write: function(page, off, val) {
-            mem[(page - start_page) * 0x100 + off] = val;
-        },
-
-        getState: function() {
-            return {
-                start: start_page,
-                end: end_page,
-                mem: base64_encode(mem)
-            };
-        },
-
-        setState: function(state) {
-            start_page = state.start;
-            end_page = state.end;
-            mem = base64_decode(state.mem);
-        }
-    };
-}
diff --git a/js/ram.ts b/js/ram.ts
new file mode 100644
index 0000000..0de775d
--- /dev/null
+++ b/js/ram.ts
@@ -0,0 +1,61 @@
+/* Copyright 2010-2023 Will Scullin <scullin@scullinsteel.com>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or
+ * implied warranty.
+ */
+
+import { base64_decode, base64_encode } from "./base64";
+import { allocMemPages } from "./util";
+import type { byte } from "./types";
+
+export interface RAMState {
+  start: byte;
+  end: byte;
+  mem: string;
+}
+
+export default class RAM {
+  mem: Uint8Array | byte[];
+
+  constructor(private start_page: byte, private end_page: byte) {
+    this.mem = allocMemPages(end_page - start_page + 1);
+
+    for (var page = 0; page <= end_page; page++) {
+      for (var off = 0; off < 0x100; off++) {
+        this.mem[page * 0x100 + off] = 0; // Math.floor(Math.random()*256);
+      }
+    }
+  }
+
+  start() {
+    return this.start_page;
+  }
+  end() {
+    return this.end_page;
+  }
+  read(page: byte, off: byte) {
+    return this.mem[(page - this.start_page) * 0x100 + off];
+  }
+  write(page: byte, off: byte, val: byte) {
+    this.mem[(page - this.start_page) * 0x100 + off] = val;
+  }
+
+  getState(): RAMState {
+    return {
+      start: this.start_page,
+      end: this.end_page,
+      mem: base64_encode(this.mem),
+    };
+  }
+
+  setState(state: RAMState) {
+    this.start_page = state.start;
+    this.end_page = state.end;
+    this.mem = base64_decode(state.mem);
+  }
+}
diff --git a/js/types.ts b/js/types.ts
new file mode 100644
index 0000000..91b2795
--- /dev/null
+++ b/js/types.ts
@@ -0,0 +1,16 @@
+/* Copyright 2023 Will Scullin <scullin@scullinsteel.com>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or
+ * implied warranty.
+ */
+
+export type byte = number;
+
+export type word = number;
+
+export type address = word;