dos kernel wip

assets/bios1.js

@@ -1,6 +1,10 @@
 println("TERRAN Megatrends inc.");
 //println("Main RAM:"+(system.maxmem() >> 10)+" KBytes");
 
+///////////////////////////////////////////////////////////////////////////////
+
+// Perform memtest
+
 let memptr = 0;
 const memtestptn = [
     // Overclockers will LOVE this!
@@ -62,4 +66,20 @@ catch (e) {
     }
 }
 
+///////////////////////////////////////////////////////////////////////////////
+
+// probe bootable device
+
+var _BIOS = {};
+
+// Syntax: [Port, Drive-number]
+// Port #0-3: Serial port 1-4
+//      #4+ : Left for future extension
+// Drive-number always starts at 1
+_BIOS.FIRST_BOOTABLE_PORT = [0,1]; // ah screw it
+
+Object.freeze(_BIOS);
+
+///////////////////////////////////////////////////////////////////////////////
+
 con.move(4,1);

assets/serialtest.js

@@ -1,36 +1 @@
-function getStatusMessage(portNo) {
-    return com.sendMessageGetBytes(portNo, "DEVSTU"+String.fromCharCode(0x17));
-}
-
-let ba = com.sendMessageGetBytes(0, "DEVNAM"+String.fromCharCode(0x17));
-serial.println(ba);
-
-ba = com.pullMessage(0)
-serial.print(ba);
-serial.println("# END OF MSG");
-
-
-
-ba = com.sendMessageGetBytes(1, "DEVNAM"+String.fromCharCode(0x17));
-serial.println(ba);
-
-serial.println(getStatusMessage(1));
-
-ba = com.sendMessageGetBytes(1, "LIST");
-ba = com.pullMessage(1);
-println(ba);
-
-serial.println(getStatusMessage(1));
-
-com.sendMessage(1, "OPENR\"fsh.js\"");
-
-println("Status code: "+com.getStatusCode(1));
-
-com.sendMessage(1, "READ");
-println("Status code: "+com.getStatusCode(1));
-let source = com.pullMessage(1);
-println(source);
-
-eval(source);
-
-serial.println("k bye")
+println("Hello, world!");

assets/tvdos/TVDOS.SYS

@@ -0,0 +1,55 @@
+// Boot script
+var _TVDOS = {};
+_TVDOS.DRIVES = {}; // Object where key-value pair is <drive-letter> : [serial-port, drive-number]
+// actually figure out the drive letter association
+// Drive A is always the device we're currently on
+_TVDOS.DRIVES["A"] = _BIOS.FIRST_BOOTABLE_PORT;
+
+
+
+Object.freeze(_TVDOS);
+
+///////////////////////////////////////////////////////////////////////////////
+
+var filesystem = {};
+filesystem._toPorts = function(driveLetter) {
+    let port = _TVDOS.DRIVES[driveLetter.toUpperCase()];
+    if (port === undefined) {
+        throw Error("Drive letter '" + driveLetter.toUpperCase() + "' does not exist");
+    }
+    return port
+};
+filesystem._close = function(portNo) {
+    com.sendMessage(portNo, "CLOSE");
+};
+filesystem._flush = function(portNo) {
+    com.sendMessage(portNo, "FLUSH");
+};
+// @return true if operation committed successfully, false otherwise; throws error
+//         if unknown mode or invalid drive letter was given
+filesystem.open = function(driveLetter, path, operationMode) {
+    let port = filesystem._toPorts(driveLetter);
+
+    filesystem._flush(port[0]); filesystem._close(port[0]);
+
+    let mode = operationMode.toUpperCase();
+    if (mode != "R" && mode != "W" && mode != "A") {
+        throw Error("Unknown file opening mode: " + mode);
+    }
+
+    com.sendMessage(port[0], "OPEN"+mode+'"'+path+'",'+port[1]);
+    let response = com.getStatusCode();
+    return (response == 0);
+};
+// @return the entire contents of the file in String
+filesystem.readAll = function() {
+    let port = filesystem._toPorts(driveLetter);
+    com.sendMessage(port[0], "READ");
+    let response = com.getStatusCode();
+    if (response < 0 || response >= 128) {
+        let status = com.getDeviceStatus(port[0]);
+        throw Error("Reading a file failed with "+status.code+": "+status.message);
+    }
+    return com.pullMessage(port[0]);
+};
+Object.freeze(filesystem);

assets/tvdos/command.js

@@ -1,5 +1,5 @@
 const DOS_VERSION = "1.0";
-const PROMPT_TEXT = ">";
+let PROMPT_TEXT = ">";
 let CURRENT_DRIVE = "A";
 
 let shell_pwd = [""];