Fix sign extend

mrhampson · Dec 17, 2018 · edac682 · edac682
1 parent 1c5ca25
commit edac682
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Showing 2 changed files with 4 additions and 1 deletion.
diff --git a/src/ProgramRunner.ts b/src/ProgramRunner.ts
@@ -208,6 +208,7 @@ export class ProgramRunner {
                         case Traps.TRAP_GETC:
                             /* TRAP GETC */
                             /* read a single ASCII char */
+                            let inputData = this.getInputAsync();
                             this.registers[Registers.R_R0] = this.get_char();
                             break;
                         case Traps.TRAP_OUT:
@@ -284,6 +285,8 @@ export class ProgramRunner {
     private sign_extend(x:number, bitCount:number):number {
         if ((x >> (bitCount - 1)) & 1) {
             x |= (0xFFFF << bitCount);
+            // Need to and it with this so we don't exceed 16-bits
+            x &= 0xFFFF;
         }
         return x;
     }

diff --git a/src/main.ts b/src/main.ts
@@ -9,6 +9,6 @@ for (var i = 0; i < imageData.length; i += 2) {
     imageDataUInt16[i/2] = uint16;
 }
 
-let runner = new ProgramRunner(['c']);
+let runner = new ProgramRunner([]);
 runner.readImage(imageDataUInt16);
 runner.run();