Updated information on Adventures in Math (1983)

apps/pcx86/1983/adventmath/README.md

@@ -100,25 +100,14 @@ Another unexpected file was **BASICA.EXE** (54277 bytes) from 1999.  It seems un
 *any* BASIC binary with this game, because DOS was a prerequisite, and at the time, all versions of DOS included BASIC.
 IBM's PC-DOS shipped with **BASICA.COM** and OEM versions of DOS shipped with either **GWBASIC.EXE** or **BASIC.EXE**.
 
-Curiously, the **BASICA.EXE** from [COMPAQ DOS 1.11](/disks/pcx86/dos/compaq/1.11/) is exactly 5 bytes smaller, and both
-files contain the following strings:
+Unsurprisingly, this **BASICA.EXE** is neither from 1999 nor from IBM.  It's virtually identical to the circa 1983
+**BASICA.EXE*** found in [COMPAQ DOS 1.11](/disks/pcx86/dos/compaq/1.11/), except that it is 5 bytes larger, due to the
+addition of "MsDos" at the end of the file.  It contains the following strings:
 
 	The COMPAQ Personal Computer BASIC
 	Version 1.13
 	(C) Copyright COMPAQ Computer Corp. 1983
 
-In fact, the only differences are in first few and last few bytes:
-
-	1c1
-	< 00000000  4d 5a 05 00 6b 00 00 00  20 00 7a 03 ff ff 00 00  |MZ..k... .z.....|
-	---
-	> 00000000  4d 5a 20 01 6a 00 00 00  20 00 00 00 ff ff 00 00  |MZ .j... .......|
-	3196,3197c3196
-	< 0000d400  4d 73 44 6f 73                                    |MsDos|
-	< 0000d405
-	---
-	> 0000d400
-
 It's safe to say that IBM would not have distributed a COMPAQ binary; if IBM had distributed any BASIC binary at all,
 it would have been their own **BASICA.COM**.  Of course, the problem with IBM's **BASICA.COM** is that it also requires
 an IBM PC with ROM BASIC installed, which is why some people would have preferred the COMPAQ binary: it had no ROM

versions/pcx86/1.35.1/pcx86-uncompiled.js

@@ -49377,28 +49377,7 @@ class Video extends Component {
                  * At this point, xThird and yThird should both be one of 0, 1 or 2, indicating which horizontal and
                  * vertical third of the virtual screen the touch event occurred.
                  */
-                if (/* xThird == 1 && */ yThird != 1) {
-                    if (!yThird) {
-                        this.kbd.addActiveKey(Keyboard.CLICKCODES.UP, true);
-                    } else {
-                        this.kbd.addActiveKey(Keyboard.CLICKCODES.DOWN, true);
-                    }
-                } else if (/* yThird == 1 && */ xThird != 1) {
-                    if (!xThird) {
-                        this.kbd.addActiveKey(Keyboard.CLICKCODES.LEFT, true);
-                    } else {
-                        this.kbd.addActiveKey(Keyboard.CLICKCODES.RIGHT, true);
-                    }
-                }
-                else {
-                    /*
-                     * Why simulate a SPACE if the tap is in the middle third of the screen?  Well, apparently I
-                     * didn't explain earlier that the WHOLE reason I originally added KEYGRID support (before it was
-                     * even called KEYGRID support) was to make the 1985 game "Rogue" (pcjs.org/apps/pcx86/1985/rogue)
-                     * more fun to play on an iPad, because arrows and spaces are the most commonly used keys.
-                     */
-                    this.kbd.addActiveKey(Keyboard.SIMCODE.SPACE, true);
-                }
+                this.kbd.addActiveKey(Video.KEYGRID[yThird][xThird], true);
             }
         } else {
 
@@ -53767,6 +53746,18 @@ Video.TOUCH = {
     MOUSE:      2
 };
 
+/*
+ * Why simulate a SPACE if the tap is in the middle third (center) of the screen?  Well, apparently
+ * I didn't explain earlier that the WHOLE reason I originally added KEYGRID support (before it was
+ * even called KEYGRID support) was to make the 1985 game "Rogue" (pcjs.org/apps/pcx86/1985/rogue)
+ * more fun to play on an iPad, and space is a commonly required key.
+ */
+Video.KEYGRID = [
+    [Keyboard.SIMCODE.HOME, Keyboard.SIMCODE.UP,    Keyboard.SIMCODE.PGUP],
+    [Keyboard.SIMCODE.LEFT, Keyboard.SIMCODE.SPACE, Keyboard.SIMCODE.RIGHT],
+    [Keyboard.SIMCODE.END,  Keyboard.SIMCODE.DOWN,  Keyboard.SIMCODE.PGDN],
+];
+
 /*
  * Port input/output notification tables
  *