hexadecimal link

src/hexadecimal.gmo

@@ -0,0 +1,42 @@
+# hexadecimal
+
+numeral system in base 16: it uses 16 digits, from 0 to 9 and from 'a' to 'f'.
+
+there's a direct mapping between each possible combination of 4 bits (nibble), and an hexadecimal (hex) digit:
+
++ <table>
++ <tr><th>binary</th><th>hex</th><th>dec</th></tr>
++ <tr><td>0000</td><td>0</td><td>0</td></tr>
++ <tr><td>0001</td><td>1</td><td>1</td></tr>
++ <tr><td>0010</td><td>2</td><td>2</td></tr>
++ <tr><td>0011</td><td>3</td><td>3</td></tr>
++ <tr><td>0100</td><td>4</td><td>4</td></tr>
++ <tr><td>0101</td><td>5</td><td>5</td></tr>
++ <tr><td>0110</td><td>6</td><td>6</td></tr>
++ <tr><td>0111</td><td>7</td><td>7</td></tr>
++ <tr><td>1000</td><td>8</td><td>8</td></tr>
++ <tr><td>1001</td><td>9</td><td>9</td></tr>
++ <tr><td>1010</td><td>a</td><td>10</td></tr>
++ <tr><td>1011</td><td>b</td><td>11</td></tr>
++ <tr><td>1100</td><td>c</td><td>12</td></tr>
++ <tr><td>1101</td><td>d</td><td>13</td></tr>
++ <tr><td>1110</td><td>e</td><td>14</td></tr>
++ <tr><td>1111</td><td>f</td><td>15</td></tr>
++ </table>
+
+& * 0000 is 0
+& * 0001 is 1
+& * 0010 is 2
+& * 0011 is 3
+& * 0100 is 4
+& * 0101 is 5
+& * 0110 is 6
+& * 0111 is 7
+& * 1000 is 8
+& * 1001 is 9
+& * 1010 is a
+& * 1011 is b
+& * 1100 is c
+& * 1101 is d
+& * 1110 is e
+& * 1111 is f

src/uxn_tutorial_day_1.gmo

@@ -109,7 +109,7 @@ binary words of 8-bits, also known as bytes, are the basic elements of data enco
 
 uxn can also handle binary words of 16-bits (2 bytes), also known as shorts, by concatenating two consecutive bytes. we'll talk more about this in the second day of the tutorial.
 
-numbers in uxn are expressed using the hexadecimal system (base 16), where each digit (nibble) goes from 0 to 9 and then from 'a' to 'f' (in lower case).
+numbers in uxn are expressed using the {hexadecimal} system (base 16), where each digit (nibble) goes from 0 to 9 and then from 'a' to 'f' (in lower case).
 
 a byte needs two hexadecimal digits (nibbles) to be expressed, and a short needs four.