document specialized item box format

src/ItemData.hh

@@ -81,13 +81,14 @@ struct ItemData {
 
   // QUICK ITEM FORMAT REFERENCE
   //           data1/0  data1/4  data1/8  data2
-  //   Weapon: 00ZZZZGG SSNNAABB AABBAABB 00000000
-  //   Armor:  0101ZZ00 FFTTDDDD EEEEXXXX 00000000
-  //   Shield: 0102ZZ00 FFTTDDDD EEEEXXXX 00000000
-  //   Unit:   0103ZZ00 FF00RRRR 0000XXXX 00000000
-  //   Mag:    02ZZLLWW HHHHIIII JJJJKKKK YYQQPPVV
-  //   Tool:   03ZZZZUU 00CC0000 0000XXXX 00000000
-  //   Meseta: 04000000 00000000 00000000 MMMMMMMM
+  //   Weapon:    00ZZZZGG SSNNAABB AABBAABB 00000000
+  //   Armor:     0101ZZ00 FFTTDDDD EEEEXXXX 00000000
+  //   Shield:    0102ZZ00 FFTTDDDD EEEEXXXX 00000000
+  //   Unit:      0103ZZ00 FF00RRRR 0000XXXX 00000000
+  //   Mag:       02ZZLLWW HHHHIIII JJJJKKKK YYQQPPVV
+  //   Tool:      03ZZZZUU 00CC0000 0000XXXX 00000000
+  //   Tech disk: 0302&&UU %%CC0000 0000XXXX 00000000
+  //   Meseta:    04000000 00000000 00000000 MMMMMMMM
   // A = attribute type (for S-ranks, custom name; last pair is kill count for some weapons)
   // B = attribute amount (for S-ranks, custom name; last pair is kill count for some weapons)
   // C = stack size (for tools)
@@ -113,6 +114,8 @@ struct ItemData {
   // X = kill count (big-endian; high bit always set)
   // Y = mag synchro
   // Z = item ID
+  // & = technique level
+  // % = technique number
   // Note: PSO GC erroneously byteswaps data2 even when the item is a mag. This
   // makes it incompatible with little-endian versions of PSO (i.e. all other
   // versions). We manually byteswap data2 upon receipt and immediately before