Adding doc for Shrinkit and GameDOS.

documentation/gamedos-readme.txt

@@ -0,0 +1,26 @@
+GAMEDOS
+=======
+
+  struct gd_dirent {
+    char type;                /* 'A' = Applesoft, 'B' = Binary */
+    unsigned char track1;
+    unsigned char sector1;
+    unsigned short int meta;  /* load addr for Binary,
+                                 end of code addr for Applesoft */
+    char filename[26];        /* space-padded */
+    unsigned char len;        /* in sectors; file must be contiguous */
+  };
+  
+  There are 16 dirents, stored from $BE00 up (track 00 sectors E and F)
+  
+  The following types are defined but not yet implemented:
+  
+    * T - Text
+    * S - System, loads at $0800 (NOT $2000 as ProDOS!)
+    * P - Picture, loads at $2000
+    * I - Integer Basic
+    
+  GameDOS hooks the reset vector and the jump instruction at $03D0.
+  
+  I've got a program for qbasic that outputs GameDOS disks but it's clumsy
+  and I'd rather use 6502 code for that purpose.