README mod

README.md

@@ -1 +1,31 @@
-# jataricart
+# JatariCart
+
+This software is for use with my super simple flash cartridge (no gals, only 3 74xx elements and some caps and resistors). Top side is that without elements.
+
+The cartridge is driven by addresses D500-D580; write to D500 sets the first bank - this is boot bank. Write to D501 sets second bank etc. The max usable number with cart on is set by write to D51F; write to D580 switches off the cartridge.
+
+The internal construction of JatariCart allows utilise max 256kB of flash memory (32 banks)
+
+Remember to fool the Operating System not to hang up by cart on/off, by:
+
+carton (x - bank to switch) 
+        pha 
+        sta $D580,x
+        sta wsync ; needed for ntsc, no big difference in speed 
+        sta wsync ; needed for ntsc 
+        lda trig3 
+        sta gintlk 
+        pla 
+        rts  
+
+
+
+flashwritelib.asx - 6502 code library for formatting flash/formatting sector and write byte.
+
+flashsrite.asx - 6502 code for generate flasher (when compiled, it contains either flash routines and cartridge image itself)
+
+crc16_v2.asm - crc16 library for fast checking every sector (when flash is damaged, it happens that write sector damages another)
+
+Compile (mads needed, http://mads.atari8.info):
+
+mads flashwrite.asx -o:flashwrite.xex