Updated File I O (markdown)

File-I-O.md

@@ -12,7 +12,7 @@ import fileio
     // Memory alocate bitmap
     const MEMTABL = $BF58
     //
-    // File I/O error codes
+    // SOS/ProDOS error codes
     //
     const FILE_ERR_OK            = $00
     const FILE_ERR_BAD_CALL_NUM  = $01
@@ -20,10 +20,6 @@ import fileio
     const FILE_ERR_INT_TBL_FULL  = $25
     const FILE_ERR_IO            = $27
     //
-    // System I/O buffer for PLASMA. Used when loading modules, free otherwise
-    //
-    const sysbuf = $0800
-    //
     // File info struc
     struc t_fileinfo
         byte file_access
@@ -39,15 +35,39 @@ import fileio
     //
     // File functions
     //
-    predef getpfx, setpfx, getfileinfo
-    predef open, close, read, write, create, destroy, newline
-    //
-    // Block level I/O functions
-    //
-    predef readblock, writeblock
+    struc t_fileio
+        word getpfx
+        word setpfx
+        word getfileinfo
+        word open
+        word close
+        word read
+        word write
+        word create
+        word destroy
+        word newline
+        word readblock
+        word writeblock
+    end
+    word fileio
     //
     // Globally accessible error code
     //
     byte perr
 end
+```
+## The API:
+```
+fileio:getpfx(path)
+fileio:setpfx(path)
+fileio:getfileinfo(path, fileinfo)
+fileio:open(path)
+fileio:close(refnum)
+fileio:read(refnum, buf, len)
+fileio:write(refnum, buf, len)
+fileio:create(path, type, aux)
+fileio:destroy(path)
+fileio:newline(refnum, emask, nlchar)
+fileio:readblock(unit, buf, block)
+fileio:writeblock(unit, buf, block)
 ```