XYmodem.doc
Never written one of these so here goes nothing..

Transfer the library to your hp48.
Store it in a port of your choice.
Power cycle the hp, or hit the ON-C combination

Go to the library menu, and there you will find the XY-modem library.

The commands:

xSENDXY:
	"Global name" :  Sends the object stored in this name using Y-modem protocal.the name is also sent
		         so the computer will store the object under the same name.
	example:  'Blah' xSEND 
	
	"Local Name":   Same as Global name.
	
	:IO: name:         Sends Backup of the homedir to the PC..( similar to the ARCHIVE command )
		         file is send using the y-modem protocal.
		         
	:n:Name/Real:    Sends the object in port N using the Name/real for the name on the PC end
	example:   :0:blah  xSEND results in the file P0$blah being created on the PC.

	NOTE: Userflag 56 controls the size of the data packet.  If set the packet size is 1024 bytes, else
		128 byte packets are used.  alos note, that if the 1024 option is set the program will
		automaticly switch to the 128 byte option when the end of the file is near.	
	
xXRECV:
	receives a file using X-modem protocal.  User Flag 57 toggles CRC or checksum error detection.
	If flag 57 is set, then CRC is used else checksum.
	
xYRECV:
	receives a file using y-modem protocal. User flag 58 controls weither or not the object is kept on the stack
	after transfer.  System flag 36 controls wither or not the object will overwrite any already existing object.
	Note: there is only CRC error detection for y-modem, so user flag 57 is ignored.
	Second Note:  When receiving a library or a backup object, the object is kept on the stack no matter what
		     the flag settings are..	
Flags:
	-36 control overwrite.  If set overwrite any object with the one being received
	56 controls the size of the data packet. if set 1024 byte, else 128 byte packets are used.
	57 controls the CRC or checksum error detection in xmodem receive.
	58 controls weither or not the received object is kept on the stack or stored in a variable.
	
	
	
Feed back is welcome, both good and bad.

Will Laughlin
laughw@rpi.edu   http://www.eng.rpi.edu/~laughw