			EXTERNAL PROGRAMMING SYSTEM
			---------------------------
			

There are 2 boards(Diagrams shown on different sheets). One is a small ISA
board, which should be connected in the system(PC). The other bigger board
will be outside the PC.

Once you plug the ISA board, connect the 2 cables (15pin for signals, 4 pin
for Power)  between the two cards  as shown in the diagram.

Power up the system. 

On DOS prompt run the PROGRAM.EXE utility along with the Plug-n-Play resource 
data file ( say, EEPROM.BIN ).

SYNTAX
------
        PROGRAM EEPROM.BIN

Once you run the utility it will display the binary data (EEPROM.BIN).
Type "m" to go to the MENU screen which self explanatory.

For Gang programming of 5 devices follow the following sequence :

Multiple devices programming ( 5 Devices ) 
------------------------------------------


a) Type "pwrdn" -> This command will power down the outside board and the User
		   can place the PnP devices in the sockets.

b) Type "pwrup" -> This command will power up the outside board.

c) Type "ptm"   -> This will put the devices in the Test mode.

d) Type "cs"    -> This will calculate the PnP checksum and put at the 
		   appropriate location for the all the devices.

e) Type "wrmee" -> This will program all the 5 devices. 
		 
f) Type "pwrdn" -> This will power down the devices and user can replace the
		   devices.
		 

To program only one  device or fewer than 5 devices follow the following 
sequence :

Single device programming
-------------------------

a) Type "pwrdn" -> This command will power down the outside board and the User
		   can put his pnp devices in the sockets.

b) Type "pwrup" -> This command will power up the outside board.

c) Type "ptm"   -> This will put the devices in the Test mode.

d) Type "cs"    -> This will calculate the checksum's and put at the 
                   appropriate location for the device.

e) Type "wree"  -> This will ask for the devic No. which is (0 through 4) 
		   depending on which socket the device is placed.
		   (for U2 - 0, U3 - 1, U4 - 2, U5 - 3, U6 - 4).
 
f) Type "pwrdn" -> This will power down the device and user can replace the
		   device.
		 		 		 

Programming non-PnP EEPROM ( Extra 4Kbit area )
----------------------------------------------

Apart from all these the User can also read, write, write multiple the rest 
"4K e2prom" inside the chip for user data.

For these the User should not take the devices in Test mode. If they are 
already in Test mode, then he should take them out of Test mode by 
Powering Down the devices as following.


a) Type "pwrdn"
		 
b) Type "pwrup"

d) Type "wrmee4"-> This will program all the 5 devices with the same User data.
		 
e) Type "pwrdn" -> This will power down the devices and user can change the
		   devices.


If the user want to read these devices, he can do so by using commands
"rdee" and "rd4k(for User data)". These data he can display by using 
"dm" and "dm4k" respectively.

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GOOD LUCK !!
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