On System I we are making a transition from TTL Main Boards to 
LSI main Boards. When the LSI Main board was being designed back in
Early 1985, we decided to be clever and modify a few key addresses
on the board and hence in the OS ROM to foil would-be copiers. As
is typically the case this has hurt us more than any copier. Norm
and Greg spent several hours (wee hours) last night trying to get
OS/US -114, -115 to work in their TTL Main board. Of course, -114,-115
is designed for the LSI Main and does'nt work in the TTL Main. Gotcha.
That will teach them to be so thorough. 

Here are the details on the OS/US ROMS. I will get this added to the
System I documentation on the VAX.
------------------------------------------------------------------------------
BOARD	EPROM P/N    ROM P/N      QTY BUILT	DESCRIPTION

TTL	-108,-109   -105,-106	   4120	      ORIGINAL RELEASE
	-208,-209   -205,-206	  ~3000	      FIX COIN ON 6502 RESET
	-308,-309   		      0	      FIX BONUS COIN BUG
	-408,-409		      0	      FIX EEPROM COIN CNT UPDATE BUG

LSI	-114,-115		      ?	      ABOVE BUGS FIXED;SOUND PORT MOVED 

COCK	-116,-117		   1000?      SAME AS 114/115 W/1 BIT COCK/UP
-------------------------------------------------------------------------------

NOTES:

1. OS/US BASE NUMBER IS 136032-XXX

2. LOCATION ON TTL MAIN IS 12L,13L
               LSI MAIN IS 11J,10J
    	       COCKTAIL IS  9M, 9L

3. GENERIC PART FOR OS/US EPROMS IS 27128-200; ATARI RAW P/N 137328-001