[May/12/96]


        STAR TREK   CHIP LOCATION

CHIP #   POSITION  TYPE
-------------------------
1607A    U7        2716    SPEECH BOARD
1871A    U6        2732     "
1872A    U5        2732     "
1848F    U1        2716    ROM BOARD
1849F    U2         "       "
1850F    U3         "       "
1851F    U4         "       "
1852F    U5         "       "
1853F    U6         "       "
1854F    U7         "       "
1855F    U8         "       "
1856F    U9         "       "
1857F    U10        "       "
1858F    U11        "       "
1859F    U12        "       "
1860F    U13        "       "
1861F    U14        "       "
1862E    U15        "       "
1863E    U16        "       "
1864E    U17        "       "
1865E    U18        "       "
1866E    U19        "       "
1867E    U20        "       "
1868E    U21        "       "
1869E    U22        "       "
1870E    U23        "       "
1873A    U25        "       "
S-C      U39       2708   XY TIMING BOARD

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[08/04/97]

This ZIP file should contain the following files:
	1848m.bin	[modified]
	1849m.bin
	1850.bin	[non-modified]
	1851.bin
	1852m.bin
	1853m.bin
	1854m.bin
	1855m.bin
	1856m.bin
	1857.bin
	1858.bin
	1859.bin
	1860m.bin
	1861.bin
	1862.bin
	1863.bin
	1864.bin
	1865.bin
	1866.bin
	1867.bin
	1868.bin
	1869.bin
	1870.bin
	cpu1873.bin
	1670.bin (on speech bd)
	1871.bin (on speech bd)
	1872.bin (on speech bd)
	readme.txt (this file)
	instr.txt

Note: All the EPROM images for STAR TREK are included in this package.



[Jun/27/97]

 The follow text describes how to convert your Sega STAR TREK so that the Security
Chip (P/N 315-0064), located on the CPU board at location U21, is not needed to
operate the game. Once converted, the game will operate exactly the same way as
the original.

Items you will need: 	
	A working Sega STAR TREK board set with card cage,
	8 EPROMs, type 2716 or 2516 (Do not use TI 2716s),
	EPROM Programmer
	the 8 .bin files - 1848m, 1849m, 1852m thru 1856m and 1860m
	40 pin DIP socket (for shunt),
	#28 or #30 AWG wire wrap wire,
	Soldering iron & solder,
	various hand tools.

I STRONGLY suggest that all work be done at a static free workstation and a
grounding wrist-strap be worn while working on the boards.

Also, to avoid confusion later, make notes of all connector locations and
orientations before you pull the boards out of the chassis.

Step 1) Read above sentence again. Open card cage and remove the EPROM board
	and the CPU board.
Step 1)	Program the blank EPROMs with the provided images.
Step 2) Carefully remove the following EPROMs from the EPROM Board:
	U1 (#1848), U2 (#1849), U5 (#1852) thru U9 (#1856) and U13 (#1860)
Step 3) Install the 'm' versions of the EPROMS into the sockets. Check the
	orientation of the IC's and watch for bent pins.
Step 4) Carefully solder the connections listed below. I suggest that the
	DIP socket being used for the shunt be plugged into another 40 pin
	DIP while soldering the wires. Try to use as little heat as possible
	else the DIP socket will melt.
Step 5) Remove the Security Chip from the socket at location U21 on the CPU
	board. Plug the completed DIP shunt into 40 pin socket.
Step 6) Double check all work. Plug the boards back into the chassis and 
	reconnect all connectors. Check for proper orientation.

Conversion Complete.

Table 1. DIP Shunt 'from-to' List for location U21 (40 pin)
		pin 34 to pin 40,
		pin 32 to pin 39,
		pin 33 to pin 38,
		pin 29 to pin 37,
		pin 30 to pin 36,
		pin 31 to pin 35,
		pin 27 to pin 28,
		pin 20 to pin 21.

-
