Rev.E is not tested! So far only Rev.B has been tested with an 8Mb game on a 29F800 in a 32-pin socket, and it was found to work. Use at your own risk!

This adapter installs on the backside of a SNES mask ROM. You must cut or isolate the /OE pin on the mask ROM and tie it to Vcc.

This adapter is made to work on both 32-pin and 36-pin mask ROM sockets. If using on a 32-pin socket, you will most likely have to cut off the 4 pins for clearance. You could score both sides with a utility knife or X-Acto blade and then snap it off, or use small flush cutters.

If you are using a 29F160 on a 32-pin socket, you will have to use a jumper wire for A20.

J1 connects /OE from the mask ROM socket to the TSOP chip. If you are only using a single TSOP chip, then you must close J1. If you leave J1 open, then you can use the /OE solder pad on this adapter to connect the /OE pin of the TSOP to where ever you need it.

J2 Connects TSOP /WE to +5V. Close J2 to put the TSOP into read mode. Alternatively, leave J2 open and connect the WE solder pad to SRAM /WE or cart edge connector.

C1 is for an 0603 0.1µF decoupling capacitor.

Don’t forget to isolate the bottom of the adapter to prevent shorts.

Revision History:

Rev.E

-Longer TSOP pads, easier to hand solder -Minor trace changes, added more ground vias

Rev.D

-New layout, retraced entire board -Added J2 for write enable signal

Rev.C

-Changed J1 from 0603 to custom jumper pad -Cleaned up some traces and various tolerances -Enlarged silkscreen indicators from 32 to 40 -Added Vcc via to C1 pad, removed extra vias -Moved /OE solder pad, more clearance from surrounding vias