Shared Projects by ziggy587

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

NOT TESTED!

The multi cart function should be considered experimental. Due to the way the Genesis hardware works, the multi cart function may not work for all games.

This cart is a heavily modified version of HD Retrovision’s Genesis cart.

To use this cart for a single game, close all address jumpers (A19, A18, A17 and A16). You only need C1, C2 and U1 for a single game.

C1 - 47µF C2 - 0.1µF (0805) U1 - 29F160/800/400/200 (TSOP)

To use the multi cart function, install U2 and C3. Close the VRES jumper. The address jumpers will have to be set depending on your memory size and number of games.

See this link for a wire diagram of the 161 for multi carts: https://farm8.staticflickr.com/7529/15243929864_df0ed3686f_o.png

U2 - 74HC161 (SOIC) C3 - 0.1µF (0805)

NOT TESTED

-U1 - 74HC04 -R1 - 1 k ohm -R2 - 100 k ohm -R3 - 10 k ohm -C1 - 100 nF -C2 - 10 nF

This is an adapter that will allow you to replace the 73LS00 with a 74LS139 on a SHVC-2J3B-01 PCB. This may only be useful for a single purpose: To put the fan translated Final Fantasy 5 on an authentic Final Fantasy 5 SFC cart that uses the 2J3B board by using three 27C080’s.

Final Fantasy V is a 16 Mebibit game, but the fan translation bumps the size up to 20 Mebibit. FF5 can be found on a 1J3B board, which has a single 36-pin mask ROM, in which case patching it with the fan translation is straight forward. But FF5 also came on a 2J3B board, which has two 32-pin mask ROMs and a 74LS00, in which case it’s not so easy to patch the fan translation without some rework.

One method is to use three 8 Mebibit EPROMs (such as 27C080) but an additional 74LS139 decoder is needed for this. In this case, the 74LS00 is no longer needed. Since the 74LS00 socket already has most of the connections needed, it is a convenient place to mount the new 139 (using this adapter). You will need to remove the 74LS00 from the board. And you will need to add two jumper wires: A21 (pin-14 on the 74LS139 that comes on the 2J3B) and /OE3 which you will connect to the /OE pin of your third EPROM. Be sure to connect EPROM 1 and 2 to the correct socket on the board.

There are drill holes on this adapter PCB located close to the OE3 and A21 pads. They are there so that you can more neatly route the jumper wires for those pads.

C1 is for a 0.1µF capacitor in the 0603 package.

If you want to use the SNES ROM Utility SwapBin function to prepare your 20 Mebibit fan translated ROM, you must first expand it to 24 Mebibits. What I suggest doing is copying the last 4 Mebibits and pasting it onto the end of the ROM and that will expand the ROM to 24 Mebibits. Then, use the split ROM and SwapBin functions of the SNES ROM Utility. That will output 3 files that are 8 Mebibits each, ready to burn to 27C080 or 27C801 EPROMs. Of the three split files, install the first one in socket P0, the second one in socket P1, and then wire the /OE pin from the third one to the OE3 pad on this adapter board. The third EPROM will have to be installed upside down on the bottom side of the board.

This is a simple circuit that will turn on an ATX power supply using a momentary switch. I made this specifically to use an AT style motherboard in an ATX case, however, you could use this generically in any case that you want to turn an ATX PSU on/off using a momentary switch.

The mounting hole is sized to fit a 6-32 screw so that you can mount the board using a standard motherboard standoff.

If using one of those common AT-to-ATX power adapters, you will most likely have to add a pin/wire for the +5VSB signal.

A parts list is silkscreened on the back of the PCB. Resistors and capacitors are 0805 size. You can use standard 2.54mm single row pin headers for the switch and PSU connections.

This has been tested using an AT motherboard and ATX power supply for several hours and found to work as intended. But as always, use at your own risk.

This circuit was taken from a post found on Stack Exchange. More info can be found here: https://electronics.stackexchange.com/questions/186841/momentary-button-as-switch