Zig's SNES Repros

[kogami]

I do not well manage to see what you made

You raised two pines (Pin 23 and 33) and you connected them together?
Similar for pine 1 to the GND?



But I understand not the blue thread?

[Ziggy]

The blue wire is going to the 5v pad (23). That's where I took the power from (but you can take it from anywhere after the cap). Pins 1, 23 and 33 are all connected together, getting roughly 3.3v. Look at the pinout for the 29L3211:

IMAGE

Pins 23 and 33 are Vcc and BYTE. The board supplies 5v on these pins, but the 29L3211 needs a 3.3v (+/-10%) power supply, that's why those pins are lifted (you could cut the trace if you want, I decided to lift the pins). Pin 1 is WE, which also needs Vcc (WE is active when set low). That pad on the board is NC, so you can leave that pin down. The white wire going to the negative side of the cap is the ground for the voltage divider I used to step the 5v down to 3.3v. So this is sort of what I did:

IMAGE

[kogami]

OK thus if I well understood

[Ziggy]

No. The SNES board only has +5v power. You have to step the +5v down to +3.3v for the 29L3211. I used a voltage divider: http://en.wikipedia.org/wiki/Voltage_divider . You don't have to use a voltage divider to get 3.3v, that's just the way I did it. You can use diodes or a voltage regulator if you wish, what ever you want.

edit: DO NOT USE THIS METHOD. Using only a voltage regulator or divider for 3v memory on a 5v supply can damage the cart and/or the console! To safely use 3v memory with a 5v supply you need to use a regulator as well as a logic level shifter!

[kogami]

I admit you that I had not well understood
But now it is good

A last question
R1 and R2 = ?? ohm

Because I think that I am going to proceed as you

[Ziggy]

edit: DO NOT USE THIS METHOD. TO safely use 3.3v memory with a 5v supply you need a voltage regulator as well as a logic level shifter. If you use only a regulator or voltage divider, you risk damage to the cart and/or console!

[Mute City Electronic]

I admit you that I had not well understood
But now it is good

A last question
R1 and R2 = ?? ohm

Because I think that I am going to proceed as you

Code: Select all

Ground----------R1 (2 ohm)-------------{+3.3v}-------------R2 (1 ohm)-----------------+5v

That should do the trick, i worked that out quickly and I havn't test it yet so keep that in mind.

[Ziggy]

edit: DO NOT USE THIS METHOD. TO safely use 3.3v memory with a 5v supply you need a voltage regulator as well as a logic level shifter. If you use only a regulator or voltage divider, you risk damage to the cart and/or console!

[Spitfirethunderbolt]

Hi Ziggy587, I'm new on forum and I would like know, if is possible send one repro of Star Ocean to Brazil ?

[16bitz]

Hey guys. Long story short i used to make a lot of repo's but then as usual life got in the way I used the stacking method which worked like a treat, but obviously a hr of soldering and $50 on eproms and doners was a joke and gave the tsop adapter a try but failed miserably and raged quit

nways, now i got a bit of free time and determined to get these to work! Im pretty sure half my original problem is that i was using (and still am) a crummy $20 soldering iron and tip. Is there a good iron and tip(s) somebody could recommend for these? I do use it quite frequently so im willing to justify $100+ as i will get some good use out of it.

Regards,
16bitz