Sega Saturn DEV HARDWARE

**retro** · 07-18-2011

Originally Posted by Jackhead

The Sophia unit use an input voltage of 135V :confused: . My stepdown converter gives out 100-120V, can i use it? I never seen 135V input before. Im in 220V zone, so i dont know...

Regarding this, as I stated before, the sticker on the back should state 85-132V. This is the case with my USA model, it was the case with Legit's Japanese model, and it is stated (and illustrated) in both the Japanese and English manuals (the latter specifically mentions USA and Europe).

If anyone still doubts this, I just dug my Sophia out of storage to take a photo. You'll see the step-down transformer I use to power this operates at 110-120V.

Here's the US/European manual:

And guess how many countries run 135V mains? Yup - none! There are countries running 127V and countries running 220V, but none use anything in between... with the exception of a couple of countries with rather dodgy 220V supplies!

**Druid II** · 07-18-2011

The 85v-135v thing is just a voltage fluctuation protection. It's a normal 110v (+/- 25v) power supply. No countries actually use those values.

**dj898** · 07-18-2011

Originally Posted by retro

There are countries running 127V and countries running 220V, but none use anything in between... with the exception of a couple of countries with rather dodgy 220V supplies!

ummm... AU runs 240VAC,,, ^ ^

**retro** · 07-19-2011

Originally Posted by dj898

ummm... AU runs 240VAC,,, ^ ^

I know - so does most of Europe! What I meant is that those are the middle extremities. There are countries running 100V, 110V, 120V, 230V, 240V...... but the middle numbers are 127V and 220V, with no countries running mains voltages between those two values (apart from those with shocking fluctuation!) ;-)

**vectrex_rox** · 08-04-2011

received the sophia today ... first issue to solve is check the power supply whose T5A fuse is busted ...

here are some inside pix:

**Druid II** · 08-04-2011

Oh, so that's where that 1.003 bios dump came from.

**vectrex_rox** · 08-04-2011

Yes its 1.003 lets pray for tomorrow ;)

**vectrex_rox** · 08-05-2011

installed a fuseholder + new fuse ... power supply is working (at least in idle mode)

will test it this evening !!!

**Jackhead** · 08-05-2011

Hope you will get the unit working again my friend.

And thx retro for the pics. I belive you! ;-)

Can anyone confirm that the Cartdev rev.b works with the MD1 psu?

**retro** · 08-05-2011

Originally Posted by Jackhead

Hope you will get the unit working again my friend.

And thx retro for the pics. I belive you! ;-)

Can anyone confirm that the Cartdev rev.b works with the MD1 psu?

Hehe! ;-)

Read the manual - it'll tell you the spec for the PSU (think it's 9.2V 1.2A negative centre off the top of my head - so don't use anything that gives less current), but you're going to need to read the manual for the correct boot-up procedure.

**Jackhead** · 08-05-2011

Originally Posted by retro

Hehe! ;-)

Read the manual - it'll tell you the spec for the PSU (think it's 9.2V 1.2A negative centre off the top of my head - so don't use anything that gives less current), but you're going to need to read the manual for the correct boot-up procedure.

I do! But finding a 9.2V/9V psu with 1.2A ist near impossible. So my first thinking was using the MD1 PSU with 10V 1.2A. And of corse i read the boot sequence. But before i boot ... Sega stuff is very special with voltage :-)
So im sorry if my asking is, show me what i can use.

**retro** · 08-05-2011

No it's not. There are several on eBay, and any decent electronics wholesaler will have something, too. 9V 1.2A is very common.

If in doubt, see if it has a regulator. If it does, look up the datasheet for the regulator and see what the highest value it can tolerate is. You have your answer.

**vectrex_rox** · 08-05-2011

power to the hardware ;)

all leds on .. cd drive is seeking

and tomorrow i seek the AV cable ;)

**Druid II** · 08-05-2011

Thanks for posting all those pictures, I've yet to see any other pictures from the insides of that dev box.

**retro** · 08-05-2011

Err, there have been loads! There were certainly some of mine up before... and Legit probably took pics of his way back when! I think Kev had some on the original site, too.