n64 portable 'the monster' progress thread (8/7/2010)

Includes but not limited to: SNES, Genesis, Sega CD, PlayStation 1, Nintendo 64, Dreamcast, Game Gear and I guess the Virtual Boy.

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tsukasa
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Joined: Sun Jul 11, 2010 8:17 pm

n64 portable 'the monster' progress thread (8/7/2010)

Post by tsukasa »

Started this last week.
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Case is 3 wooden frames I got from hobby lobby, glued together with the bottom cut out of one. I've epoxied and bondo'd the buttons from a 3rd party pad into the top.

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Revision 4 n64 mobo.

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I was so happy when I finally got the display working. It's a 7" lcd from a portable tv, accepts rgb straight to the panel's board, so I've done the rgb mod to the n64.

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I've removed part of the ground trace on the board so I have somewhere stable to mount the connector for the display.

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As I'm using rgb, I've tossed the tuner board from the tv, takes up way too much space also.

I'd already done the cart relocation and everything was working smooth.......

Had a fan to cool everything, closed up the case, powered up and......

ZZZZaaaappppp.

A loose wire I'd missed hung down into the fan, and stalled the motor, effectively shorting my 5V rail to ground. (I was powering the fan off the 5v regulator since the 12v was too noisy).

The short took out all of my a/v section. Confirmed this by heading back to the lab and probing around a bit with the scope.

The board itself still works fine, a/v section is completely dead. Unless there's some master component that might've blown and saved the dacs, it's toast until I repair it.

So I ran down to the used game store on campus to snag another n64, not expecting it to be a rev3 or rev4 board, but knowing that my backup n64 was an earlier unit. I get back, open up my backup n64, only to find that it's a rev5. So I open up the one I just bought, and it's a rev6. :cry:

Remembering that my brother had recently bought one, I called him up.
He read the serial number off to me, and based on the serial numbers list, it's likely that his is a rev3 or rev4 board, so I'll be trading one of mine with his this weekend.

More pics to follow, plus updates once I get ahold of a usable board.

UPDATE:
The one my bro had was indeed a revision 4, so I redid all my work, except this time I pulled the rgb from the caps on the back of the board, instead of lifting the pins and adding some passives, the picture looks much better now. A little bit of tweaking on the back of the LCD board, and the picture was beyond perfect. All the edges and lines are crisp and sharp, the colors are vibrant and lifelike. I can count the pixels on everything it's so sharp, I'm lovin' it.

I don't have the batteries done yet but I'm working on that, should have it done either tonight or tomorrow.
I've got a 2800mah 7.4v rechargable pack from a portable dvd player with built-in charging circuitry, and a 2000mah 14.8v laptop battery.
Gutted both, and I plan to string them all together in series parallel for some serious juice, provided I can find space in the case.

The back of the case gets really hot during operation, but it ran fine for at least an hour without any glitches.
I'm just using gpu heatsinks on all the chips atm, need to cut one down to put on the expansion pack.

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The new revision 4 board, minus a cart slot.

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Running OoT while testing. Pic does not do the screen justice.
Last edited by tsukasa on Sun Aug 08, 2010 4:42 pm, edited 2 times in total.
lovablechevy
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Re: n64 portable 'the monster' progress thread

Post by lovablechevy »

looking good so far! sorry to hear about the set back... hope you're able to get the right board.
they call me the Queen of Bondo, though maybe i should be called the Queen of Epoxy Putty

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current project - code name: blue mushroom!
limpport
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Re: n64 portable 'the monster' progress thread

Post by limpport »

Looks really promising so far (despite the setback). What is the screen you are using, like the brand and such?
tsukasa
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Re: n64 portable 'the monster' progress thread

Post by tsukasa »

I don't have the box on me atm, but the plastic casing from the screen just says 'super' on it. I've looked over both pcbs as well; nothing. Presumably some cheap Chinese screen, I don't actually remember seeing any brand name on the box. Got it at a garage sale for $10, he had two of em, shoulda bought both, lol.
tsukasa
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Re: n64 portable 'the monster' progress thread (7/19/2010)

Post by tsukasa »

Updated (7/19/2010)
tsukasa
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Joined: Sun Jul 11, 2010 8:17 pm

Re: n64 portable 'the monster' progress thread (7/19/2010)

Post by tsukasa »

Got my dc-dc converter, turns out the charging/protection circuitry that came with the battery pack (Li-ion) I'm using is acting funky.

When I'm charging, but not running the n64, I can read 12v on the output from the battery just fine (this is the charging level), when running just off the batteries I get 7.4v, which I expect.

When I turn on the n64, the battery stops charging for some reason, and it runs straight off the battery.

Could someone either suggest a good battery, or point me towards a charger schematic that would allow me to play off the charger's power whilst charging?

EDIT:

Nvm, just connected the output of the battery with the input of the charger through a pair of diodes.

Code: Select all

12v plugpack >-------------|>|------|
7.4v out from battery >-----|>|------+------->pth08000
tsukasa
Posts: 45
Joined: Sun Jul 11, 2010 8:17 pm

Re: n64 portable 'the monster' progress thread (7/19/2010)

Post by tsukasa »

Sorry for going so long without any updates.....

The handheld is currently in working condition, though it still lacks a few things I'd like to add, notably video out, extra controller ports, LOB64 compatibility, dpad, and an L button/Z button selector switch.

I'm beginning to hate the wood case I'm using, it's too flimsy and large, so I'm going to completely redo the project altogether.

I'd like to vacuum form a case eventually, and possibly remove the memory expansion connector.

(maybe I'll take the ram off my dead n64 and piggyback it onto the ram on this board, so I can use a jumper pack instead of the harder to cut down expansion pack, has this been done before?)

I'm going to do up AutoCAD drawings for all of my parts and see if I can't come up with a much more compact design; the hard part is that my screen is so large, it limits how small I can make my case.
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