Topic: Wanted: DreamCast part  (Read 3139 times)

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Offline Phu

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Wanted: DreamCast part
« on: July 20, 2011, 08:12:11 PM »
This is a highly optimistic post, but you never know.

I finally managed to find a circuit diagram of the audio circuit for the DreamCast. Using an oscilloscope I've determined that the audio DAC is dead. Thankfully the ARM7 audio processor still works (yay!) but there's nothing to convert the bitstream to analog audio.

Before I go and investigate possible alternate parts/circuits, would anyone happen to have an otherwise dead DreamCast that they'd be willing to extract a chip from?

Specifically it is IC303, located in the top right corner of the mainboard. It may have a SEGA part number or a more commonplace PCM1725U part number. It is a 16-pin surface mount part and is probably located very near to IC304 - an 8-pin surface op-amp.

If any of the soldering-savvy members out there think they might be able to extract this, let me know ;)

-- Richard
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Offline porchy

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Re: Wanted: DreamCast part
« Reply #1 on: July 20, 2011, 09:21:39 PM »
you may be in luck my friend
ill scurry out to my geek lair and check my parts bin

Offline Phu

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Re: Wanted: DreamCast part
« Reply #2 on: July 21, 2011, 08:52:54 AM »
If you find one you'll have enough beer tokens to be drunk for a month... ;)

-- Richard
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Offline AndyRCM

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Re: Wanted: DreamCast part
« Reply #3 on: July 21, 2011, 08:55:24 AM »
If not, I think I can sort you out Richard . . . :)

A
"I could see the faces of those who led pissing themselves laughing" - Funeral Pyre by The Jam

Offline rewind

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Re: Wanted: DreamCast part
« Reply #4 on: July 21, 2011, 03:04:23 PM »
I'm sure I can assist *glances over at stack of deadcasts*
presume you dont have one yet?
Is it SMD? I don't do SMD...
All sorts of retro related stuff: http://retro-blog.co.uk
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Offline porchy

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Re: Wanted: DreamCast part
« Reply #5 on: July 21, 2011, 04:08:05 PM »
ive got one knackered one somewhere.
how the f**k does a person lose a box of dreamcasts?

Offline Phu

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Re: Wanted: DreamCast part
« Reply #6 on: July 21, 2011, 04:59:19 PM »
Yes its an SMD part... but I can accept a TH part if its the pin and function compatible.

Its only an SOIC16, so its not hard to remove. One method is a hot air gun, another is a soldering iron and a pin (of the crafts variety) to lift the pins (of the electronics variety).

-- Richard
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Offline porchy

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Re: Wanted: DreamCast part
« Reply #7 on: July 21, 2011, 06:36:44 PM »
its an SOIC14 from my dreamcast though, this what you want, its IC303
« Last Edit: July 21, 2011, 06:42:46 PM by porchy »

Offline Phu

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Re: Wanted: DreamCast part
« Reply #8 on: July 21, 2011, 08:01:06 PM »
SOIC14, yes thats what I said.. *cough*.

(yes I meant to say 14-pin part :P)

If you can send that to me you'll be in beer credits forever :)

-- Richard
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Offline porchy

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Re: Wanted: DreamCast part
« Reply #9 on: July 21, 2011, 08:03:06 PM »
I'll post it tomorrow mate

Offline Panther

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Re: Wanted: DreamCast part
« Reply #10 on: July 22, 2011, 12:35:59 AM »
Hooray, Phu's buying the beer  ;D

Offline porchy

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Re: Wanted: DreamCast part
« Reply #11 on: July 22, 2011, 08:36:26 AM »
Hooray, Phu's buying the beer  ;D
and forever too  :)

Offline AndyRCM

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Re: Wanted: DreamCast part
« Reply #12 on: July 22, 2011, 08:39:06 AM »
Hooray, Phu's buying the beer  ;D
and forever too  :)
and as we all know . . . forever is a long time . . . :)
"I could see the faces of those who led pissing themselves laughing" - Funeral Pyre by The Jam

Offline porchy

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Re: Wanted: DreamCast part
« Reply #13 on: July 22, 2011, 12:32:24 PM »
should be with you tomorrow Richard

Offline Phu

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Re: Wanted: DreamCast part
« Reply #14 on: July 22, 2011, 12:53:39 PM »
Thanks muchly good Sir :)

But I doubt it'll be here tomorrow. The Royal Snail is notoriously slow in Portsmouth. If first class mail arrives in less than 2 days, it's considered a miracle.

-- Richard
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