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"modchip" Schematic


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#1 InfernO8

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Posted 14 March 2008 - 05:10 PM

Hey I posted this question in another thread but I hadn't realized this part of the forum didn't get much activity (anymore at least). Basically I am wondering if anyone out there knows of any schematics out there with a pretty basic modchip design.. something like a DuoX2 or an Aladdin, or just a home made device is just as good. Thanks.

#2 HD10291

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Posted 01 May 2008 - 04:16 AM

Try here

But good luck getting that blank SST49LF020 I couldn't find it anywhere.

I'm sure you could buy it somewhere, but idk if you can just get the stand alone chip. I know you could get all the other supplies easily. Post if you can find that memory chip.


#3 ldotsfan

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Posted 01 May 2008 - 04:22 AM

http://atemybrains.c...e/cheapmod.html

networkBoy also has something like this:
http://xbx.networkbo...mod/index.shtml

But the SST49LF020 is very hard to get your hands on.

#4 lordvader129

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Posted 01 May 2008 - 06:40 PM

http://dwl.xbox-scen...ghtmoddiags.zip

http://forums.xbox-s...howtopic=250154

but yeah, SST49LF020 is rare, it was discontinued pretty much because you could do this with it, lol

#5 HD10291

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Posted 01 May 2008 - 11:45 PM

I found this here

But the minimun you can buy is 300$'s worth. Which would be like 200 of those little chips.


#6 HD10291

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Posted 02 May 2008 - 04:30 AM

Hmm... Does it have to be a SST49LF020, I looked at some of my mod chips, and they have different numbers on them. Couldn't I just use and 256k chip, asuming I could get one?


#7 ldotsfan

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Posted 02 May 2008 - 03:19 PM

I think the later designs added more components in the PCB design and hence can use for example the SST49LF020A.

But for the cheapmod, my belief is you can only use SST49LF020 and the reason is it was a bug in that chip not a feature that allowed it to be used as an alternative xbox BIOS.

#8 HD10291

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Posted 03 May 2008 - 06:15 PM

I really wanna find this chip, or an alternative way to making my own mod chip.

#9 ldotsfan

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Posted 04 May 2008 - 01:14 AM

I did a quick search on ebay and was quite surprised somebody was actually selling the chips but his rating isn't fantastic. You only need to buy 10 pieces. Caveat: I've never dealed with him. Anyway I think the same chip was used as a BIOS chip for some PC motherboards - so that's another possible source.

You will also need the programmer to flash a blank 49LF020.


#10 lordvader129

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Posted 04 May 2008 - 04:14 AM

QUOTE(ldotsfan @ May 3 2008, 04:50 PM) View Post

You will also need the programmer to flash a blank 49LF020.

not necessarily, if you have a modchip with a socketed chip or you plan on using pinheaders you can hotswap to flash them (ive done this before)

Edited by lordvader129, 04 May 2008 - 04:14 AM.


#11 ldotsfan

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Posted 04 May 2008 - 05:00 AM

QUOTE(lordvader129 @ May 4 2008, 11:50 AM) View Post

not necessarily, if you have a modchip with a socketed chip or you plan on using pinheaders you can hotswap to flash them (ive done this before)


Just to clarify, a softmodded xbox won't be able to flash a blank SST49LF020 on the cheapmod connected via LPC, right?

#12 HD10291

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Posted 04 May 2008 - 05:20 AM

I was actually going to plan on buying 300$ of these little buggers and selling them off. Although I first need to get the money, but before that I need a job, and before that I need to apply for places. Except I doubt they'd sell them to me 4-5$ea, and I was planning on hotswapping them =P

#13 lordvader129

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Posted 04 May 2008 - 06:47 AM

QUOTE(ldotsfan @ May 3 2008, 08:36 PM) View Post

Just to clarify, a softmodded xbox won't be able to flash a blank SST49LF020 on the cheapmod connected via LPC, right?

no, ditto for a TSOP'd box

#14 obcd

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Posted 05 May 2008 - 09:14 PM

Hi,

The SST49LF020 is a flashrom with an integrated LPC interface. That's why you only need that chip to make a cheapmod.
Other modchips use a normal flashrom and integrate the LPC interface in a PLD chip (programmable logic design)

The SST49LF020 chip was designed to be used as bios chips in 386 pc's. Once those became absolete, the chip was no longer fabricated as well.

You can create a programmer for them that connects to a pc legacy printer port. I just can't locate the weblink anymore. It has been closed for legacy reasons.

regards.

#15 ldotsfan

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Posted 06 May 2008 - 02:20 PM

QUOTE(obcd @ May 6 2008, 04:50 AM) View Post


You can create a programmer for them that connects to a pc legacy printer port. I just can't locate the weblink anymore. It has been closed for legacy reasons.


Both my post and lordvader's post have links to the programmer's design. Here's another one hosted on xbox-scene: http://rex.xbox-scen...-Rev1/LPC2.html. There are a few alternative designs actually.




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