[E3-hacking] JTAG/Anyone got a broken E3?
mnemonic at onetel.net
Thu May 4 23:35:42 BST 2006
There is another way. I have previously attempted XRAY with limited
results. I'll look at what I got to see if there is any correlation with
----- Original Message -----
From: "Matt Callow" <mc-lists at tesco.net>
To: "Discussion of the Amstrad E3 emailer hardware/software"
<e3-hacking at earth.li>
Sent: Thursday, May 04, 2006 11:03 AM
Subject: [E3-hacking] JTAG/Anyone got a broken E3?
> I've been trying to find the JTAG pins on the E3 again (with limited
> success). I'm pretty sure I've found TDI and TDO and I can probably
> find nTRST (if it's connected) but finding TCK and TMS is proving more
> TDI and TDO appear as 2 of the 8 pads labeled R40 (see
> I found these by using a multimeter to test connectivity between the
> board pads and the CPU pins. This is possible with TDI, TDO and
> possibly nTRST because they appear at the edge of the CPU BGA (i.e. U17,
> U16 and U15) and I was able to poke a very thin piece of wire between
> the CPU and the board to make contact to those pins, one at a time.
> But TMS and TCK are not at the edge of the BGA, so the same method can't
> be used to find them. It would seem sensible to assume that they appear
> as more of the 8 pads labeled R40, but I've found that 3 appear to be
> connected to Vss, 1 to Vdd and the other 2 are connected together!
> So, I've been looking on the web at how other people find JTAG pins and
> it seems that one way is to remove the CPU with a heat gun and then
> trace the PCB that way (at least that's the way it was found for the
> NSLU2). So, this brings me to the topic of my post: Does anyone have a
> broken E3 that they could remove the CPU from and trace the board?
> I know it seems like a brutal approach, but It's probably the most
> reliable unless anyone else has any better ideas?
> e3-hacking mailing list
> e3-hacking at earth.li
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.385 / Virus Database: 268.5.1/327 - Release Date: 28/04/2006
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.385 / Virus Database: 268.5.1/327 - Release Date: 28/04/2006
More information about the e3-hacking