C103253 REV.5 - STFM 1MB Upgrade

Post by **rubber_jonnie** » Sat May 11, 2019 12:27 pm

PhilC wrote: ↑
Sat May 11, 2019 11:58 am
If you struggle finding one RJ, I can probably post you one but probably wouldn't be till next weekend.

Appreciate the offer, I have just found one with a needle, though it has silver conductive paint in it atm, which I am kind of reluctant to just throw away. Also, I'd be concerned that I hadn't got all the paint remains out and it had contaminated the paste.

I'll have a delve online, see what I can get, and I'll let you know if I'm struggling to find any. As long as I can get a syringe, the needle I have should be ok.

Just out of curiosity, what diameter needle are you using?

Post by **PhilC** » Sat May 11, 2019 12:34 pm

rubber_jonnie wrote: ↑
Sat May 11, 2019 12:27 pm

Just out of curiosity, what diameter needle are you using?

Probably about 0.75mm, so it's a pain to use but works well nonetheless.

https://www.youtube.com/user/exxosuk · Post by **exxos** » Sat May 11, 2019 1:30 pm

viewtopic.php?f=6&t=45&p=17212#p17212

Post by **rubber_jonnie** » Sat May 11, 2019 1:56 pm

Cool, I did watch a similar video. I have syringes on the way for the paste, and I am confident that I can do it without burning the board at least! The most difficult part is going to be alignment of the chips I think. I will think about making a jig, perhaps 3d printed.

Post by **rubber_jonnie** » Mon May 20, 2019 10:23 am

Ok, so I have everything I need now, and the board will now not work with its original CPU!

PAK works though, so fingers crossed I can start to add in the new RAM and at least test with the PAK installed rather then the 68K.

Why are these things never easy!

Post by **rubber_jonnie** » Thu May 23, 2019 12:16 pm

Right, finally the boards up and running with a normal CPU, so this job is back on, hopefully I can get on it over the weekend since it's a bank holiday.

Weirdly it now works with a CPU from a CO70789 board that it didn't work with before. All these CPU shenanigans are just insane.

https://www.youtube.com/user/exxosuk · Post by **exxos** » Thu May 23, 2019 1:27 pm

rubber_jonnie wrote: ↑
Thu May 23, 2019 12:16 pm
Weirdly it now works with a CPU from a CO70789 board that it didn't work with before. All these CPU shenanigans are just insane.

Welcome to my world

Post by **rubber_jonnie** » Thu May 23, 2019 1:41 pm

exxos wrote: ↑
Thu May 23, 2019 1:27 pm

rubber_jonnie wrote: ↑
Thu May 23, 2019 12:16 pm
Weirdly it now works with a CPU from a CO70789 board that it didn't work with before. All these CPU shenanigans are just insane.
Welcome to my world

I know we've had these conversations a few times now, but I am quite honestly surprised that any of your boosters have worked under these conditions. Frankly you're a miracle worker.

Post by **rubber_jonnie** » Mon Jun 10, 2019 1:27 pm

Ok, so I went to try and have a go at this over the weekend, and am no further ahead!!

I think the solder paste I have is a bit too thick for the bore of needle I'm using. Either that or the small syringe I have just can't apply enough pressure to the paste.

Having a rethink on how I'm going to do this now, as it really shouldn't be this hard to do!!

Post by **PhilC** » Mon Jun 10, 2019 6:17 pm

Yeah I've had the problem, it is hard to get the solder paste moving. I never seal the tube, so always have to clear the old harder stuff out first.

C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade

Re: C103253 REV.5 - STFM 1MB Upgrade