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4mb upgrade possible on this 1040 STFM?
Posted: 21 Oct 2021 16:44
by grinoir
Hi all of you
It saddens me to see that my motherboard don’t provide me with an easy way to upgrade my ram to 4mb.
Is it possible in some way? How?
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Re: 4mb upgrade possible on this 1040 STFM?
Posted: 21 Oct 2021 17:12
by exxos
Yep. But sadly out of stock currently.
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https://www.exxosforum.co.uk/atari/store2/#0020
Re: 4mb upgrade possible on this 1040 STFM?
Posted: 21 Oct 2021 18:46
by rubber_jonnie
You could use one of these:
https://www.exxosforum.co.uk/atari/store2/#0035 or search on eBay for a Marpet RAM/SIMM upgrade for ST.
Re: 4mb upgrade possible on this 1040 STFM?
Posted: 21 Oct 2021 18:51
by exxos
He has SMT MMU - so can't use #0035 or Marpet (yuck!) .
Re: 4mb upgrade possible on this 1040 STFM?
Posted: 21 Oct 2021 19:08
by rubber_jonnie
exxos wrote: 21 Oct 2021 18:51
He has SMT MMU - so can't use #0035 or Marpet (yuck!) .
Oh yeah, well spotted and yuck indeed!!
Re: 4mb upgrade possible on this 1040 STFM?
Posted: 21 Oct 2021 23:24
by grinoir
Thanks exxos,
Will it be back in Stock? If so is there a timeframe?
Is it a hard installation, should I get another computer?
I do not own a desoldering station only a tin sucker.
Re: 4mb upgrade possible on this 1040 STFM?
Posted: 22 Oct 2021 00:29
by exxos
They will be in stock again but not sure when. But it is difficult to fit, so you may want to get someone to fit it for you.
Some more info here
https://www.exxosforum.co.uk/atari/last/4mb/index.htm
Re: 4mb upgrade possible on this 1040 STFM?
Posted: 22 Oct 2021 02:14
by grinoir
Thank you. I think that I can do that. I need this!
I will check back in your store
Thanks
Re: 4mb upgrade possible on this 1040 STFM?
Posted: 22 Oct 2021 15:57
by troed
grinoir wrote: 22 Oct 2021 02:14
Thank you. I think that I can do that. I need this!
Desoldering the old RAM chips is a _lot_ of work. I would be hesitant to do it with just a solder sucker, esp. if you haven't done it a lot already. My first choice is a proper desoldering gun, and the second (much more risky) is a hot air station where you simply lift the ICs up when all the solder has melted. The second trick is fast, but has a non-zero risk of frying the motherboard a bit.
Installing the replacement RAM board once the chips are out and you've cleaned the holes from old solder is relatively easy even with just casual soldering experience and equipment.
Re: 4mb upgrade possible on this 1040 STFM?
Posted: 23 Oct 2021 11:12
by krs
Also worth noting is that on the 80-pin SMD MMU the MAD9 pin is pin 66 instead of pin 64 as on the socketed MMU, and you have to solder the wire directly to the leg of the chip. I'm about to perform this upgrade myself but I'm waiting for a desoldering station that I ordered, because I sure as hell ain't removing 32 16-legged chips with desoldering braid and solder sucker!