Amiga.org
Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Retrofan on March 26, 2010, 10:31:51 PM
-
I open this thread because I was wondering about desolder the simm memory socket of the Blizzard 1260 and solder the other side a mirrored one to have enough space...
Someone has done it?
I found this page that talks about back model simms sockets:
http://www.homestead-products.com/simtree.htm
What do you think?
Any other suggestion?
-
Forget that page. They have tell me they don't have them... but perhaps somebody has?
-
Thinking well, it hasn't has to be so difficult. I could desolder it and solder to the other side (would be better to put one with an angle). You'll could put the memory with the outside looking into.
The only modification would have to be the outgoing plastic cap that makes only possible to put the memory one way, that should have to be cutted and glued the other side...the left instead of the right.
Don't you agree?
-
Hum... and the keyboard will not fit anymore, Retrofan !
-
Wouldn't it be more simple to find a SIMM that fits?
-
It won't touch the keyboard I believe, but would have to take measurements. I could put the socket flat or with an angle.
Have you seen the Hawk ramboard?
I upload a photo.
Is exactly what I'm talking, with the simm socket inside the Amiga.
The thing is that it isn't a problem with the 16 mb memory, but I have just bought a 128 mb one (still haven't received it). I have heard people uses to remove the trapdoor because the memory won't fit with it on.
Still have to receive the memory. Although it has double sided chips, they are tsop ones, who are the thinniest, so I'm not sure if I will have the same problems.
I have heard of other people that although can put the trapdoor, they talk about too much heat given from the memory to the 68060.
This is what Amigadave told me:
"Unless you can get a double sided simm that uses extremely thin chips, it will not fit in the Blizzard 1260, unless your 1260's simm socket is different than mine, which holds my simm flat against the 68060 CPU.
I do not try to close the A1200's trap door cover on my A1200 so I have considered putting some 1/4 inch feet at each corner of the bottom of the A1200 case to raise it off the desk and having someone remove my flat simm socket and replace it with an angled simm socket on my Blizzard 1260 card so my simm module will no longer be resting against my 68060. That would allow me room to install a thin heatsink on the 68060 to keep it cooler and remove the heat from the 68060 transferring to the RAM chips. "
I have to see first if that's my case with the new memory. I don't like to have the trapdoor removed.
-
Thinking well, it hasn't has to be so difficult. I could desolder it and solder to the other side (would be better to put one with an angle).
The socket pins are staggered in a way that means they won't physically align with the holes on the reserse side of the board. I've not seen any sockets available recently which will suit what you want to do, but mirroring the existing socket will not mechanically work. Draw it out on a piece of paper to test the theory.
I'd agree with the other comments that it would surely be better to find a SIMM that fits!
-
Oh, yes, that's true, they are made a way (they aren't exactly one over other; the one up is placed to the right looking the back side of the blizzard) I coudn't solder it the other side. I must find a socket made back side. But I've heard they exist, at
http://www.homestead-products.com/simtree.htm they talk about back side simm sockets (but they don't have).
So, the Hack ram board already has a back side simm socket?
No, it has the design made to fit a normal socket the other side...
-
Edit: What Castellen said is what I was trying to say.
If your 128mb RAM simm uses the thinnest tsop chips it should fit your Blizzard, but as I wrote, it will fit right against the 68060 CPU preventing the use of any kind of heat sink on the CPU and transferring heat from the CPU to the RAM chips (which may or may not make any difference).
-
I was thinking about that (answer to Castellen), but I never have seen the SCSI controller module to put another memory simm (sorry to tell that), so I don't know where it goes.
Does anybody have a photo of the blizzard scsi-kit IV mounted?
I mean, if it fits inside perhaps you could install it with the memory at the back side too?
-
This is the memory simm I've bought. I asked to send the one in the center:
-
Where to buy angled 90° simms sockets ?
-
I was thinking about that (answer to Castellen), but I never have seen the SCSI controller module to put another memory simm (sorry to tell that), so I don't know where it goes.
Does anybody have a photo of the blizzard scsi-kit IV mounted?
I mean, if it fits inside perhaps you could install it with the memory at the back side too?
I've found these photo's online showing the SCSI IV Kit mounted:
http://www.flickr.com/photos/15231578@N00/488136058 (http://www.flickr.com/photos/15231578@N00/488136058)
And here's the user manual for the SCSI IV Kit:
http://amiga.resource.cx/manual/BlizzardSCSI4.pdf (http://amiga.resource.cx/manual/BlizzardSCSI4.pdf)
So basically the SCSI IV Kit fits nicely just under the keyboard of the 1200.
You could install a 128MB double sided simm on the scsi kit, and a single sided one on the Blizzard (if you could find one, then 256MB RAM is possible).
-
Thanks for the photo. What I see there is that the rear part of the memory socket of the blizzard keeps above the SCSI kit, so with a mirrored angled simm soldered at the rear part, it could be possible to install both.
Added later:
Sorry, no, I should have to choose one or the other. An angled simm there coudn't fit because of the keyboard. In the Hawk ramboard it's at the center, so it has more room. In the Blizzard I could only put the same kind of simm connector, so woudn't be possible to put the SCSI kit.
-
iv been working on my own simms for some while and all my fastest simms has some kind of modification done on the card. but what i think is needed here is to remove the the simm socket alltogether and replace it with a PCB which has max and fastest dram ( 40ns or faster ) chips so that overclocking can be done.
the PCB should mounted as near as possilble to the simm soldering contacts via 72 pins to make it a drop-in replacement for the old simm socket. i think there is a market for this type of modifcation for A1200 accelerators,as it's not easy finding the right simm.
A1200 PSU
the same can be done to the A1200 motherboard,remove the RF filters and and maybe the RF video output and replace it with a PSU PCB 12v input. the PCB should also replace the old amiga PSU socket. NOTE: there are some extra hole already there on the A1200 motherboard which can be used to hold the PCB and provide power the motherboard.
if you are very good you can build your own PSU direct to the A1200 motherboard in this area.
*** ALL MODIFICATION AT YOUR OWN RISK ***
-
Hello:
So worried for nothing... Apart of that it only has taked 4 days to come from USA to the Canary Islands, it's the thinniest and shorter memory simm I've seen with 128 mb.
Look at the photos. The 128mb is the one atached to the Blizzard 1260, and the one below is a 16mb one. They are almost the same...!
Still I'm not going to put it, because first want to receive the floppy drive and to run it with the other (Hawk ram board), but I believe I will close the trapdoor without problems, don't you think?
-
Finally I tried to put the blizzard with the 128 memory simm, and although the trapdoor closes, it was very tight, so I did some modifications to it. The memory needs around 2 mm more, so as the plastic of the trapdoor is very thick, I cutted a rectangle that fits the measurements of the memory simm and cutted an speaker grill to fit the hole. Later I covered the grill with a resin to avoid electric shorts.
Now the trapdoor closes right, without pressure, and it will be cooler even.
What do you think, Amigadave (and others)?
Here are a couple of photos of the trapdoor: