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Old 24 December 2008, 17:58   #1
tnt23
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Blizzard 1240/1260 and 1200's trapdoor

Those Blizzard cards, they have an angled SIMM socket that won't allow the trapdoor to be closed in 1200. It is also difficult to fit double-sided SIMMs in there, especially when/if the processor has a heatsink and/or a fan attached.

I wonder if this socket can be removed and either soldered from another side of the board (with regard to signals, polarity etc), or even replaced with short piece of flat ribbon cable and same socket on the other end.

Any input is appreciated
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Old 24 December 2008, 19:03   #2
prowler
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Hi tnt23,

I don't see why this can't be done (and you wouldn't be asking this question if you didn't think you had the necessary skills with soldering, etc. )

I have often carried out similar mods on PC motherboards where the SIMMs obstructed the fitting of full-length expansion cards.

But with the A1200 you have the awkward question of space. My best advice would be to remove the offending SIMM socket from the Blizzard pcb, soldering one end of a ribbon cable extension to the vacant holes and refitting the socket to the other end of the cable. Keep the cable as short as possible (the A1200 housing won't allow you much choice) and use sleeves over the SIMM socket pins when connecting the cable. You will also find it *very* useful to fit a SIMM stick (preferably a non-working spare) in the socket while you are removing it/fitting it to the cable to keep the connecting pins from falling out.

Clean residue from the the Blizzard PCB with a stiff brush made by cutting short the bristles of a 12mm paint brush and isopropyl alcohol (IPA) *anything stronger will remove legends, etc. from the pcb surface*.

Inspection of the case, with the Blizzard attached to the motherboard edge-connector will suggest the best place to site the SIMM socket after modification.

Finally, I would suggest that before starting, you check that the SIMM runs sufficiently cool to allow for possible total enclosure with insulating material (e.g. a pocket made from mica sheet). Alternatively, you may be able to fit a heat-sink to the module to achieve this.

Above all, have a good think about *exactly* how you're going to do it before you start.

Best of luck!

prowler

[Edit] I would suggest that there are even more practical difficulties involved in trying the fit the SIMM on the other side of the board, not the least of which is swapping the connections completely about-face. (This would probably also require a ribbon cable to achieve properly in any case.)

Last edited by prowler; 24 December 2008 at 19:16.
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Old 25 December 2008, 14:21   #3
tnt23
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Hi Prowler,

Good tips, thank you.

I remember seeing a picture of an accelerator, don't know if that was Apollo or Blizzard, with another SIMM socket attached on the other side of the board. This, and the fact that my trapdoor won't close, made me wondering of similar hack.

Desoldering an old SIMM socket shouldn't be harder than the old CPU. With decent luck, I believe it is also possible to find the SIMM connector with mirrored pins (or angled differently). Of course, if that fails there are still 72 wires of good old ribbon cable
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Old 25 December 2008, 14:35   #4
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Hi tnt23,

Thanks for the feedback, mate, and good luck - whatever you decide to do.

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Old 25 December 2008, 16:08   #5
AlfaRomeo
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Quote:
Originally Posted by tnt23 View Post
Those Blizzard cards, they have an angled SIMM socket that won't allow the trapdoor to be closed in 1200.
My best advice is that you cut the trapdood around the SIMM and processor like I did to mine as you can see in this thread:

http://eab.abime.net/showthread.php?...highlight=pr0n
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Old 25 December 2008, 16:19   #6
prowler
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Quote:
Originally Posted by AlfaRomeo View Post
My best advice is that you cut the trapdood around the SIMM and processor like I did to mine as you can see in this thread:

http://eab.abime.net/showthread.php?...highlight=pr0n
Thanks, AlfaRomeo!

I knew I had seen these pictures somewhere , but I couldn't recall exactly which thread!

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Old 25 December 2008, 18:14   #7
tnt23
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Quote:
Originally Posted by AlfaRomeo View Post
My best advice is that you cut the trapdood around the SIMM and processor like I did to mine as you can see in this thread:

http://eab.abime.net/showthread.php?...highlight=pr0n
Nice pr0n indeed I am not that good with cutting plastic, so I'll try to save my trapdoor intact if possible.
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