For sale: Simmdoubler - Use 2 SIMMS on one socket (Perfect for A1200, 4000 etc)

[Phonic]

I used this on my A1200 accelerator which only had one 72 pin SIMM socket, it works perfectly and allowed me to get 64MB from one 72 pin socket.
I'm a stickler for taking antistatic precautions and it will be shipped in proper antistatic packaging.

Pic 1.

Looking for $25 or will trade for anything interesting.

Use maxaltREMOVE@REMOVEgmail.com or PM (Remove "REMOVE")

I'm PayPal verified and take checks or MO.
Genuine refs available.
Local pickup in VA welcome.
Thanks all.

[560SL]

Man, will that work on a CyberstormPPC as well? Really double the space to max 256Mb. If so, thats beautiful!

[Phonic]

I'm not familiar with the Cyberstorm (I wish I was) but I imagine it'll work if it has a 72-pin SIMM socket.

Earlier I tried it on 2 old PC boards and an Apple and it works like a charm on those too.

[X-ray]

@ 560SL

I don't see how it could double the RAM. I was under the impression that the PPC card can only access 128mb, period, regardless of SIMMS/slots.

[humppa]

I doubt that the SIMM doubler can "break the barrier".

SIMM doublers make multiple smaller SIMMs appear as one larger SIMM, that wouldn't change the limit a card can take at maximum.
An Apollo can take a maximum of 32MB in one SIMM socket. You can use the doubler to put two 16MB modules in it, but I doubt you could use it for putting 2x32MB=64MB in one socket since the Apollo accesses the RAM in a custom manner and won't see everything above 32MB.

[PaSha]

AFAIK these things only accept single sided SIMM's (4MB, 16MB, 64MB) and use two of these to mimic a double sided SIMM (8MB, 32MB, 128MB).

Although, I have seen huge (as in twice the height and number of chips) 64MB SIMMs (using the same RAM chips as 32MB SIMMs, just twice as many). So it could maybe work, at least with some boards.

There's only one way to find out: Buy one (two for a CS-PPC) of these and try.

-Paul

[jj]

This is pure speculation, but my blizzard ppc 603e will take up to 256 mb of ram, and so would my blizzard IV , with scsi kit, so I dont think it would be a limit of the card, can you not get 256mb edo ram sticks then?

[PaSha]

JJ wrote:
This is pure speculation, but my blizzard ppc 603e will take up to 256 mb of ram, and so would my blizzard IV , with scsi kit, so I dont think it would be a limit of the card, can you not get 256mb edo ram sticks then?

1: AFAIK there's no such thing as a 256MB SIMM, and if there is, they are probably even rarer than the 128MB ones...

2: The CyberstormPPC has four SIMM sockets, but for some reason, phase5 decided not to bother supporting larger SIMMs than 32MB. 4x32=128.

The original specs for the BlizzardPPC was max 64MB (2x32), but I guess they figured out that this wouldn't be enough, and redesigned the RAM circuitry. The next step in SIMM size limit is 128MB, resulting in a max of 256MB.

Had they done this with the CyberstormPPC as well, the limit would have been 512MB! :insane:

-Paul

[Phonic]

humppa wrote:
An Apollo can take a maximum of 32MB in one SIMM socket. You can use the doubler to put two 16MB modules in it, but I doubt you could use it for putting 2x32MB=64MB in one socket since the Apollo accesses the RAM in a custom manner and won't see everything above 32MB.

That's how I used it, in my Apollo 1230 with 2x32MB sticks (Double sided) and it's fine.

I can take pics if needed.

[alenppc]

The BlizzardPPC supports max 256 megs, but unfortunately the CyberstromPPC supports only 128 so no help there. Still this doubler looks really cool. I wish I could buy some of those. :-)

[dnelsonfl]

humppa wrote:
I doubt that the SIMM doubler can "break the barrier".

Humppa, you're right. It won't break the barrier. I've got a bunch of these things sitting around waiting for the scrap pickup. Leftovers from the old PC days, if you will. Anyhow, a good example was an old Pentium motherboard. I could put several of these stackers in it and load it up with ram, but it would not recognize more than 64MB. Turns out 64MB was the motherboard's address limit.

They were very useful, though, in helping reach those limits using cheaper, smaller simms. I loved 'em.

-David

[PaSha]

Phonic wrote:

That's how I used it, in my Apollo 1230 with 2x32MB sticks (Double sided) and it's fine.

I can take pics if needed.

Which means this thing emulates a 'huge' 64 MB SIMM (the ones with twice the number of chips as 32MB SIMMs).
So, In theory, this could work on a CS-PPC as well. Trouble is, you need two of these (Identical) and four Identical 32 MB SIMMs in order to try.