64MB SIMMS in LC 550?

[LazarusNine]

Just curious whether or not 64MB SIMMS are recognised on the 550 logic board or if 36MB (4 + 32) truly is the limit. Thanks!

 

[360alaska]

If I'm not mistaken a 550 is basically an LCIII right? And it's max ram is 36mb so...

 

[MJ313]

I am kind of think Charles said that a single sided 64MB SIMM might work in an LCIII... but maybe I dreamt that. Maybe he'll chime in. I know I tried a double sided one in mine and it failed.

 

[uniserver]

yea i think it was trag...  Trag was also the same guy that got 260 megs of ram to work in a quadra 605 if i remember correctly.

and then a little later on i repeated it in some thread.   but i don't think i was ever able to come across a single sided 64 mb simm.

 

[LazarusNine]

Thanks for the feedback! I'll likely stick with the 32MB SIMM in that case. If I've ever got a 64MB chip lying around, I'll test it and post my results.

 

[uniserver]

i'v tried double sided 64 meg simms to no avail…  i tried 3 different 64 megs simms, no dice… but they worked great in the 475/605 so that is where they went.

 

[LazarusNine]

Thanks, uni. I could always get a 64MB SIMM and drop it in one of the 475s and repurpose the 32MB chip for the 550.

 

[trag]

yea i think it was trag... Trag was also the same guy that got 260 megs of ram to work in a quadra 605 if i remember correctly.

I never tested memory in a 550; don't have one.
260 MB in the 605/475 was with a 72 pin SIMM doubler and there was no closing the lid. A single 128 MB SIMM is more practical.

Single sided doesn't mean anything with 64 MB SIMMs except in as much as it might correlate with non-composite and/or single vs. double banked. You pretty much always want non-composite though some old composite SIMMs will work (in some machines) and almost all 64 MB SIMMs are single bank -- all RAS wires/signals common amongst the chips on the SIMM.

 

[LazarusNine]

I never tested memory in a 550; don't have one.

260 MB in the 605/475 was with a 72 pin SIMM doubler and there was no closing the lid. A single 128 MB SIMM is more practical.

Trag, out of curiosity, is there a specific type of 72-pin 128MB SIMM that seems to work better than others in the 475?

 

[uniserver]

http://www.ebay.com/itm/128MB-FPM-MEMORY-NON-PARITY-60NS-SIMM-72-PIN-5V-32X32-/230649540963?hash=item35b3c8b163

I really like buying my ram from these guys.

right now i have 2 of these in my OC'd 6100,  256 megs of ram... sickness...

 

[beachycove]

I have some 64mb ram that will work in an LC575 (and Q605) but not in a 550. Draw your own conclusions!

 

[uniserver]

you have 128 megs of ram in your LC575... if so ... COOL!

oh never mind,  its got 2 simm slots for vram, not ram.  

and.. if i am not mistaken... 128 megs of ram does not work in the LC575.

 

[MJ313]

right now i have 2 of these in my OC'd 6100,  256 megs of ram... sickness...

Could you drop 4 of those in a 650? Or is that where you would also need to add the ROM slot and use a dougg3 rom, bbraun style?

 

[uniserver]

yes you can,, and yes you would need Doug's rom simm and Rob's 650/610/800 rom hack

 

[uniserver]

 

[techknight]

Wow talk about memory leakage. lol. 

 

[LazarusNine]

Impressive stuff there, uni! Thanks for the link to the 128MB SIMM. I may need to find an alternative, though, as their shipping costs (~£25) are a bit steep for me, given that I would need - at most - one or two chips. In any case, I found this, but can't tell if it's double-height. In which case would it fit in the LC475?

http://www.ebay.co.uk/ulk/itm/161053502879

 

[flecom]

I tried putting a several different 64MB SIMM in my LC III, some gave me a sad mac, others would just show up as 32MB (so 36MB total)... I was contemplating getting some different 128MB SIMMs and seeing if any of those could get at least recognized as 1 64MB (so 68MB total)... they are cheap enough on ebay, worst case I'm out $20 I guess

 

[rsolberg]

The LC 575 can accept a 128MB double banked 2k refresh SIMM for a total of 132MB.

See: http://colourclassicfaq.com/mobo/mystic.shtml