Can you use 64mb SIMM's in an Apollo 1260?

Amicol · 03 January 2014, 01:19

Guys the 32mb SIMM in my Apollo 1260 is very thick and Doesn't fit very well. I found a cheap 64mb (thin) SIMM and wondered if it would work in the Apollo?

Will the Apollo use only 32mb of it? Or not work at all?

fitzsteve · 03 January 2014, 01:22

I Don't think it will work.

ShK · 03 January 2014, 01:26

Single sided 72pin SIMMs are: 4, 16, 64MB
Doubled sided units: 1, 8, 32 & 128MB

Apollo sees only 16MB of the 64MB single side module.

Amicol · 03 January 2014, 01:44

Quote:

Originally Posted by ShK

Single sided 72pin SIMMs are: 4, 16, 64MB
Doubled sided units: 1, 8, 32 & 128MB

Apollo sees only 16MB of the 64MB single side module.

Ah, thanks guys. Didn't think they would.....

delshay · 03 January 2014, 01:46

You can get 64Mb double sided thats four chips per side,result will likely be the same as posting above.

Hewitson · 03 January 2014, 07:12

This is the only thing I hate about the Apollo's, what a massive design flaw. I wonder how difficult it would be to modify them to take decent sized memory modules.

Chain · 03 January 2014, 08:30

anyone want to see doublesided 64mb simm?

Chain · 03 January 2014, 08:32

Quote:

Originally Posted by Amicol

I found a cheap 64mb (thin) SIMM and wondered if it would work in the Apollo?

its thin but also wider than space between socket and EPROM. Tried that and it will not "clicks" there :/

demolition · 03 January 2014, 11:21

You might be able to find a thinner 32MB module which only has chips on one side but will still be seen as a double-sided module. There is not always correspondence between a module being single/double sided and whether it has chips on just one side or both, although it is often the case.

hooverphonique · 03 January 2014, 13:22

Quote:

Originally Posted by demolition

You might be able to find a thinner 32MB module which only has chips on one side but will still be seen as a double-sided module. There is not always correspondence between a module being single/double sided and whether it has chips on just one side or both, although it is often the case.

exactly.. that's why 2mb,8mb,32mb,etc modules are technically referred to as "double rank", not double sided.. they are effectively two-in-one modules using separate RAS signals to access one or the other

note that this does not apply in the same way to more modern dimm modules..

Amicol · 03 January 2014, 13:32

Quote:

Originally Posted by demolition

You might be able to find a thinner 32MB module which only has chips on one side but will still be seen as a double-sided module. There is not always correspondence between a module being single/double sided and whether it has chips on just one side or both, although it is often the case.

Good call, finding one is another matter.
The ones on eBay are lacking technical details, so it's hit and miss...

roy bates · 03 January 2014, 16:39

an apollo 1240 and 1260 cant use a 64mb simm because the extra address's are missing on the board.

32 mb double sided edo simms are easy to get.

Nobby_UK · 04 January 2014, 00:34

I fell into that trap (Slim 64 Meg [50 ns] Simms)
Only to find the User Guide too late

03 January 2014, 01:19	#1
Amicol Registered User Join Date: Dec 2013 Location: Hartlepool / England Posts: 389	Can you use 64mb SIMM's in an Apollo 1260? Guys the 32mb SIMM in my Apollo 1260 is very thick and Doesn't fit very well. I found a cheap 64mb (thin) SIMM and wondered if it would work in the Apollo? Will the Apollo use only 32mb of it? Or not work at all?

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03 January 2014, 01:22	#2
fitzsteve Professional slacker! Join Date: Jul 2009 Location: Kent, UK Age: 44 Posts: 6,683	I Don't think it will work.

03 January 2014, 01:26	#3
ShK Registered User Join Date: Mar 2013 Location: Lahti / Finland Age: 52 Posts: 447	Single sided 72pin SIMMs are: 4, 16, 64MB Doubled sided units: 1, 8, 32 & 128MB Apollo sees only 16MB of the 64MB single side module.

03 January 2014, 01:46	#5
delshay Registered User Join Date: Jan 2011 Location: uk Posts: 245	You can get 64Mb double sided thats four chips per side,result will likely be the same as posting above.

03 January 2014, 07:12	#6
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,772	This is the only thing I hate about the Apollo's, what a massive design flaw. I wonder how difficult it would be to modify them to take decent sized memory modules.

03 January 2014, 08:30	#7
Chain A-Collector, repairments Join Date: Jul 2001 Location: Czech Rep. Age: 50 Posts: 1,536	anyone want to see doublesided 64mb simm?

03 January 2014, 11:21	#9
demolition Unregistered User Join Date: Sep 2012 Location: Copenhagen / DK Age: 43 Posts: 4,190	You might be able to find a thinner 32MB module which only has chips on one side but will still be seen as a double-sided module. There is not always correspondence between a module being single/double sided and whether it has chips on just one side or both, although it is often the case.

03 January 2014, 16:39	#12
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 55 Posts: 2,827	an apollo 1240 and 1260 cant use a 64mb simm because the extra address's are missing on the board. 32 mb double sided edo simms are easy to get.

04 January 2014, 00:34	#13
Nobby_UK Registered User Join Date: Jul 2013 Location: Liverpool Posts: 2,595	I fell into that trap (Slim 64 Meg [50 ns] Simms) Only to find the User Guide too late

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