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-   -   VRAM - is there a way to test which capacity those sticks have? (http://forums.macnn.com/64/classic-macs-and-mac-os/498523/vram-there-way-test-capacity-those/)

 
euphras Mar 1, 2013 09:30 AM
VRAM - is there a way to test which capacity those sticks have?
I have some of the late eighties/early nineties VRAM memory sticks lying around here, which i rescued from dumped LC/LCII/LC475 years ago. I´m now wondering how i can identify/check the actual capacity of those sticks either from imprinted specs or using a classic Mac and some kind of evaluation utility that reads out the capacity in kB?

Of course i checked Google first but i was unable to find anything substantial.


search terms: Video RAM, DRAM, SGRAM,
 
P Mar 1, 2013 10:01 AM
You can figure it out from the text on the chips, usually. They would all be 256KB or 512KB, which narrows it down.
 
euphras Mar 2, 2013 05:11 PM
Thanks for the answer! So in the case of the depicted sticks below it would be 4 x 256 kB = 1024 kB which equals 1 MB?!

http://farm9.staticflickr.com/8381/8...e9dc5882_b.jpg
 
P Mar 5, 2013 06:58 AM
Actually the number is usually in bits rather than bytes, but that would make it 128 KB, which seems too low. Probably it's a 1 MB.
 
shifuimam Mar 5, 2013 10:20 AM
I had the same problem with a huge stack of 30-pin SIMMs.

Easiest thing to do is just Google the part number on the chips on each stick of RAM. You can generally find a datasheet or something that will tell you the capacity of each chip...then you just have to use math (gasp!) to figure out the capacity of the stick of RAM.
 
reader50 Mar 5, 2013 03:07 PM
Quote, Originally Posted by euphras (Post 4219711)
... how i can identify/check the actual capacity ... using a classic Mac and some kind of evaluation utility that reads out the capacity in kB?
Plug them in, then use an obscure utility called "Apple System Profiler". It's available from System 7.6 onwards in the Apple menu.

Google is faster, but the Utility question was too good to pass up. :)
 
euphras Mar 5, 2013 03:51 PM
Quote, Originally Posted by reader50 (Post 4220278)
Plug them in, then use an obscure utility called "Apple System Profiler". It's available from System 7.6 onwards in the Apple menu.

Google is faster, but the Utility question was too good to pass up. :)
Glad, i didn´t miss anything. The two particular machines are running system 7.1 and 7.5. ;)
 
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