SIMM 32 MB. Wrong size on Amiga with Blizzard?

fc.studio · 25 February 2009, 14:23

I just bought a 32 MB SIMM from e-bay. I installed it on my A1200 with Blizzard 1230/IV and, sigh

, Workbench and SYSinfo report the size of 4 MB Fast RAM only!

I tried the 60ns or 70ns jumper on the Blizzard and size is always 4MB.
I used a MemTest utility to check the SIMM and the tool reports no errors.

I asked to the seller and he answered me that the SIMM is composed by "8 RAM x 4 MB = 32 MB". In my opinion he makes a mistake, but could be possible that my Blizzard doesn't detect the right size?

I enclose a picture. My SIMM is those in the right side.

TheCorfiot · 25 February 2009, 15:20

@fc

It's very possible it is a 4MB SIMM, If it's single sided I would say for sure by the picture.

What do the other SIMMS report with your Blizzard. >4MB ?

TC

alexh · 25 February 2009, 15:31

That picture is useless... it needs to be a close up, in focus so we can read the writing on the tops of the chips and on the SIMMS

Or just tell us what it says.

Are the SIMMS single sided?

fc.studio · 25 February 2009, 19:09

I got one SIMM only, those on the right. At the moment I can't report what is written above it, but I'm sure it is single sided.

meega · 25 February 2009, 20:00

"8 RAM x 4 MB = 32 MB"

Hmm, 8 x 4 M BIT = 32 M BIT = 4 MByte ?

(Each chip being 1M locations of 4bits wide, 2 chips needed per megabyte, 4 sets of 'em giving a 32bit wide data path as required.)

prowler · 26 February 2009, 00:45

Quote:

Originally Posted by meega

"8 RAM x 4 MB = 32 MB"

Hmm, 8 x 4 M BIT = 32 M BIT = 4 MByte ?

(Each chip being 1M locations of 4bits wide, 2 chips needed per megabyte, 4 sets of 'em giving a 32bit wide data path as required.)

Yes, this is almost certainly where the confusion arises. I once bought a Tyan Pentium motherboard with "4 x 32MB memory sticks" which turned out to be 4 x 4MB instead.

4MB, 16MB and 64MB sticks are single-sided; 8MB and 32MB sticks are double-sided.

prowler

Supamax · 26 February 2009, 00:52

Hi fc.studio,

yes, it could definitely be a 4MB SIMM (in this case, DO tell to the seller and open a PayPal case if needed/worth).

What's written on each memory chip?

fc.studio · 26 February 2009, 09:19

I report what is written on the SIMM manufactured by Texas Instruments:

On each memory chip (8x):
TI -70
TMS44400DJ
OCI 4441 DB

On the back side of the SIMM:
TM124BBK32S-70 9448I

@meega
I remember
"B" Upper case means Byte = 8 bit
"b" Lower case means bit
therefore "MB" (what seller wrote) means Mega Byte = 8 x Mega bit

@prowler
Are you really sure 8 and 32 MB sticks have to be ALWAYS Double Sided?
I'm enough sure I had in the past SIMM sticks like these:
4 MB Single Sided
8 MB Single Sided
16 MB Single Side & Double Sided (what I own now)

@Supamax
My payment was euro 5,00 shipping included. It's not a great lost and I'll no open a PayPal case. However I would like the seller confirmed his mistake.

Until now my Blizzard 1230/IV read ALWAYS the correct sizes. But when a SIMM stick doesn't work (with other boards too), it doesn't work 'cause is not detected, it reports errors on memory test tools, or DOES A POSSIBILITY EXIST IT COULD BE DETECTED WITH A WRONG SIZE?

Toni Wilen · 26 February 2009, 09:34

Quote:

Originally Posted by fc.studio

TMS44400DJ

1Mx4bit RAM chip (=4megabit chip)

x 8 chips = 8Mx4bit = 4Mx8bit = 4megabyte SIMM.

fc.studio · 26 February 2009, 09:53

Quote:

Originally Posted by Toni Wilen

1Mx4bit RAM chip (=4megabit chip)

x 8 chips = 8Mx4bit = 4Mx8bit = 4megabyte SIMM.

Perfect Toni. Thanks.

prowler · 26 February 2009, 20:56

Quote:

Originally Posted by fc.studio

@prowler
Are you really sure 8 and 32 MB sticks have to be ALWAYS Double Sided?
I'm enough sure I had in the past SIMM sticks like these:
4 MB Single Sided
8 MB Single Sided
16 MB Single Side & Double Sided (what I own now)

@fc.studio
No, I'm not sure that this is ALWAYS the case, but it has been in my experience up to now.

prowler

25 February 2009, 14:23	#1
fc.studio Cat lover Join Date: May 2004 Location: Italy Age: 54 Posts: 804	SIMM 32 MB. Wrong size on Amiga with Blizzard? I just bought a 32 MB SIMM from e-bay. I installed it on my A1200 with Blizzard 1230/IV and, sigh , Workbench and SYSinfo report the size of 4 MB Fast RAM only! I tried the 60ns or 70ns jumper on the Blizzard and size is always 4MB. I used a MemTest utility to check the SIMM and the tool reports no errors. I asked to the seller and he answered me that the SIMM is composed by "8 RAM x 4 MB = 32 MB". In my opinion he makes a mistake, but could be possible that my Blizzard doesn't detect the right size? I enclose a picture. My SIMM is those in the right side. Attached Thumbnails Last edited by fc.studio; 25 February 2009 at 14:30.

25 February 2009, 20:00	#5
meega Registered User Join Date: Dec 2007 Location: Oooh what a feeling yeaaah dancing on the ceiling Posts: 314	"8 RAM x 4 MB = 32 MB" Hmm, 8 x 4 M BIT = 32 M BIT = 4 MByte ? (Each chip being 1M locations of 4bits wide, 2 chips needed per megabyte, 4 sets of 'em giving a 32bit wide data path as required.) Last edited by meega; 25 February 2009 at 20:08.

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25 February 2009, 15:20	#2
TheCorfiot Amibay Senior Staff Join Date: Feb 2008 Location: Cardiff / Wales Posts: 1,302	@fc It's very possible it is a 4MB SIMM, If it's single sided I would say for sure by the picture. What do the other SIMMS report with your Blizzard. >4MB ? TC

25 February 2009, 15:31	#3
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,354	That picture is useless... it needs to be a close up, in focus so we can read the writing on the tops of the chips and on the SIMMS Or just tell us what it says. Are the SIMMS single sided?

25 February 2009, 19:09	#4
fc.studio Cat lover Join Date: May 2004 Location: Italy Age: 54 Posts: 804	I got one SIMM only, those on the right. At the moment I can't report what is written above it, but I'm sure it is single sided.

26 February 2009, 00:52	#7
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	Hi fc.studio, yes, it could definitely be a 4MB SIMM (in this case, DO tell to the seller and open a PayPal case if needed/worth). What's written on each memory chip?

26 February 2009, 09:19	#8
fc.studio Cat lover Join Date: May 2004 Location: Italy Age: 54 Posts: 804	I report what is written on the SIMM manufactured by Texas Instruments: On each memory chip (8x): TI -70 TMS44400DJ OCI 4441 DB On the back side of the SIMM: TM124BBK32S-70 9448I @meega I remember "B" Upper case means Byte = 8 bit "b" Lower case means bit therefore "MB" (what seller wrote) means Mega Byte = 8 x Mega bit @prowler Are you really sure 8 and 32 MB sticks have to be ALWAYS Double Sided? I'm enough sure I had in the past SIMM sticks like these: 4 MB Single Sided 8 MB Single Sided 16 MB Single Side & Double Sided (what I own now) @Supamax My payment was euro 5,00 shipping included. It's not a great lost and I'll no open a PayPal case. However I would like the seller confirmed his mistake. Until now my Blizzard 1230/IV read ALWAYS the correct sizes. But when a SIMM stick doesn't work (with other boards too), it doesn't work 'cause is not detected, it reports errors on memory test tools, or DOES A POSSIBILITY EXIST IT COULD BE DETECTED WITH A WRONG SIZE?

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