keith@ux.acss.umn.edu (Keith MaloneyHuss) (12/12/89)
Does anyone know where I can find the pin-outs (tab-outs) for a SIMM? I have several 256K SIMMs that I would rather do something with other than make earrings out of them. I tried sci.electronics and the one response I received was a request for a copy of the pin-outs. Thanks. --keith
rieman@boulder.Colorado.EDU (John Rieman) (12/13/89)
Here's a message that came through comp.sys.mac a few months
ago. I assume it's accurate, but I'm no expert. -j
--------
From sunybcs!rutgers!att!alberta!ubc-cs!van-bc!ve7apu!spraggs Fri Mar 31 09:19:48 MST 1989
Article 33061 of comp.sys.mac:
Path: boulder!sunybcs!rutgers!att!alberta!ubc-cs!van-bc!ve7apu!spraggs
>From: spraggs@ve7apu.UUCP ( VE7ADE)
Newsgroups: comp.sys.mac
Subject: Re: SIMM pinout
Message-ID: <296@ve7apu.UUCP>
Date: 30 Mar 89 07:29:16 GMT
References: <25017@amdcad.AMD.COM>
Reply-To: spraggs@ve7apu.UUCP (John Spraggs - VE7ADE)
Organization: Doug Lockhart VE7APU Richmond, B.C.
Lines: 26
This is the pinout for a 1 Meg SIMM. I have shown the assignments for
a 9 bit part for completeness. The ninth chip is missing on a Mac SIMM
so these (*) are NC as well.
A 256k part is NC on A9. I expect a 4 Meg part puts A10 on pin 19 and a
16 Meg one has A11 on pin 24.
X ___
X Vcc CAS DQ1 A0 A1 DQ2 A2 A3 Vss DQ3 A4 A5 DQ4 A6 A7 .. continued in line
X 1 15
X
X _ ___ ___
X .. DQ5 A8 A9 NC DQ6 W Vss DQ7 NC DQ8 Q9 RAS CAS9 D9 Vcc
X 16 * * * 30
Vcc = +5V Vss = ground DQ = Data I/O A = Address
___ ___
CAS = Column Address Strobe RAS = Row Address Strobe
Since the Mac + at least does not pull down D9 or CAS9, by 9 SIMMs
should not be used since these inputs can float through the mid voltage
region. When this happens excessive current flows, causing over heating
and possibly enough noise to corrupt data.
John Spraggsjones@optilink.UUCP (Marvin Jones) (12/14/89)
In article <976@ux.acss.umn.edu>, keith@ux.acss.umn.edu (Keith MaloneyHuss) writes: > Does anyone know where I can find the pin-outs (tab-outs) for a SIMM? > I have several 256K SIMMs that I would rather do something with other than > make earrings out of them. I tried sci.electronics and the one response > I received was a request for a copy of the pin-outs. > Thanks. > > --keith I saw the original posting, but passed it by thinking you would get swamped with responses. Following is a list of the signals for a full 1M x 9 SIMM. The 512K and 256K SIMMs are identical, without the use of the A9 lead. If you are using 8 bit wide SIMMs, the D9 and Q9 leads are unused. Numbering starts (pin 1) at the end of the SIMM with the "notch" or "shoulder". Pin Function --- ----------------- 1 Vdd 2 /CAS 3 DQ1 4 A0 5 A1 6 DQ2 7 A2 8 A3 9 Vss 10 DQ3 11 A4 12 A5 13 DQ4 14 A6 15 A7 16 DQ5 17 A8 18 A9 19 n.c. 20 DQ6 21 /W 22 Vss 23 DQ7 24 /PRD 25 DQ8 26 Q9 27 /RAS 28 /CAS9 29 D9 30 Vdd Note that functions preceeded by "/" indicate negative logic. Pinouts for memory SIPs (with pins instead of fingers) are identical. All information excerpted from the Micron Technology Memory Products brochure dated 8/87. Hope this helps. Good Luck with your project. Let us know what you came up with, since we all have drawers full of these things ;-) Regards, -- Marvin Jones uucp: {pyramid, tekbspa}!optilink!jones Optilink Corp. bell-net: 707-795-9444 X 206 Petaluma, CA CI$: 71320,3637