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- From: nathan@laplace.csb.yale.edu
- Newsgroups: comp.sys.next.announce
- Subject: NeXT-Hardware-RAM-FAQ
- Followup-To: comp.sys.next.misc
- Date: 6 Mar 1995 08:39:18 GMT
- Approved: nathan@laplace.csb.yale.edu
- Expires: Fri, 7 Apr 1995 00:00:00 GMT
- Reply-To: nathan@laplace.csb.yale.edu
- Summary: Frequently Asked Questions about NEXTSTEP and NeXT machines.
- Originator: nathan@laplace
-
- Archive-name: NeXT-Hardware-RAM-FAQ
- Last-modified: Mon Mar 6 03:03:59 EST 1995
- Version: 3.1
-
-
- These FAQs are under significant construction,
- and may well change form and content over the
- next weeks.
-
- These FAQs focus on various aspects of OpenStep,
- NEXTSTEP, and NeXT machines.
-
- The FAQs are kept on-line at several ftp sites,
- including:
-
- cs.orst.edu
- sonata.cc.purdue.edu
-
- Many FAQs, including these, are available (www, ftp,
- email) on the archive site rtfm.mit.edu in the
- directory pub/usenet/news.answers. The name under
- which this FAQ is archived appears in the
- Archive-nameline above.
-
- Within each section each question will be preceded by
- a "Subject:" field, allowing news readers to break up
- the file into separate questions. Each question has
- its own unique number. Items that appear within
- sections are not in any particular order, and get added
- and removed over time. Questions marked with a "+"
- are new to this issue, and questions with changes since
- the last issue are marked by a "!".
-
- Submissions, corrections, comments, input, etc.,
- should be directed to Nathan Janette
- <nathan@laplace.csb.yale.edu>.
-
- Some important NEXTSTEP & OpenStep Information WWW sites:
-
- NeXT, Inc.
- http://www.next.com/
-
- NeXTanswers
- http://www.next.com/NeXTanswers/
-
- Stepwise NEXTSTEP/OpenStep Information Server
- http://digifix.digifix.com/
-
-
- TABLE OF CONTENTS:
- ------------------
-
- N1.What type of memory may be installed in a NeXT?
- N2.What is the NeXT SIMM tool?
- N3.Where can I purchase memory for a NeXT?
-
- ____________________________________________________________________________
-
- Subject: N1. What type of memory may be installed in a NeXT?
-
- "Announcing NeXTstation Turbo and NeXTcube Turbo"
-
-
- NeXT Computer (68030-25MHz/68040-25MHz),
- NeXTcube (68040-25MHz):
-
- Number SIMM slots: 16
- SIMM group size: 4
- SIMM type: 30-pin low profile
- SIMM access rating: 100 ns
- SIMM capacity: 1, 4 MB (1x8/1x9, 4x8/4x9)
- Maximum RAM: 64 MB
-
- The low-profile vertically mounted 4 MB SIMMs are easier to install in
- the NeXTcube than the horizontally mounted 4 MB SIMMs because of the
- small height clearance above the SIMM slots. It is possible to install
- the horizontally mounted 4 MB SIMMs, but you will be required to slide
- the CPU board and the center tower in simultaneously.
-
- Parity (9-bit) SIMMs can be used in both 68030 and 68040 NeXT machines,
- but should not be mixed with non-parity SIMMs. Only 68040 boards with
- ROM levels of 2.2 (v63) and higher can use the parity memory to detect
- parity errors.
-
- [One user adds the following unverified claims:]
-
- It is OK to mix parity and non-parity memory, but the system will not
- boot unattended. Cubes with early boot ROMs will not work with 4 Mb
- parity ram, unless at least 3 banks are used. The system gives an
- exception error on power up. The fix is to get a new boot rom from Next.
- You can pay $30, or you may be able to squawk and get one for free. I
- have found Next to be pretty responsive, once I find the right person.
-
- [Jimmie Quan, NeXT Hardware Service, adds:]
-
- The correct version is v66 which was the last or final rev for this series
- of 040 boards. This version also fixed the problem in the second paragraph.
-
-
- NeXTdimension boards (i860):
-
- Number SIMM slots: 8
- SIMM group size: 4
- SIMM type: 72-pin
- SIMM access rating: 80 ns
- SIMM capacity: 1, 4, 8 MB (256Kx32, 1Mx32, 2Mx32)
- Maximum RAM: 64 MB (32 MB official NeXT)
-
- NeXT didn't officially bless the use of 8 MB SIMMs, but they seem to
- fit and work.
-
-
- NeXTstations (68040-25MHz) serial numbers below ABB 002 6300:
-
- Number SIMM slots: 8
- SIMM group size: 4
- SIMM type: 30-pin
- SIMM access rating: 100 ns
- SIMM capacity: 1, 4 MB (1x8/1x9, 4x8/4x9)
- Maximum RAM: 32 MB
-
- Faster SIMMS (70/80 ns) don't make the memory system work any
- faster than the 100 ns units.
-
-
- NeXTstation Color (68040-25MHz):
-
- Number SIMM slots: 8
- SIMM group size: 2
- SIMM type: 72-pin
- SIMM access rating: 80 ns
- SIMM capacity: 1, 4 MB (256Kx32/256Kx36, 1Mx32/1Mx36)
- Maximum RAM: 32 MB
-
-
- NeXTcube Turbo (68040-33MHz),
- NeXTstation Turbo (68040-33MHz),
- NeXTstation Color Turbo (68040-33MHz),
- NeXTstations (68040-25MHz) serial numbers above ABB 002 6300:
-
- Number SIMM slots: 4
- SIMM group size: 2
- SIMM type: 72-pin
- SIMM access rating: 70/100 ns
- SIMM capacity: 1, 4 ,8, 16, 32 MB (256Kx32/256Kx36, 1Mx32/1Mx36)
- Maximum RAM: 128 MB
-
- For maximum performance use 70 ns SIMMs: SIMMs rated at 80 or 100 ns will
- be detected upon powerup and the memory system clock slowed to 100 ns.
-
- NeXT manufacturing introduced the new 25 MHz NeXTstation CPU board
- into production in late June '92. To verify which SIMM type your machine
- uses, check the system's memory configuration. You can do this by using
- the ROM monitor)s print memory configuration command m. Start with
- your machine powered down. Press the Power key to power on. As soon as the
- message *Testing system...: disappears, press
- command-command-tilde (~ on the numeric keyboard). Under these
- circumstances, this will access the ROM monitor. In the ROM monitor,
- type m and press return. Turbo-designed boardsPincluding new 25 MHz
- NeXTstations and all Turbo systemsPwill return messages reporting
- the memory configuration contained in four sockets (sockets 0 -3); old
- 25 MHz boards will return messages for more than four sockets (usually
- 8). You can tell a Turbo-designed board, and the accompanying 72 pin, 70
- nanosecond SIMMs, by the fact it only reports information for only four
- sockets.
-
- [John Graves, Hardware Engineering, NeXT Computer, Inc. adds]
-
- The memory system has programmable memory timing such that the number
- of processor clocks needed to access a given amount of data can be
- tailored to the speed of the memory installed. 70 ns memory is just
- enough faster than 80 ns memory to allow the cpu to access the data with
- fewer clock cycles. This improves memory system performance.
-
- "70 ns" memory is faster than "80 ns" memory in many parameters other
- than just RAS access time. The faster CAS access time in particular
- allows the memory system to respond quicker to burst (16 bytes) bus
- transfers.
-
- ____________________________________________________________________________
-
- Subject: N2. What is the NeXT SIMM tool?
-
- The tool came with 68040 upgrade kits for NeXTcubes.
-
- It really makes removing SIMMs easy. It looks like a dental tool: about
- six inches long with a 1/2" long head offset at 90 degrees. To remove
- SIMMs, you slip the head into the hole on one side of the SIMM, rest the
- head on the SIMM socket next to the SIMM you are pulling, and pivot the
- tool back, using the simple fulcrum to gently pry the SIMM up about 1/8"
- from the socket on that side. Repeat on the other side, and the SIMM can be
- then removed by hand.
-
- ____________________________________________________________________________
-
- Subject: N3. Where can I purchase memory for a NeXT?
-
- This list contains only a few vendors; prices listed may change and are
- provided as examples only.
-
- There is significant day-to-day fluctuation in prices, especially
- since the destruction of a factory in Japan in July that manufactured
- resin used in chips. Prices are currently very high.
-
-
- First Tech Stratum Technologies
- Austin, TX
- 800-533-1744
- 512-258-3570
- 512-258-3689 (fax)
-
- [Prices current as of 16-Nov-94]
-
- 30 Pin SIMMs
- 1x8-70ns 1 Mb SIMM$ 36
- 4x8-70ns 4 Mb SIMM$ 127
-
- 1x9-70ns 1 Mb SIMM$ 39.50
- 4x9-70ns 4 Mb SIMM$ 141
-
- 72 Pin SIMMs
- 1x32-70ns 4 Mb SIMM$ 148
- 2x32-70ns 8 Mb SIMM$ 294
- 4x32-70ns16 Mb SIMM$ 479 (non-composite)
- 4x32-70ns16 Mb SIMM$ 504 (composite)
-
- 1x36-70ns 4 Mb SIMM$ 166
- 2x36-70ns 8 Mb SIMM$ 334
- 4x36-70ns16 Mb SIMM$ 549 (non-composite)
- 4x36-70ns16 Mb SIMM$ 567 (composite)
-
- Lifetime Warranty.
-
-
- Marco International
-
- 800-621-4668 (Within US/Canada)
- 303-449-9191
- 800 447 8448 (CT Office)
-
- [Prices current as of 21-Jul-94]
-
- 30 Pin SIMMs
- 1x8-70ns 1 Mb SIMM$ 38.50
- 4x8-70ns 4 Mb SIMM$ 129
- 1x9-70ns 1 Mb SIMM$ 40.50
- 4x9-70ns 4 Mb SIMM$ 157
-
- 72 Pin SIMMs
- 1x32-70ns 4 Mb SIMM$ 148
- 1x36-70ns 4 Mb SIMM$ 171
- 2x32-70ns 8 Mb SIMM$ 295
- 2x36-70ns 8 Mb SIMM$ 345
- 4x32-70ns16 Mb SIMM$ 585 (non-composite)
- 4x36-70ns16 Mb SIMM$ 645 (composite)
- 8x32-70ns32 Mb SIMM$1250
- 8x36-70ns32 Mb SIMM$1410
-
- Lifetime Warranty, toll-free support, 24hr RMA.
- "NeXT certified".
-
-
- Chip Merchant
- 9541 Ridgehaven Court
- San Diego, CA 92123
- (800) 426-6375
-
- South Coast Electronics
- Tustin, CA
- (800) 289-8801
- 714-669-9503
-
-
- Impediment
-
- (617) 837-8877
-
- ____________________________________________________________________________
-
- Editor: nathan@laplace.csb.yale.edu
- --
- Nathan Janette
- Systems Manager, Axel T. Brvnger Lab
-
- Internet:nathan@laplace.csb.yale.edu
- ----------------------------------------------------------------
-