A number of the better programmers have a RAM test as part of their
operation. You can plug in various dynamic and static devices and
exercise them. It is NOT at the rated speed though.
The only other tester that I know of is a dynamic ram tester made by a
company in Florida called Star-Tec (Star-Tek?). This was being sold for a
while, called the DT-90 here is the info on it. I believe one could
re-work it to do static tests by multiplexing the data lines and general
mucking around. I have the pdf file if anyone would like a copy-the
device uses a couple of PALs that I also have the code for if Robert is
sold out.
> On Wed, 19 Apr 2000 21:32:24 GMT, in rec.games.pinball you wrote:
>
> >For those of you doing repair work I have a few memory
> >testers that you might be interested in. These are the
> >only testers I know of that effectively test DRAM chips.
> >Unlike some of the universal programmers which have simple
> >function tests for DRAM (if they test them at all) these
> >testers will test DRAM chips at rated speeds and can test
> >how they operate when powered under a marginal voltage
> >supply. If you think you have memory problems then this
> >can really help. It allowed me to find several chips that
> >would work ok under normal circumstances but would fail if
> >the voltage was too high or too low. I was able to weed
> >out all the chips that were bad or questionable leaving
> >me with the ones that would work in almost any conditions.
> >
> >The features of the DT-90 RAM Tester:
> >
> >1) The DT-90 can test 64K x 1, 256K x 1, and 1Meg x 1 DRAM's
> >(Dynamic Random Access Memory IC's).
> >
> >2) It can test at "read access times" from 60ns to
200ns.
> >
> >3) Alternate read/write test patterns of "1010" and
"0101"
> >are automatically run to all device addresses.
> >
> >4) Vcc MARGIN tests can be selected allowing read/write
> >function tests to run at three voltage levels.
> >
> >5) A "CYCLE" switch allows continuous testing.
> >
> >6) Test immediately stops upon detecting a read error.
> >
> >7) LED indicators are provided to indicate: TEST RUNNING,
> >TEST SUCCESSFULLY COMPLETED, TEST STOPPED ON ERROR, DRAM
> >Vcc level (HI, LO, or normal 5V).
> >
> >8) 16 & 18 pin "ZIF" Zero Insertion Force test
sockets are
> >provided for DRAM's being tested. A picture of their old
> >ad and a link to the PDF of page one in the documenation.
> >
>
>http://www.robotswanted.com/pictures/dt90.jpg
> >
>
>http://www.robotswanted.com/pictures/dt90.PDF
> >
> >These units were featured in the May 1991 Radio Electronics
> >Magazine. Although they only have sockets for testing 64K,
> >256K, and 1meg DRAM chips I was able to make an adpater for
> >mine that allowed me to test the 4116 chips too. I would
> >expect that it would not be too hard to make adpaters for
> >others as well.
> >
> >These have been discontinued and unavailable for quite some
> >time but I was able to obtain the last of them. I got them
> >since I needed one myself but I thought I would offer the
> >extra's for sale. These are not in a case but they are
> >working units (except where noted). You can put them in a
> >case if you wish. They come with complete instructions and
> >schematics. All that you will need to make them work is a
> >9vdc 300ma adapter for power.
> >
> >$65 - Fully working unit w/docs (couple avaiable)
> >
> >$40 - Working unit (tests 64K & 256K chips) w/docs (1
available)
> >
> >$15 - NEW Blank PCB with Dead unit for parts (Build your own!)
> >
> >If you want one let me know. First come first served.
> >
> >Regards,
> >
> >Robert
> >
> >rdoerr@home.com
>
------------------------------------------------------------
Robert L. Doerr (MCNE, MCSE, A+)
26308 Cubberness
St. Clair Shores, MI 48081
Tel: (810) 777-1313
e-mail: rdoerr@home.com
WEB Site:
http://www.robotswanted.com
"Keeping Personal Robots alive!"
Heathkit HEROS (Jr, 1, & 2000), Androbots, RB5X,
Gemini, HUBOT, Omnibots, MAXX STEELE, etc.
------------------------------------------------------------
At 06:59 AM 24/02/2001, you wrote:
Guys:
In an attempt to build up my arsenal of test equipment, I just picked up an HP
10529A Logic Comparator to test some TTL chips. However, I was wondering what the
easiest (or best) way to check SRAM chips? Something like 24-pin AM9128s...
TIA,
tom