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Logic Analyzers and pulling out what little hair I have left...
by John Robertson 31 Mar '18

31 Mar '18

Well, not that I need one very often - the Fluke 9010A finds 99% of the problems - but right now I have a headache with a Williams F-14 pinball MPU that refuses to produce speech. According to the 9010A everything seems just fine, I can access the PIA, ROM signatures are correct (paged ROM, but pages seem to work correctly). There really is very little hardware - two Eproms, a 6802, 2106 RAM, some logic glue, and a 6821 PIA, but it won't run the speech data. Using my audio probe I don't even get the sounds on D0 so I know the problem is actually before the 6821. Audio probes are fun to use for troubleshooting digital audio as you can even hear the sounds on the logic data bus - weak and fuzzy, but clearly the sounds you are looking for. So, I figure I'd dig up one of my ancient logic analyzers that I bought around 2002 figuring I'd use them some day. Two Arium ML4100s (one deader) and an Arium ML4400. However, can I find them? No. We moved the shop after 35 years last May and my helpful staff buried two of the three Ariums somewhere in the 6,000 sq ft shop...the only one I could find was a dead ML4100. So, now I figure I'd see what was online for modern LAs and there are some interesting 16 bit units including a few from China that should work on the SIGROK software. http://www.qdkingst.com/en The point of this ramble? A question - anyone here using one of these modern inexpensive LAs (or another brand) and cares to tell us your experiences? I guess the other point is, has anyone troubleshot a Williams sound/speech section and can tell me what I have overlooked? I do know (substitution) that RAM/ROM/CPU/PIAs are all good, have replaced the glue chips, but really, they changed state correctly for the Fluke as well as my logic comparator. There is some corrosion on the board, but suspect sockets replaced and while I did have a short from R/W to another line, I did track that down and fix it. All sounds EXCEPT speech work just fine. Gah! Frigging FM. Thanks, John :-#)# -- How to subscribe or unsubscribe from TTL http://seven.pairlist.net/mailman/listinfo/techtoolslist _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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Re: [Techtoolslist] 29B EPROM Programming Woes...
by Jess Askey 31 Mar '18

31 Mar '18

Okay, just a little followup on this for the archives... I took this moment to do several things with my 29B and I have some improvements as a result.... What I did: 1. Replaced all the mainboard Tantalum Caps - these can be identified as they are 'blob' looking and are tannish yellow. I had to replace about 9 of them around the Power Supply and these ranged from 2.2uf to 220uf. Luckily since I re-cap monitors all the time, I had lots of equivalent 105 degree electrolytic caps in my parts to match these. 2. I guessed that the tiny square tannish-yellow 5v bypass capacitors on my mainboard were not Tantalum as they were very small and also pretty high voltage, I didn't think they could possibly be tantalum due to those properties. I might be wrong, but I left them alone (there were also like 10 of them) 3. I went through the Power Supply calibration measurements, it was challenging without an extender card/cable but I was still able to get my DMM probes in there to the test points. Everything in there was pretty good so I did not need to adjust anything. 4. I also took the time while I was in there to upgrade my 256K Expansion Memory board to 1M... I had a set of RAM and sockets that I had ordered years ago, and took the time to do it now * It was tedious and meticulous. The traces are super small but I wouldn't call them fragile by any means but if you aren't pretty good with a soldering iron, I can see how this could become disastrous. * Once you have everything out, inspect your PCB for damage you might have caused and clean it up with Flux cleaner etc... I used a magnifying glass because apparently now Im old and can't see small things anymore, Im not entirely sure when this happened. * The bypass capacitors that need to be moved... they really need to be moved!! I assumed that I could just leave them and throw in some other bypass caps in the new locations.. After booting I was getting a 'Parity Error #62'. However these are not normal bypass caps... they are actually 33uf for being so small. I had to remove all the ones I put in in the new locations and moved the old ones over, just like the instructions said (docs are on the TTL FTP site for this). Then no more parity errors... Whew... Instructions to the rescue! * Select B -2 - Start reported a solid 1M memory after this. After all this, I again started programming a set of EPROM's, both 27128 varieties and 27256 varieties by different manufacturers from my 'old EPROM' bin. I was able to program the SEEQ, ST and TI EPROM's pretty decently, and the ones that failed were all the same old ones that had failed before, so Im concluding that those specific EPROM's might have issues (potentially related to the other programmer I was using)... Im going to stick to the 29B now since it actually has way better and 'specific' support for these part numbers and see how it goes. Conclusions: 1. The capacitor upgrades needed to happen anyway because eventually the tantalum caps will have silver migration issues and start to create a DC load. Even tho my unit was built in 1985 and had all the newest designs, Im sure the caps were less than optimal after 30+ years of environmental stress. 2. I think I was in a 'statistical saddle' on my luck with the old EPROM's... I sorta put my mindset into 10% failure rate might be normal on using old devices. 3. Man TI27CXXX EPROMs program fast (TMS27C256 in 2 seconds) compared to others (sometimes 2+ minutes, the SEEQ's especially), they must have really spent some time getting their programming algorithm tweaked for them. NICE JOB TI! Thanks to everyone for the tips, they were helpful to get my mind in the right place for all of this!! Jess -----Original Message----- Heya Folks... I have had a need to program a bunch of EPROMs lately (27128 varieties) and Im not sure if there are sunspots or something, but I can't seem to program anything on either my 29B OR my Intronics USB Programmer... I have successfully programmed like 4 EPROMs out of like 40 attempts. My EPROM's are old pulls from either Atari boards or other used ones I have acquired over the years in storage sticks. They are either ST 27128A Fujitsu 27128 SEEQ 27128 TI TMS27C128 Im being fairly careful about the programming voltages and the 29B identifies the IC before programming it. On the 29B I just get an Error #22 Programming Error right away. Sorta the same thing on my Intronics.... Set it up, verify blank, program, error right away. Are these just too old? Anyone have any good tricks? The strange part is that I was having this exact same issue last night, then all of a sudden my 29B programmed 3 in a row just fine... today, nothing. Thanks Jess _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com<mailto:Techtoolslist@flippers.com> https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/ _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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DS1287 repair
by Ian Eure 29 Mar '18

29 Mar '18

I've been working on another 9100FT, and like a lot of them, the RTC battery was depleted. I searched around a bit and found a guide to hacking in a button battery holder. Figured I had nothing to lose since it was dead already, so I gave it a try. It's not going to win any awards, but it does work. Seems like a decent alternative if you can't find NOS, don't want to spend what they cost, or want a permanent long-term solution. https://www.classic-computers.org.nz/blog/2009-10-10-renovating-a-dallas-ba… _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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Re: [Techtoolslist] FREE: Fluke 9132A ROM adapters and Fluke manuals
by Tony Jones 28 Mar '18

28 Mar '18

Most of the FREE 9132A hardware was taken (THANKS!) but then I found some more :-) 9132 stuff is truly the gift that keeps on giving. I also have this complete tested working 9132A system on eBay for $300 that I'd sell to a list member for $150+shipping (paypal gift) - https://www.ebay.com/itm/183076021177 -------- Anyways, back to the FREE stuff (just pay shipping) - six 9132A ROM modules (1x 32 pin, 5x 24 pin) - 3 NOS 9132A personality modules for 68020, 68030 and 80386 (the personality and the cpu socket adapter). With manuals. - Second set of manuals for the above personality modules. - 2 copies 9100 Supplemental Pod manual (additional 9100 specific info for each 9000 series pod) - 1 copy creased 80186 manual. Any help getting this stuff out of my closet gratefully appreciated :-) Thanks! > From: Tony Jones tony at tonyjones.com > Date: Sun Mar 4 16:51:35 EST 2018 > Subject: FREE: Fluke 9132A ROM adapters and Fluke manuals > ROM Adapters (new but unboxed) > - 9132A-024 ROM module (qty:5) > - 9132A-028 ROM module (qty:1) > - 9132A-032 ROM module (qty:1) > Manuals: > - Supplementary Pod Information for 9100A/9105A users (qty:3) > - 9132A manual set (3 manuals - 68030, 68020 and 80386) (qry: 2) > - 9132A manual 68020 > - 9132A manual 80386 > - 9100 series, getting started (crease on cover) > - 9000A-80186 interface pod and getting started guide > - 9000A-8048 interface pod > - 9000A-80186 Interface pod (spine creased/worn; corners creased) > - 9000A-1802 Interface Pod (spine creased/worn) > Shipping is media mail for the manuals and USPS 1st class for a single > ROM adapter. Multiple adapters would be Priority Mail. I'm charging > only what USPS charges me. > If you want to take multiples or the entire lot that's fine with me. _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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1Kx4 PROM's anyone...
by Jess Askey 18 Mar '18

18 Mar '18

Hiya folks... I realized that Im suddenly extremely low on 1Kx4 Bipolar PROM's... the 45ns or 35ns versions which are faster for the Mathbox etc... anyone have a large stash of these and willing to sell 50-100 of them at a fair price? Here are all the manufacturers and various part numbers for reference.. 45ns - Tri State ------------------------------------------------------------- NEC uPB426-1 Fujitsu MB7134 Intersil LH5626 Signetics 82S137A Motorola/Harris HM7643A MMI 63S441 National 74S573A 35ns - Tri State ------------------------------------------------------------- NEC uPB426-2 Fujitsu MB7054 Signetics 82S137B Motorola/Harris HM7643B MMI 63S441A National 74S573B AMD 27S33A _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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Fluke 90 - 8085 Micro tester
by John Robertson 05 Mar '18

05 Mar '18

(Not mine!) Handy device if you want something that simply glomps onto an 8085 CPU and does most of the test functions of the 9010A pod: https://www.ebay.com/itm/202249340070 Plus I have converted this device to do the Z80 and that is handy as long as the Buss Request line is not hard wired to Vcc (then you have to cut the trace and add a pullup). Look in the FTP section under /Fluke/90 Series for the story... The 90 series was designed by a Canadian and sold through Fluke, I tried to talk with the designer back in the 00's, but he never got back to me... John :-#)# -- How to subscribe or unsubscribe from TTL http://seven.pairlist.net/mailman/listinfo/techtoolslist _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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FREE: Fluke 9132A ROM adapters and Fluke manuals
by Tony Jones 04 Mar '18

04 Mar '18

All free. Please don't reply unless you're willing to promptly pay the shipping as PayPal gift. ROM Adapters (new but unboxed) - 9132A-024 ROM module (qty:5) - 9132A-028 ROM module (qty:1) - 9132A-032 ROM module (qty:1) Manuals: - Supplementary Pod Information for 9100A/9105A users (qty:3) - 9132A manual set (3 manuals - 68030, 68020 and 80386) (qry: 2) - 9132A manual 68020 - 9132A manual 80386 - 9100 series, getting started (crease on cover) - 9000A-80186 interface pod and getting started guide - 9000A-8048 interface pod - 9000A-80186 Interface pod (spine creased/worn; corners creased) - 9000A-1802 Interface Pod (spine creased/worn) Shipping is media mail for the manuals and USPS 1st class for a single ROM adapter. Multiple adapters would be Priority Mail. I'm charging only what USPS charges me. If you want to take multiples or the entire lot that's fine with me. _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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BK cmos IC Tester 552 manual wanted
by Biermayer Manfred 23 Feb '18

23 Feb '18

Tony, I just purchased a 552 including manual overseas. I will scan the manual as soon as I get it (in abut two to three weeks). Best Manfred _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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BK cmos IC Tester 552 manual wanted
by tonyhtbsusa 21 Feb '18

21 Feb '18

BK cmos IC Tester 552 manual wanted Looking for manual Thanks tony Hi-tech arcade repair _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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Fluke 9000A mystery adapter (for me at least ;-)
by John Robertson 20 Feb '18

20 Feb '18

I have a pod module here called "Z8 I/F ADAPTER" Fluke #9000-200/AB. It has no cable to the base, just a 40 pin CPU cable. Inside is a couple of RAM chips, and some Fluke hybrid interface ICs. Any guesses? John :-#)#

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