February 2005 - TechToolsList - listserv.classicarcade.com

RE: Techtoolslist Digest, Vol 4, Issue 7
by Robert C. Bullock 24 Feb '05

24 Feb '05

John: ----- However when I replaced the suspect 175, no sounds, and when I put the original 175 back in the (now socketed) PCB, I don't get the sounds even with the Bugtrap the same way. ----- Hmm, the only similar thing I've seen is a bad -5V reg (7905) on Atari Roadblasters in the sound section. Putting my logic comparator on one of the chips fixed a problem with the scrolling playfield, but killed the sound. Take it off, it scrolls again, sound works. Replacing the voltage regulator fixed it. The voltage on the pulse to sync that section of the board was low. You'll have to Google this or give me a deal on that pinout cart :) and I'll dig the particulars back out. This sounds somewhat similar. _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist

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RE: Techtoolslist Digest, Vol 4, Issue 6
by Robert C. Bullock 22 Feb '05

22 Feb '05

It should not matter, I need to do only oddball PROM variants, and if you try to use PROMlink, even though you are not using the pinout cart, it complains that it is not there. I will use my more modern EPROM burner (PC printer port based, with support still) for the newer stuff. --- From: Franklin Bowen <Franklin(a)Bowen.net> Subject: Re: [Techtoolslist] WTB: Pinout cart for Unipak 2B Which cart are you looking for? There are different ones that will fit in there and program different devices, AFAIK. One of them does larger EP ROMs. Not sure what the others do. --- _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist

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Help needed with a 6809 Pod Problem, 9010A
by Mark Hooks 22 Feb '05

22 Feb '05

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Re: [Techtoolslist] WTB: Pinout cart for Unipak 2B
by bsltron＠videotron.ca 22 Feb '05

22 Feb '05

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Advantages of Fluke 9100A/AF over a 9101A
by David Fish 19 Feb '05

19 Feb '05

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RAM tester project
by joemagiera 18 Feb '05

18 Feb '05

Those that know me will think I'm in way over my head on this. I might agree with them, but I'd like to try. Since I can't find anything on the 'net, I'm toying with the idea of building a RAM tester. Specifically, I'd like to start with a 4116 tester. Heck I figure if I can get that to work, it should be a snap to test other types of RAM. I recall someone on this list from South America (Brazil?) was attempting the same project but sadly we never heard from him again. I admit up front, I have no background in this type of stuff, but I do have a willingness to try. My long range general idea so far is to have a fairly large breadboard with 25 ZIF sockets on it. From there, wire the appropriate voltage pins to a common point so I can supply power via a switching power supply. That in itself is probably enough of a challenge for me, but assuming I can do that (and that's a pretty big assumption), then what? I'd like to have it interface with a PC to run a program to test the RAMs at various speeds. I know pretty vague, but that's where I'm looking for your input. Thoughts? Ideas? Advice? Any comments appreciated. Thanks, Joe joemagiera(a)ameritech.net _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist

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Test
by James McGovern 16 Feb '05

16 Feb '05

_______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist

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