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 | | Re: stacked L293's
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| It sounds like you have some kind of short in your L293B/D circuit. Do you have any single chips you can try separately? This method of stacking chips does often work, but you might have blown one, and then the two of them are fighting each other. (...) (27 years ago, 14-Jun-97, to lugnet.robotics.handyboard)
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fred
(score: 0.955)
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| | Re: NiMH batteries?
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| (...) Well, that is one of the great benefits of NiMH batteries is that they can be charged without ever having to completely cycle them. They are really convienient in Cel phones since you can use a trickle or 'zap' type charge on them no matter (...) (27 years ago, 16-Jun-97, to lugnet.robotics.handyboard)
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fred
(score: 0.954)
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fred
(score: 0.954)
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| | Photos: Is that you, Fred?
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| Fred, Please could you tell me which one of the people in the photos is yourself? It's nice to have a face to think of when reading mails from people! Maybe some of you other "regular" supporters could tell us who you are? Richard (27 years ago, 13-May-97, to lugnet.robotics.handyboard)
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fred
(score: 0.954)
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| | Re: Bootstrap Mode, Problem
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| Fred, Thank you very much for your response, I was able to complete the first step succesfully(1). However Step 2 does not complete succesfully the Red Led goes off and the green led stays on. Here is how my cables are configured when I hooked up my (...) (28 years ago, 24-Oct-96, to lugnet.robotics.handyboard)
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fred
(score: 0.953)
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fred
(score: 0.953)
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| | Re: No messages since May 5,1997
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| (...) Dear Alex, If you have not been receiving messages from the Handy Board list then it is likely to be the simple case of your mailer bouncing a message and my removing you from the list, as per the stated policy. I frequently and without (...) (27 years ago, 28-Jun-97, to lugnet.robotics.handyboard)
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fred
(score: 0.953)
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| | Re: voice synthesis
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| (...) [snip] RC Systems, Inc. makes a low-cost ASCII to voice board that provides far better performance than the now-discontinued General Instrument speech chip set many are familiar with. The RC Systems product is a small board with a CPU and a (...) (27 years ago, 1-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 0.953)
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fred
(score: 0.953)
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fred
(score: 0.953)
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| | Re: voice synthesis
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| Jeff, JDR Microdevices sells the General Insturments CTS256AL2 chip (GI8642CAA) for ** $4.95 **. This is (I think) a slightly newer version of the same chip that Radio Shack used to sell. I bought one of those with an order from JDR, but haven't had (...) (27 years ago, 5-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 0.952)
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| | Re: Corrupted or Invalid Pcode?
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| James, Thanks for following up. The reason for this behavior should be fairly evident -- there are traces very close to the mounting screw holes. Your metal washers must have shorted them together, affecting wires to the memory. I do mention to use (...) (27 years ago, 11-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 0.952)
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fred
(score: 0.951)
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| | HOW TO UNSUBSCRIBE
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| greetings all, this is the periodic reminder to please NOT send unsubscribe requests to the list en masse. to unsubscribe, write DIRECTLY to me, Fred Martin, fredm@media.mit.edu. regards, fred (27 years ago, 13-Aug-97, to lugnet.robotics.handyboard)
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fred
(score: 0.951)
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| | back-ordered from DMS/Prabal Dutta?
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| Hi everyone, I have been receiving word of people having orders 8 to 10 weeks old with Digital Micro Systems/Prabal Dutta that have not been filled. I would like to assess the situation more generally. If you presently have items back-ordered at (...) (27 years ago, 17-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 0.951)
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| | Re: FW: Serial Communications.
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| Mike -- Doesn't the Mini SSC have a TTL-levels mode, making the MAX232 unnecessary? Please send your serial output code, though. that would be good to distribute. -Fred In your message you said: (...) (27 years ago, 21-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 0.951)
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| | Re: assembling I/C board
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| (...) Well, if the power LED didn't light, then you don't have power to the MAX232 chip (unless the LED is installed backward or broken). It sounds like you've already skipped ahead without passing the first set of tests, which I've copied from the (...) (27 years ago, 19-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 0.951)
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| | Re: Geting Started?
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| Why don't you start by perusing the web site... pretty much all of your questions are answered there. The site's home URL is (URL) in particular: * the FAQ * the "get your hands on a handy board" * the software resources page * the tech docs page (...) (27 years ago, 21-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 0.951)
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| | Re: Voltage
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| (...) 12v is fine. you could up go to 18v or so w/o problems. you might not even need to change the adapter. if the yellow charge LEDs light, then the batt is charging ok. it will be slower than the original pack but maybe that is not a problem for (...) (27 years ago, 20-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 0.951)
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| | Re: Which 68HC11x1xx
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| 'a0 is an earlier and discontinued version of the 'a1. 'e1 has some different features than the 'a1 but is almost identical for HB purposes. 'e1 has a little more internal RAM (which isn't really used by Interactive C) and some more flexibility on (...) (27 years ago, 24-Jul-97, to lugnet.robotics.handyboard)
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fred
(score: 0.951)
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