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 | | Re: Malloc
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| 8K might be all that IC allows for user global data. The memory map can be rearranged, but only at the compile-time of the IC application. Newton Labs should be able to give you a definitive answer about the memory organization of IC 3.1. -Fred In (...) (28 years ago, 12-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Initial Download Problems
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| you easily could have blown chips if the vreg was shorted. then you're putting the direct batt voltage into the chips. just about any chip could be blown. sorry for the bad news! i'd try ordering the socketed parts from jameco and swap chips. fred (...) (27 years ago, 30-Oct-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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fred
(score: 1.028)
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| | Re: Infrared Optosensors
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| 1/2" is actually pretty good range for a basic reflectance sensor. try using them in the analog inputs -- you should get readings that let you read out to about 1". to get better than that, you need a modulated signal, like Pandit has described. (...) (26 years ago, 5-Jun-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | followup: Initial Download Problems
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| just to add a bit, the chips that can be bad if you can't bootstrap are the 6811, the RAM, the 'hc04, and the soldered-down 'hc373. If you have any easy way of swapping first 3 of these 4 these chips, try it. Fred (...) ? (...) co (...) (27 years ago, 30-Oct-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: IC problem
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| Jeremy, You have to give us more information about what you've tried. Have you re-downloaded pcode_hb.s19 to your board? Do you get the boot beep and LCD message when you turn your board on? Have you changed your desktop computer configuration at (...) (27 years ago, 1-Dec-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | public apology
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| Yes -- I didn't think very hard and in retrospect it's fairly evident that Jan-Sipke's code is just the starting step. Sorry for being such a blunderhead. (Jan-Sipke and I have been exchanging some private messages and I think he's closing in on a (...) (27 years ago, 14-Feb-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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fred
(score: 1.028)
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| | Re: windows nt and hb
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| the advise of turning off the serial port under NT was only to enable using the IC DOS apps. if you are using contemporary software tools, then it is not necessary to do so. just access the serial port according to the recommended manner. fred In (...) (26 years ago, 8-Aug-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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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: 1.028)
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| | Re: Expanding the memory of the handyboard
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| Dear Kevin, Please forgive this non-answering of your question, but I am curious as to what kinds of hardware projects/software objectives were your students working on when they ran out of 'hc11 memory, and how did they deal with this circumstance? (...) (27 years ago, 16-Feb-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Servo Routines
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| can you ascertain whether the knob is returning the same value every time through the loop? i wasn't clear if "even when the knob is not changing" meant just that you weren't turning the knob, or whether you were sure it was always producing the (...) (26 years ago, 13-Apr-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: troubleshooting
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| In your message you said: (...) good.... (...) yes, this is normal -- before you load pcode_hb.s19, the LCD is just as you describe. (...) d (...) I'm not clear the problem. if you enable "ignore feedback", does it then download properly? if so, (...) (26 years ago, 27-Jul-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: bootstrap mode in assembling the HB
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| yes, RP4 is four isolated resistors, and this being part of the serial line circuit, definitely explains your problem if you are using the common-terminal style. you can just install four 1K resistors if you don't have the correct r-pack handy. fred (...) (26 years ago, 9-Sep-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | charger
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| I have an old 'wall wart' lying around. It has a rating of (12 vdc 1 amp output). i was wondering if i can use it on the handy board. the specs i read about the handy board call for a 12v 500mAmp output. any response would be appreciated. FRED (25 years ago, 9-May-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | (no subject)
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| (...) See my home page, (URL) for information on the Programmable Brick project. Just so it's clear: MIT is not, and is not going to, release the design for the P-Brick. Any info published is "FYI" only; this board is not being distributed. -Fred (28 years ago, 5-Nov-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: pink book
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| See the Handy Board Technical Documents page, linked off of the main page. It's the MC68hc11 reference manual. It's no longer free, but it's really inexpensive (like $2.50 per copy). This is a 200+ page book, extensive, in depth, and well written. (...) (28 years ago, 10-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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fred
(score: 1.028)
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| | Re: CHARGER BOARD PROBLEM(URGENT)
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| phillip, please go through the sequence of tests in the assembly directions (as if you were building the serial/charger board from scratch), and indicate the point at which you first detect a problem. (URL) your message you said: (...) (26 years ago, 26-Dec-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Servo DEinitialization.
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| (...) as it says in the docs: init_expbd_servos(int action) If action is zero, servo control signals are disabled. If action is non-zero, servo control signals are enabled. Control signals are disabled by default every time the Handy Board is reset. (...) (25 years ago, 13-Apr-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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