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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: 1.028)
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| | Re: dc motor blues
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| yup, here's what's going on. the motor percent argument controls the POWER, not the speed. if the motor is essentially unloaded, it will run at nearly full speed even at a low power percentage. if you build a gear train that makes the motor do some (...) (26 years ago, 10-Apr-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: motor port problem
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| you may have blown one of your L293D chips. try swapping the two chips to see if the problem then migrates to motor 1. if it does, then you have blown an L293D. there is more info on debugging motor problems in the FAQ. See the answer to "One of the (...) (26 years ago, 17-Nov-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Interactive C Primitives
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| these are documented in sec 5.10 of the hb tech ref. the larger issue is knowing the places you are supposed to peek and poke. some of these are hardware specific (e.g, motor port); others are software based/defined in the pcode implementation (...) (26 years ago, 7-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Disaster :-(
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| it's extremely unlikely that removing a battery will have done any harm. which program precisely are you using to download the pcode? you should be using HBDL.EXE or DL.EXE or DLM.EXE. you should be trying to download PCODE_HB.S19. also, make sure (...) (26 years ago, 11-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: dc motor output control? Please help!
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| the short answer is that you can't use 3v motors with the handy board. the FAQ states this: (URL) you use the "separate motor power supply" hack, with a 6v battery, you might be able to get 3v motors to work. see (URL) your message you said: (...) (26 years ago, 25-Dec-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | HB bootstrap problem when U6 installed
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| i am guessing that some of the inputs to u6 are defective, causing it to assert its outputs when it shouldn't. this could turn on the '244 input latch, driving the bus when it should not. please check that pins 1 through 6 signals are oscillating (...) (26 years ago, 4-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Resets
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| (...) I can't say that I have an explanation of why the motors would work at first and then cause problems later, but I can say that: Not all motors work with the Handy Board. In particular, motors that want to draw too much current (e.g., more than (...) (29 years ago, 22-Mar-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Expansion interface status
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| (...) Yes. The current status is "on hold" while I rethink the feature set. I'm considering doing something more like Scott Edward's little servo board for HB expansion: that is, a collection of small, physically detached boards. For servo's, I (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Servo_a5 (fwd)
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| (...) OK. Thanks for letting us know. I have updated the FAQ to reflect your observation. (...) Can you try -not- loading your modified servo.c and see if you can get the A5 servo to work? Make sure neither servo.c nor servo.icb is loaded, and then (...) (28 years ago, 13-Nov-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | beta test close date this friday
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| Hi all, I got a number of replies to the expansion board beta test program on sunday night and monday, but just one yesterday, so: I'm moving up the closing to this friday. If you're interested and you haven't contacted me yet, please do so by then, (...) (26 years ago, 17-Jun-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Yellow Leds & Battery
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| (...) are you sure you have enough voltage on the adapter? You need at least 16- 18 v open circuit, or an adapter rated for 12 volts at 500 mA. Your symptoms are consistent with an adapter that is rated with too little voltage. (...) Not sure what (...) (29 years ago, 5-Mar-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | re: Digital Micro Systems
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| (...) I called them up a couple of weeks ago to order complete boards, and they said they were backordered on the completed kits, but could send an unassembled kit. So I ordered a kit and it arrived in 3 days. It turned out that I had received a bad (...) (27 years ago, 20-May-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Smooth PWM Routines!
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| Julian Skidmore <skidmorj@cs.man.ac.uk> has implemented and released a new algorithm for performing the pulse width modulation on the Handy Board's motors, allowing up to 100 power steps rather than just eight! This is a big, big improvement over (...) (27 years ago, 3-Dec-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: what variety of 6811 can be used?
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| (...) why does the 512 bytes matter? the HB has 32K of external ram. i guess if you're planning to do rom-able code development then i understand. there's very little difference between the e and a series. the port A counter/timer pins are slightly (...) (26 years ago, 2-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: more downloading
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| Hi Dave, can you try the DLM.EXE (not hbdl) program off the software resources web page? you will have to use the "-256" flag because it defaults to -512 for the e1 version of the 6811 which is probably not what you have. also, if you have windows (...) (28 years ago, 6-Dec-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | weird headers
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| That particular weird header is originated by John Whitten, aka root@snotnose.wizard.org, not my mail list program. All my mail list program does is forward along any mail sent to "handyboard@media.mit.edu" to each person on the distribution list. (...) (27 years ago, 22-May-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: downloader for SGI
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| Nari: I don't know of a precompiled SGI version. You can build one yourself from the sources listed in ftp://cher.media.mit.../projects/ interactive-c/source/. Also, please be aware that when you send mail to "handyboard@media.mit.edu" you are (...) (27 years ago, 12-Mar-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: IC PROBLEM
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| yes, you are having lib conflicts. you should get the latest at (URL) latest has _raw_analog in the .icb file and NOT in the lib_hb.c file. re: synchronizing probs, try running IC in a full screen DOS window, or boot your computer in DOS mode. the (...) (26 years ago, 18-Jan-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: expansion board schematic posted
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| It is largely a space issue, not only for chips but connectors. It definitely would be feasible to remove one of the analog muxes and substitute an output latch in its place. Then the specs would be 8 general purpose, 4 hi impedance, 4 LEGO analog (...) (28 years ago, 7-Feb-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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