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 | | status of the expansion board
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| Hi all, Many people are asking about the Expansion Board. It has been on the "back burner" because my publisher is demanding text, not technology. But I do plan to release another rev this summer. My ideas about what should go on it have evolved, (...) (28 years ago, 11-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.041)
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| | Re: L293 vs TI 754410
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| (...) The TI chips should work fine. You might not get a full 2A, but at least a 50% improvement. (...) The traces can handle it, but the PolySwitch fuse should limit total current to about 4 to 5 A. You might need to remove the fuse and live (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.041)
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| | Re: Source for LCD's
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| (...) From the components supply list at (URL) compatible retail display is the Hitachi LM-052L. Supplier info for Hitachi parts is available at (URL) Other valid manufacturers/part numbers: Alps LDS7A1792A; Optrex DMC16249. (...) Electrically, any (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.041)
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| | Re: Questions, questions, questions......
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| (...) The Handy is like the 6.270; both have dig out latches going to the motors. The RW drives the motor ctrl pins directly. A re-write of the system PWM routines could provide finer than 8 levels of control, even w/o needing HW timer lines. (...) (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.041)
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| | Re: Handyboard LCD
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| (...) Go to the IC Source page, linked off the software resources page. This has links to the source code. YOu need the pcocde for the HB, the special as11 assembler, and a shell script facility for the as11_ic program. these are all pthere. look at (...) (28 years ago, 4-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.040)
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| | Re: unsubscribe
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| Kevin, you are removed. Reminder to all: to get removed, send e-mail to me personally so everyone doesn't need to see your request. For more, see enclosed. Thanks. -Fred In order to remove you from the Handy Board mailing list, I must have your (...) (28 years ago, 4-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.040)
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| | Re: Handyboard LCD
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| there are two assemble-time constants LCD_ROWS and LCD_COLS that can be changed to build new versions of the pcode_hb.s19 file for different LCDs. but is sounds like your 20x4 display is incompatible altogether---you should see something. i would (...) (28 years ago, 3-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.040)
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| | Re: How to disable ROM on E9 part?
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| Hi Curt, something is wrong with your board. 1stly, the red LED should be completely off when in boot download mode. this is stated repeatedly in the doc's, but i reiterate it here. 2nd, you should not have 1.4v on the CPU when pwr is off. i don't (...) (28 years ago, 2-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.040)
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fred
(score: 0.040)
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| | cher is up again
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| but the incoming directory is disabled. i don't see any way around this problem; if there are incoming directories, it seems this gang of crackers will find them. i would still like to encourage people to contribute robotics related stuff, but it (...) (28 years ago, 1-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.040)
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| | Re: status of the expansion board
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| Hi I think that Fred's idea for the expansion board is OK, but I'd also like to see a "bare-bones" expansion board for those hardware hackers amongst the HB community. What I mean is just a simple board with a few more analog input's, and two sets (...) (28 years ago, 12-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.040)
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| | Questions, questions, questions......
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| Hi I've just built my first HandyBoard (thanks for the great service Prabal), and have a few questions (that I can't find in the FAQ). What are the hardware-imposed software differences between the HandyBoard and the 6.270/Rug Warrior boards ? ie it (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.040)
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| | Re: How to disable ROM on E9 part?
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| (...) Thanks Fred. Turned out I had a damaged MAX232 chip on the charger board that was powering up the handyboard via the TXD or RXD line. Once the chip was removed the 1.4V on the handyboard went away. I believe this also damaged the HC11, so now (...) (28 years ago, 2-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 0.039)
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fred
(score: 0.039)
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fred
(score: 0.039)
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fred
(score: 0.038)
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| | Polaroid info
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| FYI: This info is copied out of the HB e-mail archive. There's lots of good stuff in there, it's pretty easy to search as plaintext. -Fred Polaroid 119 Windsor St, Cambridge, MA 02139 tel: 617.577.4681 fax: 617.577.3213 tel: 800.225.1000 ordering (...) (28 years ago, 8-Jun-96, to lugnet.robotics.handyboard)
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fred
(score: 0.038)
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| | are you a graduating student?
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| If so, please me know if your e-mail address is about to be blown away. I've noted a surge in bad addresses on the list from the .edu sites. also, this is a reminder to all that the way to unsubscribe is to find your e-mail address by clicking the (...) (28 years ago, 7-Jun-96, to lugnet.robotics.handyboard)
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fred
(score: 0.038)
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| | (no subject)
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| (...) all sensor inputs have a 47K pull-up resistor. If you remove this (by cutting the trace between the sensor input pin and the 47K resistor pack), then the analog inputs are pretty high impedence, like a meg or so. You should get the "M68HC11 (...) (28 years ago, 7-Jun-96, to lugnet.robotics.handyboard)
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fred
(score: 0.038)
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fred
(score: 0.038)
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