Hi, all! I decided to leap in with the first post of 2002 - Happy New Year, everybody! - and ask Gene a couple of things about the Rollscan-1 board. I have...
Happy New Year all. My best Christmas present of all time arrived amidst the holiday excitement, ROLLSCAN-1. When Gene offered to fit this complicated chip...
A couple of pointers regarding stepper motors using the diagnostic program MB.EXE: 1) ABSOLUTE MAXIMUM working voltage of the stepper driver circuitry is 25V, ...
Hi, Bob The LM9830 chip tightly couples the stepper motor drive circuitry to the scanning process, which is how it guarantees scanning accuracy. It ...
Hi Gene, I'm wondering about your 2nd suggestion, "Let the LM9830 free run the sensor." In my other scenario, before I subscribed to the roll scan, I was...
Craig, The LM9830 chip operates the sensor at a constant rate, regardless of whether or not you're using the stepper motor. If you don't use the stepper ...
Hi Gene Would there be an functonal problem if the board were to be mounted in a 'utility box' and the connections to the board brought, via short cables, to...
Albert, There's no functional problem whatsoever with putting the RollSCAN-1 in a box and using transition cables/connectors to extend the connections to the ...
Some of you may have noticed that J1 (parallel port) and J6 (sensor/illumintor) are placed quite close together. Although the layout house placed the J1 and J6...
Hi Gene I am going through all your material once again and am a bit vague on which pin of the 12 CIS connector pins goes to which pin of the J6 'on board'...
... Ah-ha! I've been thinking about this, and clearly here is the point - you are right that elementary sampling theory implies that if the paper speed varies...
Dear people: Presumably some people now will be able to construct scanners, armed with their CIS units and Rollscan-1 interface card/controllers. It's time to...
Bob, Using the spec sheet nominal clock rate for the DL408-03CSM, which is 1MHz, the line rate is approx. 1MHz/3700 or about 270 lines per second. (In order ...
... Dear Gene and everyone: Thank you for you very quick reply! I should think that a 4-bit grayscale would be way, way adequate for our purposes! I take it...
Bob, ... the ... suddenly ... it ... the ... The speed change is almost instantaneous, because the paper on the transport "stalls" due to friction while the...
... The AVAILABLE driving force decreases, not the force applied -- but the available driving force is not a problem. There's plenty of driving force ...
Bob and all, It seems to me that you could up your roll speed to a tempo of 120 without any problems. If you have a resolution of .0125" now at a tempo of 60,...
Dear Craig and folks: I thought it was about time that I was concrete about the subject. So I've uploaded to the Files area two files. One is a MIDI file of...
Dear people: It occurred to me reading Gene Gerety's comments that I perhaps need to clarify my motivations a bit. I am not stubbornly ignoring suggestions to...
Bob and everybody, When you refer to the "tracking," are you referring to a mechanical tracker? I was under the impression that we didn't need mechanical...
Hi Craig and all I fully agree with you. There is a place and a time for every thing and especially for new or other ideas, but now that we all, I assume, have...
Craig -- and everyone, What you're asking for (simple "insert tab A into slot B" type of instructions) is precisely what I intend to provide -- in the final...
Dear people: I think that it's really wonderful that several folks are champing at the bit, as it were, to get their scanners built. However, let's remember...
First, thanks to Bob for his explanation. I was wondering why he was fighting the stepper motor and capstan issue. I must admit that I did for years. Now I...
So Bob, Have you checked that test roll with the "software tracking" off yet? You said, and I'm confused again, "Remember in the Stibbons system, the raw...
Dear Craig, et al.: Oh, dear. I seem to have somehow muddied the waters when my intent, as always, is to clarify them. What I wrote, regarding the test run I...
Thanks, Bob. You're not talking to someone really smart when you put up with me, you know. So I really appreciate the explanation. Maybe somebody else does,...
... I hope so, too. ... Well, you run another piece of software. This whole business is very largely a matter of converting files from one form to another....
Ok, Bob, Now I think we're getting into it! So far then, here's what has transpired in our conversation, to me. Craig: "cakewalk only takes MIDI files. So...
I am using the software written by Richard but have added a few minor modification to deal with the Duo-Art rolls that I have been scanning. There is a...
