Re: Tutor needed for college student

Jim, THANK YOU You are taking it further than most of the high schools were 20 years ago. It was incredibly rewarding when I could assist an epiphany, such as that arithmetic could be done IN binary/hex/octal, WITHOUT conversion to decimal/arithmetic/conversion back! California mandated

Re: Firing up the pdt11

Well, the drive is working. Better. Summary: The PDT11/150 needs to have resistors on the harness to the floppy drives to limit the current for the sector LED. Without it the LED will be "off" and you will get a quick 8 stepper motor clicks without any click to load the heads. Looks like the

Re: Tutor needed for college student

Cindy - if he can't find any other alternative, please feel free to forward his contact info to me, or send my e-mail address to him (a Reply To will expose it), cc: me. The rest of this is background for those who may be curious about the state of our educational system from someone on the

Re: Tutor needed for college student

Hey Cindy Just to add to the good suggestions already given here I’d suggest looking on Craigs List. Typically there are some good (starving) grad students that do tutoring on the side. Kirk Sent from my iPad > On Oct 12, 2020, at 8:14 AM, Cindy Croxton via cctalk > wrote: > > If anyone

Re: Tutor needed for college student

Remakable. It was not the descrete math I know, then. It would vary heavy on logic and set theory stuff. Not the kind of stuff I deal with at work. It was a long time ago though. Things have changed. The closest we go to a real computer was a Monrow calculator. Dwight

Re: Tutor needed for college student

I agree with the others: go look for other textbooks. There are also surprisingly good "webinar's" on various math related topics on YouTube (free), so it might be worthwhile to have him do a bit of searching. Oddly, I never had any discrete math courses in school...it was "old school EE" so

Re: Tutor needed for college student

If the textbook isn't working for him, . . . 1) Look at OTHER textbooks on the subject. There is even a Schaum's "made easy , "Outline Of Discrete Math" by Lipschutz. The title promises more than it can deliver, but it might help get through some of the more troublesome sections. 2) Seek out

Re: Tutor needed for college student

On Mon, Oct 12, 2020 at 4:58 PM Will Cooke via cctalk wrote: > > > On 10/12/2020 3:29 PM dwight via cctalk wrote: > > > > > > I'm not too sure Hackers will have someone that is into Discrete Math. > It is way beyond what a typical engineer will go through to get a degree. > It is not a course

Re: Tutor needed for college student

On 10/12/20 4:29 PM, dwight via cctalk wrote: I'm not too sure Hackers will have someone that is into Discrete Math. It is way beyond what a typical engineer will go through to get a degree. It is not a course someone would take without expecting to get into theoretical mathematics.

Re: Tutor needed for college student

> On 10/12/2020 3:29 PM dwight via cctalk wrote: > > > I'm not too sure Hackers will have someone that is into Discrete Math. It is > way beyond what a typical engineer will go through to get a degree. It is not > a course someone would take without expecting to get into theoretical >

Re: Tutor needed for college student

I'm not too sure Hackers will have someone that is into Discrete Math. It is way beyond what a typical engineer will go through to get a degree. It is not a course someone would take without expecting to get into theoretical mathematics. Dwight From: cctalk on

Re: Mystery QBUS memory card

On Sun, Oct 11, 2020 at 5:38 PM Noel Chiappa via cctalk wrote: > Hi, I'm trying to ID this: > > http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/QBUSMystMem.jpg > > mystery QBUS memory card. I think it's a 64KB card It is. 4 banks of 4116 16Kx1 DRAMs. I don't recognize the logo, but I _might_

Re: Tutor needed for college student

have you looked into your local hackerspaces at all? https://hackerspaces.org/ list of them all over the world. >

Re: Firing up the pdt11

Curiouser and curiouser On a lark I got a 47 ohm (actual reading 50.1 ohms) resistor from the box, put it on the anode supply line of the sector pulse LED on the drive that is in the PDT11 (not the one with the blown LED) and hooked it up to the power supply. With the resistor in I

Tutor needed for college student

If anyone has spare time, and is familiar with discrete mathematics, I have a friend who is a young college kid and desperately needs a tutor. His prof just says to read the book, and take online quizzes. He is failing. If you can help, please email me. He is in Delaware. -- Cindy Croxton

Re: Firing up the pdt11

On Mon, Oct 12, 2020 at 4:04 PM Chris Zach wrote: > > > In a 'real' RX01, each sensor LED (track 0 and index) has the cathode > > grounded and the anode connected to +5V via a 68ohm series resistor. > > If you measure the voltage across the pins with the LED disconnected > > (or if the LED is

Re: Firing up the pdt11

In a 'real' RX01, each sensor LED (track 0 and index) has the cathode grounded and the anode connected to +5V via a 68ohm series resistor. If you measure the voltage across the pins with the LED disconnected (or if the LED is open-circuit) with any reasonable meter, it'll read 5V. The meter will

Re: Firing up the pdt11

> One is for the solenoid that lowers the pad onto the disk to allow > reads/writes. > > One is for the sensor to detect track 1 (LED and detector) > > One is for the sensor to detect sector pulse > > One is for the servo motor that moves the head in and out > > One is for the read/write head > >

Re: Firing up the pdt11

When you swap the cables (and keep the drives in place), do you mean that you swapped the data connection **and** the power supply cable(s)? There are six wire bundles and connectors that hook an RX01 floppy drive sub-module to the RX01 read/write controller board (or the PDT11 controller

Re: FIRE SALE!

-- Original Message -- From: "Al Kossow via cctalk" To: "General Discussion: On-Topic and Off-Topic Posts" Sent: Monday, 12 Oct, 2020 At 00:54 Subject: FIRE SALE! http://www.vcfed.org/forum/showthread.php?77118-Fire-sale-PDP-11-stuff

RE: Firing up the pdt11

See below. Van: Chris Zach via cctalk Verzonden: maandag 12 oktober 2020 03:14 Aan: Richard Pope; On-Topic and Off-Topic Posts Onderwerp: Re: Firing up the pdt11 Well, by "location" I mean there are plugs