Re: [CAD_CAM_EDM_DRO] TTL 101 was Re: troubleshooting help

Bill,

What I would like to see is a config or ini file which could be edited so I
could choose
pins, ports, mm, inches, and diameter (for lathe work). I could get by with
Lindsay's
software if the pins could be reassigned.

Old 486 and P1 laptops can be had real cheap and would make great dro units
if we
can overcome the p-port problem which I think can be done in software.

Bob


At 11:03 AM 2/19/2002 -0800, you wrote:

>Aside from a, "switch", to change the readout from mm to inches, what else
>would
>you want to program a DRO to do?
>
>Bill
>
>On Tue Feb 19 07:04:12 2002, Robert Bachman, <bobach@...> wrote:
>
> >Ballendo,
> >
> >Yes I'm aware the actual voltages are not 0 and 5 but just used
> >those to state my question. Probably should have used the terms
> >'high or low' instead.
> >
> >Thanks for everone's input. My goal is to come-up with some dro
> >software which will run on a loptop with the old 'standard' p-port
> >by using the status pins is input. Lindsay's software would work
> >if the code could be changed to look at the status pins instead
> >of the data pins.
> >
> >I'm not a C++ programer so it is a little beyond my capabilities.
> >
> >Bob
> >
> >
> >At 12:39 PM 2/19/02 -0000, you wrote:
> >>Bob,
> >>
> >>Although many are saying 0v and 5v, that is not "really" correct.
> >>
> >>What TTL** WILL guarantee is that a logic "0"(Lo) will be LESS
> >>than .8v and a logic "1"(HI) will be MORE than 2.4v
> >>
> >>I know that Jon, Alan, and the other electronics guys know this
> >>already. We casually speak of 0 and 5v(knowing the "truth"), but
> >>since many on this list do NOT know already; and may be using a meter
> >>to "check", I thought it would be worth mentioning...
> >>
> >>Many times a "measured"(typical) HI will be about 3.3v, and a
> >>measured Lo about .4v...
> >>
> >>**Transistor-Transistor-Logic. The basis for the original IBM PC
> >>parallel port circuitry. Nowadays the ports use different electronic
> >>means to accomplish the same ends results.
> >>
> >>Hope this helps.
> >>
> >>Ballendo
>
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