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

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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