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I want to control an electronic switch that needs a couple of TTL level
signals. It is possible to use a Sun for this? I was thinking about
programming the parallel port, which has in the past been used in PCs,
but I'm not sure how easy it is on a Suns - I have a feeling it is not
so easy.

Suns available include a SPARCstation 20, Ultra 60 and Netra T1. Speed
is not an issue and I dont mind sticking a transistor on the output if
needed.

Dave <[email protected]> wrote:
> I want to control an electronic switch that needs a couple of TTL level
> signals. It is possible to use a Sun for this? I was thinking about
> programming the parallel port, which has in the past been used in PCs,
> but I'm not sure how easy it is on a Suns - I have a feeling it is not
> so easy.
>
> Suns available include a SPARCstation 20, Ultra 60 and Netra T1. Speed
> is not an issue and I dont mind sticking a transistor on the output if
> needed.

sure. why not? Parallel is parallel, and can drive a transitor or even
better, an optoisolator, then your load.

Cydrome Leader wrote:
> Dave <[email protected]> wrote:
>> I want to control an electronic switch that needs a couple of TTL level
>> signals. It is possible to use a Sun for this? I was thinking about
>> programming the parallel port, which has in the past been used in PCs,
>> but I'm not sure how easy it is on a Suns - I have a feeling it is not
>> so easy.
>>
>> Suns available include a SPARCstation 20, Ultra 60 and Netra T1. Speed
>> is not an issue and I dont mind sticking a transistor on the output if
>> needed.
>
> sure. why not? Parallel is parallel, and can drive a transitor or even
> better, an optoisolator, then your load.

The issue is how do I program the parallel port to give the outputs I
want? On a PC running DOS it was only necessary to write a byte of data
at whatever the IO port for LPT1 or LPT2 were. But on a multi-user
operating system like Solaris, it is certainly not going to be as easy -
no non-root user