HP-IB disc drive emulation program available
ard at p850ug1.demon.co.uk
Fri Dec 18 13:28:18 CST 2009
> On Thursday 17 December 2009, Tony Duell wrote:
> > The thing is that I suspoect (without reading the data sheets) that
> > most microcontrollers can't meet the HPIB spec on their port pins,
> > you need to put something between the port and the 24 pin
> > microribbon connector. Might as well be one of the chips designed
> > for the purpose.
> > In any case I have an objection to linking an expensive (probably)
> > custom-programmed (certianly) part to an external connector that's
> > going to be linked to $deity-knows-what. Much easier to replace a
> > buffer chip if somethign goes wrong than replace the
> > microocontroller and have to program it again.
> I see "meeting specs" as a potential problem (though if it's the only
> device on the bus besides the controller, , you can probably "get away"
'Getting away with it' is something I will do for quick hacks on my own
bench, but not for stuff likely to be used by others, or stuff I depend
> with it). However, the microcontroller may easily be less expensive to
> replace than the HPIB buffer (especially if you compare the price for
> each new/NOS).
Possibly. I said 'easier', not 'cheaper' though. The point being that the
buffer chip doesn't have to be programemd, so it can be replaced by
somebody who doesn't have a programmer for whatever microcontroller is
used. Most modern microcotnrollers (at least ones with enough I/O for
this) come in a surface-mount package, the buffers certainly were
available in DIPs (and could be socketed).
Repair cost != component cost...
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