Connecting items to Port C pins

[victorf]

I am going to use a ZX-24 to replace a much older controller in an app. I have been reading the docs and understand how to do most of what needs to be done to make the change. I do have a question or two regarding interfacing items to Port C. I wish to attach a piezo-buzzer (BZ) to one pin and a couple of switches (SPST) to other pins. The BZ is currently interfaced to the other controller with an NPN transistor as follows:

+5Volts to + side of BZ. BZ minus to collector of transistor. Emitter is grounded and the base goes directly to the pin. BZ buzzes when pin is low.

Should the BZ be connected to the ZX the same way?

Switches are currently connected thusly:
+5Volts to resistor (10k) to one pole of switch. this pole is also conneted to the pin of the ZX. Other side of switch to Gnd giving 1 on pin when SW is open and 0 when closed.

Should the switches be connected the same way? How should I configure the pins?

Any enlightenment will be appreciated.


Vic

[dkinzer]

[victorf]

Don,

Thanks for your reply. You are correct about the BZ connection. Im my current app it DOES have a 10K resistor from the base to the pin. I just stupidly left it off the discussion. My "old" brain sometimes forgets the details. I should have looked at the schematic before inquiring.

Vic