"I connected an analogue multimeter to the port pins, particularly D1,which is the Clock, hoping to see some deviations"

OK you have done it once - but don't repeat the mistake again! Just for a moment workout the following :

1. The frequency of the clock pulse that you are expecting to see. If it is going to be a single pulse then its duration

2. The average response time of your analog DMM.

3. The loading effect that your DMM will have on the port ( these have values like 20 kOhm/V typically)

The mistake will become evident.

In the absence of a scope you have to get much more innovative - like for instance one could wire up a LED to the output of some TTL or CMOS gate IC and feed the D1 signal to it. Just make sure that the gate is capable of driving the LED. Much better than a DMM for the job.

Raghu