Compiling this for the 16F628 seems to work OK. The timing
loop you have executes in 1 second @ 20MHz, and the whole
thing loops around over and over

Main movlw b'00000001'  << what is this for ? W gets over-
                                             << written by the 0X2c in
"delay"
 call Delay
 call Delay
 call Delay
 call Delay
 movlw b'00000000'           << ditto
 call Delay
 goto Main
 End

I thought it may be something to do with Cblock, but the RAM
in an 18Fxx2 starts at 0 doesn't it ?

As you've TRISed PortA are you trying to measure something
happening on a pin ? If this is being tried out in a chip you'd
need the other ports set, a CONFIG, and a check to see that
the PIC is actually running

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