What i did to debug my LCD troubles was make a delay routine of about a
second or two, then call it each time the enable line changes state, so i
could use a logic probe to diagnose things.

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On Fri, 14 May 1999, Jay Mielke wrote:

> Hi all,
> I am trying to get an Optrex 4X16 LCD to work (HD44780) using the code from
> Peter Ouwehand's home page.  The catch is I am using a 16C74A as opposed to
> the 16C84.  Has anyone else tried this?  I turn the circuit on and the first
> and third lines of the LCD are filled in with block characters, the second
> and fourth lines are blank.  I am using the full 8-bit interfacing.
> FRUSTRATION!!!!!!  Help me!! Help me!!!! I cannnnnn't seeeee!!!!!
>
> Thanx in advance
> Jay Mielke
>