HP9816 PAL16L8

[Chuck Guzis]

On 6/11/19 11:40 AM, Paul Berger via cctalk wrote:
>
> Well in this case I have Mr Duell's schematic to go by to determine what
> is input an what is output.  For the 16L8 tristate is an available
> output option that you would need to specify in PLD design and I believe
> can be selected individually for each output.  In the case of this HAL
> it would seem likely that pin 11 tristates all outputs but output 0 at
> least when pin 11 is low the output from all the rest is high but I did
> not test for tristate as it does not matter in this case since pin 11 is
> permanently tied high.

That's nice; but in my case, I was sent a couple of PALs to clone
without a hint of their origin.   So the PAL was essentially a black box
and the task was to come up with a box that behaved similarly.

--Chuck