Unable to use I9/Q0 as an Input

[NobodyYouKnow]

I am unable to use I9/Q0 (pin 19) as an input port. I am receiving the following message when I try to start the simulation:

"Error calculating a step More than one output is active on a wire, causing a short circuit." /OE (pin 11) is tied low.

Suggestions on how to proceed? Thanks.

[YulienPohl]

Your are right, as far as I know Digital dosent support in-out pins and thus I havent tested it enough.
However, I have found a solution for this, I have added an additional input pin for all of them and placed them one above the other in the circuit diagram so that they can also be operated in a sub-circuit.

Could you send me your hex file so that I can test the new input/output?

[NobodyYouKnow]

Here you go. I included the relevant DIG file as well. This is inspired by the MC6801 ROM dumper project. Thanks for the quick attention.

6801reader.zip

[YulienPohl]

I have updated the circuit and have not noticed any simulation errors so far.

Please note that if a pin has been programmed as an output, no input pin may be connected unless it is a three-state with default Z value.

[NobodyYouKnow]

Can you turn on the Discussions tab? Your excellent answers have led to more questions, and I don't it is appropriate to post them as a part of this issue. If you would like me to reach out to you another way, please let me know. Thanks.

[NobodyYouKnow]

Thank you for moving this to discussion. I expect I am running into my own limitations and not one of the reader.

Is it possible to display the fuse map as it has been "programmed" into the simulator? I can see the ROM just fine. This is about the fuses after the virtual programmer has run.

[YulienPohl]

It would be possible to visualize this, but it would look confusing and unclear.
Keep in mind that the GAL16V8 has 8 * 8 * 32 = 2048 fuses plus some control fuses.

I know that Digital does not support the simulation of partial circuits, as Logisim does, but the performance is higher.
If you are looking for a simpler variant where you can set the fuses yourself, take a look at Digital's examples\pld\GAL2v3.dig.