@Stefan Schippers what is the spice netlist to be filled inside ttl_ model.sym? I would like to modify code.sym

what is ttl_model.sym? I don't have it anywhere.

Sorry, it was tt_ models. I was following one YouTube video where code.sym is used with the name tt_ models.

ok, it is just a

code.sym

(or

code_shown.sym

which shows the value attribute, useful if you only have a short text therein). It is used to add some netlist code, typically

.include

lines,

.lib

lines or spice commands (like

.tran

....)