There was also a program called sneaky.exe which Xilinx wrote which IIRC patched the schematic file so the full version of VL4 could open it. VL4/LCA was a Xilinx-special crippled version of VL4 (a £20k product back then) which would import only Xilinx component libs. There are cracked versions of Viewlogic 4 / LCA and XACT 5 out there. I used it mostly for ECL logic I could not measure. I think I still have an original dongle and most of the stuff in my basement, including an XC2064 eval board. Their price soared to unexpected heights when production finally stopped. That explains the need for extra dongles. You usually had a heap of Compaq-286s to run multiple incarnations of apr to increase the odds of having a routed chip the next morning that really worked. I don't think this will work on a virtual machine. The software contained ugly hacks, like going back from protected to real mode a dozen of times per second just to interrogate the real mode mouse driver. So easy that is was an insult to people who would probably have a logic analyzer. The exact number said if you had only Futurenet?, Design implementation or the simulator, too. You had to apply a certain number of clock pulses until PE got active. The usual early Xilinx dongle had an 8 bit counter whose carry-out was read back to paper_empty.
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