[ischmitz]

The channel “Parallel” is a protocol decoder that uses the address lines to calculates a hexadecimal number. It makes the data more readable.

You don’t need clock or other inputs. Just sample the address signals A0 - A9 on the EPROM. If your init LJMP uses the same argument (check your EPROM content first three bytes) you only need A0 - A9 to confirm the LJMP takes place. That leaves one more digital line you may use for trigger on RST or something else.

I used 10Mhz sampling and no clock. If you don’t have a way to trigger off the RST line just sample for a coupe of seconds start the data collection, and power on. Then find when RST goes low in the data.


Check the EPROM content for the first three bytes and confirm the 8051 reads the first three bytes and jumps to the correct address.