HI nanofrog ,
In teardown of the 1054Z you can see that there are pads (circled with red by me on Dave's pic) for one FPGA and one memory chip that serves as the interface for logic analyzer ( from connector that is already empty ).
In my version of the board as you can see in my pic , there are no more pads for IC interface but pads for connector are in their place and they leads to FPGA ( Xilinx ) . So this make me to think that they are chosen to simplify the design of the logic analyzer (mostly like by economic reasons) . This make more easy to mod this scope by adding a connector and some voltage regulators , than solder BGA components ...
The firmware is the same for 1054Z and for 1074Z Plus , so this is not a problem . Biggest problem is finding values for the missing discrete components and finding a way for adding a button and cutting a hole in the front mask . For the LA button are contacts on the keyboard , even with its own functional LED .
Yes , is better to have a separate logic analyzer . A clone of Saleae cost 18 S on Ebay , but mod is justified by itself ...
By ,