Sorta? Not all the signals are available, depending on the level of integration. OTOH, modern hardware also frequently has test support via things like JTAG, wh

Sorta? Not all the signals are available, depending on the level of integration. OTOH, modern hardware also frequently has test support via things like JTAG, which can give you a ton of information and/or control the device directly. For instance, there's ChipScope from Xilinx (https://www.xilinx.com/products/design-tools/chipscopepro.html https://www.xilinx.com/products/design-tools/chipscopepro.ht...) which allows you to debug your FPGA hardware from outside without wasting a ton of pins. It's halfway between poking the board with an oscilloscope and running GDB, as it uses the metadata from your design to label things.