--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sim-fpc-pasv/README	Tue Oct 25 03:17:34 2022 +0000
@@ -0,0 +1,8 @@
+The little board to be built in this directory is going to be an addition to
+the SIMtrace family: it will be a purely passive adapter, hosting a SIM socket
+and a connector for the existing FPC cables from Sysmocom SIMtrace2 kit.  This
+passive adapter will allow strictly non-invasive observation with an
+oscilloscope, particularly observation of SIM voltages being put out by
+different old phones, without any active components that need to be powered,
+that may be damaged by 5V phones, or that may alter SIM-ME interface behaviour
+through introduction of alien power supplies, pull-ups or shifters.