--- a/FC-handset-spec	Sun Jun 13 04:57:31 2021 +0000
+++ b/FC-handset-spec	Sun Jun 13 05:27:45 2021 +0000
@@ -1404,3 +1404,17 @@
 Instead our Venus board will feature both LPG and PWL LEDs (i.e., LEDs
 controlled by the respective Calypso outputs) exactly like D-Sample, and either
 of these LEDs can be used to simulate vibrator on/off state.
+
+3.10. Host computer interface
+
+The host interface model on FC Venus will need to follow that of section 1.12.
+More specifically, our Venus board will implement the mobile side of the "wall"
+between USB and mobile power domains, complete with all provisions of section
+1.12.2 for the mobile side, whereas the USB domain is already implemented on our
+DUART28 adapter board.  The two domains will be interconnected with a ribbon
+cable in the FC Venus lab bench setup.  The 10-pin DUART header will have our
+standardized FreeCalypso DUART pinout.
+
+Also following the principal design of section 1.12.3, there will be a 3-pin
+header on the Venus board bringing out RPWON, nTESTRESET and GND, to be
+connected to the boot control header on DUART28C.