final touches for V0.791 release

- exptest/util.tcl: add proc et_tstline{0,1}; add et_exp el sub command
- console_starter: change simh port handling
- simh/setup_w11a_(max|min).scmd: adjust port handling
- docu updates

doc/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### Table of contents
 - Current [HEAD](#user-content-head)
+- Release [w11a_V0.791](#user-content-w11a_v0.791)
 - Release [w11a_V0.79](#user-content-w11a_v0.79)
 - Release [w11a_V0.78](#user-content-w11a_v0.78)
 - Release [w11a_V0.77](#user-content-w11a_v0.77)
@@ -24,6 +25,14 @@ The HEAD version shows the current development. No guarantees that
 software or firmware builds or that the documentation is consistent.
 The full set of tests is only run for tagged releases.
 
+### Summary
+### New features
+### Changes
+### Bug Fixes
+
+<!-- --------------------------------------------------------------------- -->
+---
+## <a id="w11a_v0.791">2022-04-24: [w11a_V0.791](https://github.com/wfjm/w11/releases/tag/w11a_V0.791) - rev 1229(wfjm)</a>
 ### Summary
 - drop Travis (now defunct)
 - add preliminary GitHub Actions support

doc/w11a_os_guide.md

@@ -18,9 +18,9 @@ process. The communication between the FPGA board and backend server can be via
 
 - Serial port
   - via an integrated USB-UART bridge
-    - on Arty A7, Basys3, Cmod A7 and Nexys4, and Nexys A7 with a `FT2232HQ`, 
+    - on Arty A7, Basys3, Cmod A7 and Nexys4, and Nexys A7 with an `FT2232HQ`, 
       allows up to 12M Baud
-    - on Nexys3 with a `FT232R`, allows up to 2M Baud
+    - on Nexys3 with an `FT232R`, allows up to 2M Baud
     - for all FTDI USB-UART it is essential to set them to `low latency` mode.
       That was the default for Linux kernels 2.6.32 to 4.4.52. Since about March
       2017, one gets kernels with 16 ms default latency again, thanks to
@@ -212,7 +212,7 @@ SimH to reflect the w11a setup as close as possible:
   - processor: 4 Mbyte memory (as on Nexys2, Nexys3,...)
   - periphery: in addition DZ11, RL11/RL02, RK70/RP06, TM11/TU10
 
-Startup scripts are provided with each oskit. They call the w11a_max
+Startup scripts are provided with each oskit. They call the `w11a_max`
 configuration, so will show in the emulator what w11a can do when
 finished.
 
@@ -223,7 +223,7 @@ All examples below use the same basic setup
          console_starter -s -d DL0 &
          console_starter -s -d DL1 &
 
-   **Note**: the -s ensures that the port numbers used by SimH are taken!
+   **Note**: the `-s` ensures that the port numbers used by SimH are taken!
 
 - start the simulator