Add QNA driver patch. Update several README files.

Author: pkoning2

README.md

@@ -8,5 +8,5 @@ Current contents:
 * Fonts
 * TECO
 * DECnet/E related items
-* Patches (ONLPAT command files to patch various known bugs)
+* RSTS/E and DECnet/E patches (ONLPAT command files to patch various known bugs)
 * NTP (RSTS NTP protocol client)

decnete/README.md

@@ -5,3 +5,7 @@ Everything here is for DECnet/E V4, RSTS/E V10.1 unless otherwise stated.
 1. `evtlog.tsk` -- the standard evtlog with Y2K bugs fixed and support for events that reference TT (async DDCMP) lines/circuits.
 
 2. `ncp.tsk` -- the standard NCP program with TT (async DDCMP) support added.  Refer to file `ncp.txt` for more information.
+
+3. `async-rsts.txt` -- documentation of the asynchronous DDCMP support in RSTS.
+
+4. `async.fth` -- a utility to turn terminal lines on and off in async DDCMP mode.

ntp/README.md

@@ -16,10 +16,9 @@ using the `broadcast` statement in the chrony.conf file.  I believe
 "ntpd" can also do this but I have not tested that.
 
 Please note:
-1. There appears to be a problem with the RSTS QNA driver; NTP does not
-receive anything on a QNA.
-2. NTP works on the UNA but it requires patches.  Be sure to install
-the patch in "patches/xedvr.cmd".
+
+Both RSTS Ethernet drivers have bugs that require patches.  Be sure to install
+the patch in `patches/xedvr.cmd` and/or `patches/xhdvr.cmd`.
 
 Contents:
 * ntp.c -- the main program.
@@ -33,7 +32,11 @@ Contents:
 ## Building
 
 You can use the prebuilt `ntp.tsk` but it's easy to build from source if you
-prefer.  You need DEC C for this.  To build, do `@build.com`.
+prefer.  You need DEC C for this.  To build, do `@build.com`.  Note that the
+code defaults to 60 Hz clock frequency.  To use a different value, supply the
+definition when compiling `tzutil.c`, for example:
+
+    cc /define="HERTZ 50" tzutil
 
 ## Installing
 

patches/xhdvr.cmd

@@ -0,0 +1,30 @@
+! Fix issues with DEQNA driver
+!
+! This fixes two errors in the loading of the multicast address list.
+!
+!  This is a Monitor patch, developed for V10.1; it might work on older versions.
+!
+!  Paul Koning, 20-Nov-23
+!
+File to patch? <LF>
+Module name? QNA
+Base address? XHDVRM@OVR
+Offset address? 4550
+ Base	Offset  Old     New?
+??????	004550	071027	? 4737
+??????	004552	000006	? QNAPAT@OVR
+??????	004554	012601	? ^Z
+Offset address? 4574
+ Base	Offset  Old     New?
+??????	004574	012424	? 12524
+??????	004576	077004	? ^Z
+Offset address? ^Z
+Base address? QNAPAT@OVR
+Offset address? 0
+ Base	Offset  Old     New?
+??????	000000	000000	? 10001
+??????	000002	000000	? 5000
+??????	000004	000000	? 71027
+??????	000006	000000	? 6
+??????	000010	000000	? 207
+??????	000012	000000	? ^C