diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index d049eceb..cf1bdd7b 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -1,6 +1,7 @@
-
 Version 3.6
 -----------
+- MGG: Added COBOL language disk image
+- WDC: Added config options to PCF driver
 
 Version 3.5.1
 -------------
diff --git a/Doc/RomWBW Applications.pdf b/Doc/RomWBW Applications.pdf
index 7e48ba69..f480fe75 100644
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diff --git a/Doc/RomWBW Disk Catalog.pdf b/Doc/RomWBW Disk Catalog.pdf
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diff --git a/Doc/RomWBW Hardware.pdf b/Doc/RomWBW Hardware.pdf
index ab67c28e..b3a38686 100644
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diff --git a/Doc/RomWBW Introduction.pdf b/Doc/RomWBW Introduction.pdf
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diff --git a/Doc/RomWBW System Guide.pdf b/Doc/RomWBW System Guide.pdf
index 09b463e6..340d1332 100644
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diff --git a/Doc/RomWBW User Guide.pdf b/Doc/RomWBW User Guide.pdf
index f42545f4..e11b341c 100644
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diff --git a/ReadMe.md b/ReadMe.md
index d7176f23..5192d03c 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -7,7 +7,7 @@
 **RomWBW Introduction** \
 Version 3.6 \
 Wayne Warthen  ([wwarthen@gmail.com](mailto:wwarthen@gmail.com)) \
-21 May 2025
+23 May 2025
 
 # Overview
 
diff --git a/ReadMe.txt b/ReadMe.txt
index b6101e9b..2a73568e 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -1,6 +1,6 @@
 RomWBW Introduction
 Wayne Warthen (wwarthen@gmail.com)
-21 May 2025
+23 May 2025
 
 
 
diff --git a/Source/Doc/Hardware.md b/Source/Doc/Hardware.md
index 9aa01173..520779dc 100644
--- a/Source/Doc/Hardware.md
+++ b/Source/Doc/Hardware.md
@@ -40,14 +40,19 @@ KIO refers to a Zilog specific Serial/Parallel Counter/Timer (Z84C90).
 The RCBus Z180 & Z280 require a separate RAM/ROM memory module. There are two types
 of these modules, you must pick the correct ROM for your type of memory module:
 
-* The RCBus Z180 & Z280 require a separate RAM/ROM memory module. There are two types
-  of these modules, you must pick the correct ROM for your type of memory module:
-* The second type of RAM/ROM module has no bank switching logic – this is called
-  (“Native”) because the CPU itself provides the bank switching logic.
+* The first type of RAM/ROM module includes Z2 style memory bank
+  switching on the memory module itself.  This is called "External" (ext)
+  because the bank switching is external from the CPU itself.
+
+* The second type of RAM/ROM module has no bank switching logic on the
+  memory module.  Bank switching is implemented via the Z180 or Z280
+  MMU – this is called “Native” (nat) because the CPU itself provides
+  the bank switching logic.
 
 Only Z180 and Z280 CPUs have the ability to do bank switching in the
 CPU, so the ext/nat selection only applies to them.  Z80 CPUs have no
-built-in bank switching logic, so they are always configured for
+built-in bank switching logic, so they always require a RAM/ROM module
+with Z2 style bank switching and the ROMs are always configured for
 external bank switching.
 
 `\clearpage`{=latex}