diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index fc23271c..fc098d2c 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -64,6 +64,7 @@ Version 3.1.1
 - WBW: Add support for "romless" booting
 - L?N: Fixes for ZCPR-D&J (buffer overflow, default drive/user)
 - J?P: Add support for DS1501 RTC
+- LLS: Added a user defined mode for SD Card interfaces (not complete)
 
 Version 3.1
 -----------
diff --git a/Doc/ROM Applications.pdf b/Doc/ROM Applications.pdf
index 475d81ca..3918e320 100644
Binary files a/Doc/ROM Applications.pdf and b/Doc/ROM Applications.pdf differ
diff --git a/Doc/RomWBW Applications.pdf b/Doc/RomWBW Applications.pdf
index 92754f9c..6a85a2ef 100644
Binary files a/Doc/RomWBW Applications.pdf and b/Doc/RomWBW Applications.pdf differ
diff --git a/Doc/RomWBW Architecture.pdf b/Doc/RomWBW Architecture.pdf
index d6637aa1..a42e9920 100644
Binary files a/Doc/RomWBW Architecture.pdf and b/Doc/RomWBW Architecture.pdf differ
diff --git a/Doc/RomWBW Disk Catalog.pdf b/Doc/RomWBW Disk Catalog.pdf
index c27c2c94..d066df34 100644
Binary files a/Doc/RomWBW Disk Catalog.pdf and b/Doc/RomWBW Disk Catalog.pdf differ
diff --git a/Doc/RomWBW Getting Started.pdf b/Doc/RomWBW Getting Started.pdf
index 6fab4246..25190fd9 100644
Binary files a/Doc/RomWBW Getting Started.pdf and b/Doc/RomWBW Getting Started.pdf differ
diff --git a/ReadMe.md b/ReadMe.md
index 2a7f6fc5..2463e551 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -3,23 +3,23 @@
 ## Z80/Z180 System Software
 
 Version 3.1 Pre-release  
-05 Nov 2022
+10 Dec 2022
 
 Wayne Warthen <wwarthen@gmail.com>
 
 ### Download
 
--   [RomWBW Distribution
-    Package](https://github.com/wwarthen/RomWBW/releases)
+- [RomWBW Distribution
+  Package](https://github.com/wwarthen/RomWBW/releases)
 
 ### Related Pages
 
--   [RomWBW Architecture
-    Document](https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=software:firmwareos:romwbw:romwbw_architecture.pdf)
--   [RomWBW
-    Applications](https://www.retrobrewcomputers.org/doku.php?id=software:firmwareos:romwbw:apps)
--   [RomWBW
-    Errata](https://www.retrobrewcomputers.org/doku.php?id=software:firmwareos:romwbw:errata)
+- [RomWBW Architecture
+  Document](https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=software:firmwareos:romwbw:romwbw_architecture.pdf)
+- [RomWBW
+  Applications](https://www.retrobrewcomputers.org/doku.php?id=software:firmwareos:romwbw:apps)
+- [RomWBW
+  Errata](https://www.retrobrewcomputers.org/doku.php?id=software:firmwareos:romwbw:errata)
 
 # Overview
 
@@ -27,28 +27,28 @@ RomWBW provides a complete software system for a wide variety of
 hobbyist Z80/Z180 CPU-based systems produced by these developer
 communities:
 
--   [RetroBrew Computers](https://www.retrobrewcomputers.org)
--   [RC2014](https://rc2014.co.uk)
--   [retro-comp](https://groups.google.com/forum/#!forum/retro-comp)
+- [RetroBrew Computers](https://www.retrobrewcomputers.org)
+- [RC2014](https://rc2014.co.uk)
+- [retro-comp](https://groups.google.com/forum/#!forum/retro-comp)
 
 General features include:
 
--   Banked memory services for several banking designs
--   Disk drivers for RAM, ROM, Floppy, IDE, CF, and SD
--   Serial drivers including UART (16550-like), ASCI, ACIA, SIO
--   Video drivers including TMS9918, SY6545, MOS8563, HD6445
--   Real time clock drivers including DS1302, BQ4845
--   Multiple OS support including CP/M 2.2, ZSDOS, CP/M 3, ZPM3
--   Built-in VT-100 terminal emulation support
+- Banked memory services for several banking designs
+- Disk drivers for RAM, ROM, Floppy, IDE, CF, and SD
+- Serial drivers including UART (16550-like), ASCI, ACIA, SIO
+- Video drivers including TMS9918, SY6545, MOS8563, HD6445
+- Real time clock drivers including DS1302, BQ4845
+- Multiple OS support including CP/M 2.2, ZSDOS, CP/M 3, ZPM3
+- Built-in VT-100 terminal emulation support
 
 RomWBW is distributed as both source code and pre-built ROM and disk
 images. Some of the provided software can be launched directly from the
 ROM firmware itself:
 
--   System Monitor
--   Operating Systems (CP/M 2.2, ZSDOS)
--   ROM BASIC (Nascom BASIC and Tasty BASIC)
--   ROM Forth
+- System Monitor
+- Operating Systems (CP/M 2.2, ZSDOS)
+- ROM BASIC (Nascom BASIC and Tasty BASIC)
+- ROM Forth
 
 A dynamic disk drive letter assignment mechanism allows mapping
 operating system drive letters to any available disk media.
@@ -209,10 +209,10 @@ modular approach to implementing device drivers and presenting devices
 to the operating system. In general, all devices are classified as one
 of the following:
 
--   Disk (Hard Disk, CF Card, SD Card, RAM/ROM Disk, etc.)
--   Character (Serial Ports, Parallel Ports, etc.)
--   Video (Video Display/Keyboard Interfaces)
--   RTC/NVRAM (Real Time Clock, Non-volatile RAM)
+- Disk (Hard Disk, CF Card, SD Card, RAM/ROM Disk, etc.)
+- Character (Serial Ports, Parallel Ports, etc.)
+- Video (Video Display/Keyboard Interfaces)
+- RTC/NVRAM (Real Time Clock, Non-volatile RAM)
 
 HBIOS uses the concept of unit numbers to present a complex set of
 hardware devices to the operating system. As an example, a typical
@@ -747,17 +747,17 @@ most stable and you are less likely to encounter problems.
 
 ### Notes
 
--   You can change media, but it must be done while at the OS command
-    prompt and you **must** warm start CP/M by pressing ctrl-c. This is
-    a CP/M 2.2 constraint and is well documented in the DRI manuals.
+- You can change media, but it must be done while at the OS command
+  prompt and you **must** warm start CP/M by pressing ctrl-c. This is a
+  CP/M 2.2 constraint and is well documented in the DRI manuals.
 
--   The original versions of DDT, DDTZ, and ZSID used the RST 38 vector
-    which conflicts with interrupt mode 1 use of this vector. The DDT,
-    DDTZ, and ZSID applications in RomWBW have been modified to use RST
-    30 to avoid this issue.
+- The original versions of DDT, DDTZ, and ZSID used the RST 38 vector
+  which conflicts with interrupt mode 1 use of this vector. The DDT,
+  DDTZ, and ZSID applications in RomWBW have been modified to use RST 30
+  to avoid this issue.
 
--   Z-System applications will not run under CP/M 2.2. For example, the
-    `LDDS` date stamper will not run.
+- Z-System applications will not run under CP/M 2.2. For example, the
+  `LDDS` date stamper will not run.
 
 ## ZSDOS 1.1
 
@@ -775,14 +775,13 @@ Manual.pdf”).
 
 ### Notes
 
--   Although most CP/M 2.2 applications will run under Z-System, some
-    may not work as expected. The best example is PIP which is not aware
-    of the ZSDOS paths and will fail in some scenarios (use `COPY`
-    instead).
+- Although most CP/M 2.2 applications will run under Z-System, some may
+  not work as expected. The best example is PIP which is not aware of
+  the ZSDOS paths and will fail in some scenarios (use `COPY` instead).
 
--   Although ZSDOS can recognize a media change in some cases, it will
-    not always work. You should only change media at a command prompt
-    and be sure to warm start the OS with a ctrl-c.
+- Although ZSDOS can recognize a media change in some cases, it will not
+  always work. You should only change media at a command prompt and be
+  sure to warm start the OS with a ctrl-c.
 
 ## NZCOM Automatic Z-System
 
@@ -803,8 +802,8 @@ RomWBW Doc directory.
 
 ### Notes
 
--   There is no `DIR` command, you must use `SDZ` instead. If you don’t
-    like this, look into the ALIAS facility.
+- There is no `DIR` command, you must use `SDZ` instead. If you don’t
+  like this, look into the ALIAS facility.
 
 ## Digital Research CP/M 3
 
@@ -820,19 +819,18 @@ tracks. `CPMLDR.SYS` chain loads `CPM3.SYS`.
 
 ### Notes
 
--   The `DATE` command cannot yet be used to **set** the RTC. The RTC is
-    used to read the current date/time for file stamping, etc. You can
-    use the `RTC` app to set the RTC clock.
+- The `DATE` command cannot yet be used to **set** the RTC. The RTC is
+  used to read the current date/time for file stamping, etc. You can use
+  the `RTC` app to set the RTC clock.
 
--   The `COPYSYS` command described in the DRI CP/M 3 documentation is
-    not provided with RomWBW. The RomWBW `SYSCOPY` command is used
-    instead.
+- The `COPYSYS` command described in the DRI CP/M 3 documentation is not
+  provided with RomWBW. The RomWBW `SYSCOPY` command is used instead.
 
--   Although CP/M 3 is generally able to run CP/M 2.2 programs, this is
-    not universally true. This is especially true of the utility
-    programs included with the operating system. For example, the
-    `SUBMIT` program of CP/M 3 is completely different from the `SUBMIT`
-    program of CP/M 2.2.
+- Although CP/M 3 is generally able to run CP/M 2.2 programs, this is
+  not universally true. This is especially true of the utility programs
+  included with the operating system. For example, the `SUBMIT` program
+  of CP/M 3 is completely different from the `SUBMIT` program of CP/M
+  2.2.
 
 ## Simeon Cran’s ZPM3
 
@@ -844,14 +842,14 @@ tracks of the disk.
 
 ### Notes
 
--   `ZPMLDR` is equivalent to CPMLDR. Both are included. Previously,
-    ZPMLDR had issues that prevented it from properly booting RomWBW
-    ZPM3. However, those issues have been resolved.
+- `ZPMLDR` is equivalent to CPMLDR. Both are included. Previously,
+  ZPMLDR had issues that prevented it from properly booting RomWBW ZPM3.
+  However, those issues have been resolved.
 
--   The ZPM operating system is contained in the file called CPM3.SYS
-    which is confusing, but this is as intended by the ZPM3
-    distribution. I believe it was done this way to make it easier for
-    users to transition from CP/M 3 to ZPM3.
+- The ZPM operating system is contained in the file called CPM3.SYS
+  which is confusing, but this is as intended by the ZPM3 distribution.
+  I believe it was done this way to make it easier for users to
+  transition from CP/M 3 to ZPM3.
 
 ## FreeRTOS
 
@@ -1036,10 +1034,10 @@ images.
 While John is likely to enhance UNA over time, there are currently a few
 things that UNA does not support:
 
--   Floppy Drives
--   Terminal Emulation
--   Zeta 1, N8, RC2014, Easy Z80, and Dyno Systems
--   Some older support boards
+- Floppy Drives
+- Terminal Emulation
+- Zeta 1, N8, RC2014, Easy Z80, and Dyno Systems
+- Some older support boards
 
 The UNA version embedded in RomWBW is the latest production release of
 UNA. RomWBW will be updated with John’s upcoming UNA release with
@@ -1145,89 +1143,86 @@ If the disk is bootable, you need to update the system image on the disk
 using the procedure described below corresponsing to the operating
 system on your disk.
 
--   **CP/M 2.2**
+- **CP/M 2.2**
 
-    Boot to CP/M 2.2 from ROM, then use `SYSCOPY` to update the system
-    image on **all** CP/M 2.2 boot disks/slices. The CP/M 2.2 system
-    image is called CPM.SYS and is found on the ROM disk. For example:
+  Boot to CP/M 2.2 from ROM, then use `SYSCOPY` to update the system
+  image on **all** CP/M 2.2 boot disks/slices. The CP/M 2.2 system image
+  is called CPM.SYS and is found on the ROM disk. For example:
 
-    `B>SYSCOPY C:=CPM.SYS`
+  `B>SYSCOPY C:=CPM.SYS`
 
--   **ZSDOS**
+- **ZSDOS**
 
-    Boot to Z-System from ROM, then use `SYSCOPY` to update the system
-    image on **all** ZSDOS boot disks/slices. The ZSDOS system image is
-    called ZSYS.SYS and is found on the ROM disk. For example:
+  Boot to Z-System from ROM, then use `SYSCOPY` to update the system
+  image on **all** ZSDOS boot disks/slices. The ZSDOS system image is
+  called ZSYS.SYS and is found on the ROM disk. For example:
 
-    `B>SYSCOPY C:=ZSYS.SYS`
+  `B>SYSCOPY C:=ZSYS.SYS`
 
--   **NZCOM**
+- **NZCOM**
 
-    NZCOM runs on top of either CP/M 2.2 or ZSDOS. By default, the
-    RomWBW disk image for NZCOM uses ZSDOS. Follow the corresponding
-    procedure above to update the system image on the NZCOM boot
-    disks/slices.
+  NZCOM runs on top of either CP/M 2.2 or ZSDOS. By default, the RomWBW
+  disk image for NZCOM uses ZSDOS. Follow the corresponding procedure
+  above to update the system image on the NZCOM boot disks/slices.
 
--   **CP/M 3**
+- **CP/M 3**
 
-    CP/M 3 uses a multi-step boot process involving multiple files. The
-    CP/M 3 boot files are not included on the ROM disk due to space
-    constraints. You will need to transfer the files to your system from
-    the RomWBW distribution directory Binary\CPM3.
+  CP/M 3 uses a multi-step boot process involving multiple files. The
+  CP/M 3 boot files are not included on the ROM disk due to space
+  constraints. You will need to transfer the files to your system from
+  the RomWBW distribution directory Binary\CPM3.
 
-    After this is done, you will need to use `SYSCOPY` to place the CP/M
-    3 loader image on the boot tracks of all CP/M 3 boot disks/slices.
-    The loader image is called `CPMLDR.SYS`. You must then copy (at a
-    minimum) `CPM3.SYS` and `CCP.COM` onto the disk/slice. Assuming you
-    copied the CP/M 3 boot files onto your RAM disk at A:, you would
-    use:
+  After this is done, you will need to use `SYSCOPY` to place the CP/M 3
+  loader image on the boot tracks of all CP/M 3 boot disks/slices. The
+  loader image is called `CPMLDR.SYS`. You must then copy (at a minimum)
+  `CPM3.SYS` and `CCP.COM` onto the disk/slice. Assuming you copied the
+  CP/M 3 boot files onto your RAM disk at A:, you would use:
 
-        A>B:SYSCOPY C:=CPMLDR.SYS
-        A>B:COPY CPM3.SYS C:
-        A>B:COPY CCP.COM C:
+      A>B:SYSCOPY C:=CPMLDR.SYS
+      A>B:COPY CPM3.SYS C:
+      A>B:COPY CCP.COM C:
 
--   **ZPM3**
+- **ZPM3**
 
-    ZPM3 uses a multi-step boot process involving multiple files. The
-    ZPM3 boot files are not included on the ROM disk due to space
-    constraints. You will need to transfer the files to your system from
-    the RomWBW distribution directory Binary\ZPM3.
+  ZPM3 uses a multi-step boot process involving multiple files. The ZPM3
+  boot files are not included on the ROM disk due to space constraints.
+  You will need to transfer the files to your system from the RomWBW
+  distribution directory Binary\ZPM3.
 
-    After this is done, you will need to use `SYSCOPY` to place the ZPM3
-    loader image on the boot tracks of all ZPM3 boot disks/slices. The
-    loader image is called `ZPMLDR.SYS`. You must then copy (at a
-    minimum) `CPM3.SYS`, `ZCCP.COM`, `ZINSTAL.ZPM`, and `STARTZPM.COM`
-    onto the disk/slice. Assuming you copied the ZPM3 boot files onto
-    your RAM disk at A:, you would use:
+  After this is done, you will need to use `SYSCOPY` to place the ZPM3
+  loader image on the boot tracks of all ZPM3 boot disks/slices. The
+  loader image is called `ZPMLDR.SYS`. You must then copy (at a minimum)
+  `CPM3.SYS`, `ZCCP.COM`, `ZINSTAL.ZPM`, and `STARTZPM.COM` onto the
+  disk/slice. Assuming you copied the ZPM3 boot files onto your RAM disk
+  at A:, you would use:
 
-        A>B:SYSCOPY C:=ZPMLDR.SYS
-        A>B:COPY CPM3.SYS C:
-        A>B:COPY ZCCP.COM C:
-        A>B:COPY ZINSTAL.ZPM C:
-        A>B:COPY STARTZPM.COM C:
+      A>B:SYSCOPY C:=ZPMLDR.SYS
+      A>B:COPY CPM3.SYS C:
+      A>B:COPY ZCCP.COM C:
+      A>B:COPY ZINSTAL.ZPM C:
+      A>B:COPY STARTZPM.COM C:
 
-    You may be wondering if the reference to `CPM3.SYS` is a typo. It is
-    not. The ZPM3 main system code file is called `CPM3.SYS` which is
-    the same name as CP/M 3 uses, but the file contents are not the
-    same.
+  You may be wondering if the reference to `CPM3.SYS` is a typo. It is
+  not. The ZPM3 main system code file is called `CPM3.SYS` which is the
+  same name as CP/M 3 uses, but the file contents are not the same.
 
 Finally, if you have copies of any of the RomWBW custom applications on
 your hard disk, you need to update them with the latest copies. The
 following applications are found on your ROM disk. Use COPY to copy them
 over any older versions of the app on your disk:
 
--   ASSIGN.COM
--   SYSCOPY.COM
--   MODE.COM
--   FDU.COM (was FDTST.COM)
--   FORMAT.COM
--   XM.COM
--   FLASH.COM
--   FDISK80.COM
--   TALK.COM
--   RTC.COM
--   TIMER.COM
--   INTTEST.COM
+- ASSIGN.COM
+- SYSCOPY.COM
+- MODE.COM
+- FDU.COM (was FDTST.COM)
+- FORMAT.COM
+- XM.COM
+- FLASH.COM
+- FDISK80.COM
+- TALK.COM
+- RTC.COM
+- TIMER.COM
+- INTTEST.COM
 
 For example: `B>COPY ASSIGN.COM C:`
 
@@ -1236,8 +1231,8 @@ you are using any of these you will need to transfer them to your system
 and then update all copies. These applications are found in the
 Binary\Apps directory of the distribution and in all of the disk images.
 
--   FAT.COM
--   TUNE.COM
+- FAT.COM
+- TUNE.COM
 
 ## System Update
 
@@ -1251,11 +1246,11 @@ and CP/M system.
 A System Update may be more favorable than a System Upgrade in cases
 such as:
 
--   Overwriting of the ROM drive is not desired.
--   Space is unavailable to hold a full ROMWBW ROM.
--   To mimimize time taken to transfer and flash a full ROM.
--   Configuration changes are only minor and do not impact disk
-    applications.
+- Overwriting of the ROM drive is not desired.
+- Space is unavailable to hold a full ROMWBW ROM.
+- To mimimize time taken to transfer and flash a full ROM.
+- Configuration changes are only minor and do not impact disk
+  applications.
 
 The ROMWBW build process generates a system upgrade file along with the
 normal ROM image and can be identified by the extension “.upd”. It will
@@ -1306,22 +1301,22 @@ continue the maintenance of these applications and they have become
 unusable due to changes within RomWBW. As of RomWBW 2.6, these
 applications are no longer provided.
 
--   David Giles contributed support for the CSIO support in the SD Card
-    driver.
--   Ed Brindley contributed some of the code that supports the RC2014
-    platform.
--   Phil Summers contributed the Forth and BASIC adaptations in ROM, the
-    AY-3-8910 sound driver as well as a long list of general code
-    enhancements.
--   Phillip Stevens contributed support for FreeRTOS.
--   Curt Mayer contributed the original Linux / MacOS build process.
--   UNA BIOS and FDISK80 are the products of John Coffman.
--   FLASH4 is a product of Will Sowerbutts.
--   CLRDIR is a product of Max Scane.
--   Tasty Basic is a product of Dimitri Theulings.
--   Dean Netherton contributed the sound driver interface and the
-    SN76489 sound driver.
--   The RomWBW Disk Catalog document was produced by Mykl Orders.
+- David Giles contributed support for the CSIO support in the SD Card
+  driver.
+- Ed Brindley contributed some of the code that supports the RC2014
+  platform.
+- Phil Summers contributed the Forth and BASIC adaptations in ROM, the
+  AY-3-8910 sound driver as well as a long list of general code
+  enhancements.
+- Phillip Stevens contributed support for FreeRTOS.
+- Curt Mayer contributed the original Linux / MacOS build process.
+- UNA BIOS and FDISK80 are the products of John Coffman.
+- FLASH4 is a product of Will Sowerbutts.
+- CLRDIR is a product of Max Scane.
+- Tasty Basic is a product of Dimitri Theulings.
+- Dean Netherton contributed the sound driver interface and the SN76489
+  sound driver.
+- The RomWBW Disk Catalog document was produced by Mykl Orders.
 
 Contributions of all kinds to RomWBW are very welcome.
 
@@ -1372,12 +1367,11 @@ All contributions to RomWBW are subject to this license.
 The best way to get assistance with RomWBW or any aspect of the
 RetroBrew Computers projects is via the community forums:
 
--   [RetroBrew Computers
-    Forum](https://www.retrobrewcomputers.org/forum/)
--   [RC2014 Google
-    Group](https://groups.google.com/forum/#!forum/rc2014-z80)
--   [retro-comp Google
-    Group](https://groups.google.com/forum/#!forum/retro-comp)
+- [RetroBrew Computers Forum](https://www.retrobrewcomputers.org/forum/)
+- [RC2014 Google
+  Group](https://groups.google.com/forum/#!forum/rc2014-z80)
+- [retro-comp Google
+  Group](https://groups.google.com/forum/#!forum/retro-comp)
 
 Submission of issues and bugs are welcome at the [RomWBW GitHub
 Repository](https://github.com/wwarthen/RomWBW).
diff --git a/ReadMe.txt b/ReadMe.txt
index 213fb771..b9cafc21 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -1,6 +1,6 @@
 RomWBW Getting Started
 Wayne Warthen (mailto:wwarthen@gmail.com)
-05 Nov 2022
+10 Dec 2022
 
 
 
@@ -17,7 +17,7 @@ RomWBW
 Z80/Z180 System Software
 
 Version 3.1 Pre-release
-05 Nov 2022
+10 Dec 2022
 
 Wayne Warthen wwarthen@gmail.com
 
diff --git a/Source/HBIOS/cfg_dyno.asm b/Source/HBIOS/cfg_dyno.asm
index 8de94ae0..5fc529be 100644
--- a/Source/HBIOS/cfg_dyno.asm
+++ b/Source/HBIOS/cfg_dyno.asm
@@ -174,7 +174,7 @@ PPIDE0A8BIT	.EQU	FALSE		; PPIDE 0A (MASTER): 8 BIT XFER
 PPIDE0B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_PPI	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_PPI	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_ezz80.asm b/Source/HBIOS/cfg_ezz80.asm
index 2f476e23..0e63f9c7 100644
--- a/Source/HBIOS/cfg_ezz80.asm
+++ b/Source/HBIOS/cfg_ezz80.asm
@@ -211,7 +211,7 @@ PPIDE0A8BIT	.EQU	FALSE		; PPIDE 0A (MASTER): 8 BIT XFER
 PPIDE0B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_PPI	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_PPI	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_master.asm b/Source/HBIOS/cfg_master.asm
index 259e650d..82a45e48 100644
--- a/Source/HBIOS/cfg_master.asm
+++ b/Source/HBIOS/cfg_master.asm
@@ -279,7 +279,7 @@ PPIDE2A8BIT	.EQU	FALSE		; PPIDE 2A (MASTER): 8 BIT XFER
 PPIDE2B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_NONE	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_NONE	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_mbc.asm b/Source/HBIOS/cfg_mbc.asm
index 4057e40a..096c85ac 100644
--- a/Source/HBIOS/cfg_mbc.asm
+++ b/Source/HBIOS/cfg_mbc.asm
@@ -208,7 +208,7 @@ PPIDE2A8BIT	.EQU	FALSE		; PPIDE 2A (MASTER): 8 BIT XFER
 PPIDE2B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_JUHA	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_JUHA	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_mk4.asm b/Source/HBIOS/cfg_mk4.asm
index f04934e9..74d1a648 100644
--- a/Source/HBIOS/cfg_mk4.asm
+++ b/Source/HBIOS/cfg_mk4.asm
@@ -207,7 +207,7 @@ PPIDE2A8BIT	.EQU	FALSE		; PPIDE 2A (MASTER): 8 BIT XFER
 PPIDE2B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	TRUE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_MK4	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_MK4	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_rcz180.asm b/Source/HBIOS/cfg_rcz180.asm
index 1e477427..9cdd961f 100644
--- a/Source/HBIOS/cfg_rcz180.asm
+++ b/Source/HBIOS/cfg_rcz180.asm
@@ -224,7 +224,7 @@ PPIDE2A8BIT	.EQU	FALSE		; PPIDE 2A (MASTER): 8 BIT XFER
 PPIDE2B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_MT	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_MT	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	2		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_rcz280.asm b/Source/HBIOS/cfg_rcz280.asm
index 6599438d..ab3ced93 100644
--- a/Source/HBIOS/cfg_rcz280.asm
+++ b/Source/HBIOS/cfg_rcz280.asm
@@ -239,7 +239,7 @@ PPIDE2A8BIT	.EQU	FALSE		; PPIDE 2A (MASTER): 8 BIT XFER
 PPIDE2B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_MT	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_MT	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	2		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_rcz80.asm b/Source/HBIOS/cfg_rcz80.asm
index 3cb827ff..23ac6d40 100644
--- a/Source/HBIOS/cfg_rcz80.asm
+++ b/Source/HBIOS/cfg_rcz80.asm
@@ -228,7 +228,7 @@ PPIDE2A8BIT	.EQU	FALSE		; PPIDE 2A (MASTER): 8 BIT XFER
 PPIDE2B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_MT	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_MT	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	2		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_rph.asm b/Source/HBIOS/cfg_rph.asm
index 1559a52f..2cd6cf62 100644
--- a/Source/HBIOS/cfg_rph.asm
+++ b/Source/HBIOS/cfg_rph.asm
@@ -209,7 +209,7 @@ PPIDE2A8BIT	.EQU	FALSE		; PPIDE 2A (MASTER): 8 BIT XFER
 PPIDE2B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_CSIO	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_CSIO	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	RPH_PPI0	; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_sbc.asm b/Source/HBIOS/cfg_sbc.asm
index 00bd9613..79d2862c 100644
--- a/Source/HBIOS/cfg_sbc.asm
+++ b/Source/HBIOS/cfg_sbc.asm
@@ -208,7 +208,7 @@ PPIDE2A8BIT	.EQU	FALSE		; PPIDE 2A (MASTER): 8 BIT XFER
 PPIDE2B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_JUHA	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_JUHA	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_scz180.asm b/Source/HBIOS/cfg_scz180.asm
index 5a001c15..ca9a4d71 100644
--- a/Source/HBIOS/cfg_scz180.asm
+++ b/Source/HBIOS/cfg_scz180.asm
@@ -219,7 +219,7 @@ PPIDE2A8BIT	.EQU	FALSE		; PPIDE 2A (MASTER): 8 BIT XFER
 PPIDE2B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	TRUE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_SC	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_SC	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_zeta.asm b/Source/HBIOS/cfg_zeta.asm
index 38f0454d..09d3f31a 100644
--- a/Source/HBIOS/cfg_zeta.asm
+++ b/Source/HBIOS/cfg_zeta.asm
@@ -152,7 +152,7 @@ PPIDE0A8BIT	.EQU	FALSE		; PPIDE 0A (MASTER): 8 BIT XFER
 PPIDE0B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_PPI	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_PPI	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/cfg_zeta2.asm b/Source/HBIOS/cfg_zeta2.asm
index ad82124a..48c5532d 100644
--- a/Source/HBIOS/cfg_zeta2.asm
+++ b/Source/HBIOS/cfg_zeta2.asm
@@ -163,7 +163,7 @@ PPIDE0A8BIT	.EQU	FALSE		; PPIDE 0A (MASTER): 8 BIT XFER
 PPIDE0B8BIT	.EQU	FALSE		; PPIDE 0B (SLAVE): 8 BIT XFER
 ;
 SDENABLE	.EQU	FALSE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
-SDMODE		.EQU	SDMODE_PPI	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT]
+SDMODE		.EQU	SDMODE_PPI	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC|MT|USR]
 SDPPIBASE	.EQU	$60		; SD: BASE I/O ADDRESS OF PPI FOR PPI MODDE
 SDCNT		.EQU	1		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
 SDTRACE		.EQU	1		; SD: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/sd.asm b/Source/HBIOS/sd.asm
index 360e823b..ba8ad7f6 100644
--- a/Source/HBIOS/sd.asm
+++ b/Source/HBIOS/sd.asm
@@ -128,6 +128,7 @@ SD_CLK		.EQU	%00000010	; RTC:1 IS CLOCK
 SD_DI		.EQU	%00000001	; RTC:0 IS DATA IN (CARD <- CPU)
 SD_DO		.EQU	%10000000	; RTC:7 IS DATA OUT (CARD -> CPU)
 SD_IOBASE	.EQU	SD_OPRREG	; IOBASE
+SD_INVCS	.EQU	FALSE		; INVERT CS
 ;
 RTCDEF		.SET	RTCDEF | SD_OPRDEF	; SET DEFAULT IN HBIOS MAINLINE
 #ENDIF
@@ -143,6 +144,7 @@ SD_CLK		.EQU	%00000010	; RTC:1 IS CLOCK
 SD_DI		.EQU	%00000001	; RTC:0 IS DATA IN (CARD <- CPU)
 SD_DO		.EQU	%01000000	; RTC:6 IS DATA OUT (CARD -> CPU)
 SD_IOBASE	.EQU	SD_OPRREG	; IOBASE
+SD_INVCS	.EQU	FALSE		; INVERT CS
 ;
 RTCDEF		.SET	RTCDEF | SD_OPRDEF	; SET DEFAULT IN HBIOS MAINLINE
 #ENDIF
@@ -156,6 +158,7 @@ SD_CS0		.EQU	%00000100	; RTC:2 IS SELECT
 SD_CNTR		.EQU	Z180_CNTR
 SD_TRDR		.EQU	Z180_TRDR
 SD_IOBASE	.EQU	SD_OPRREG	; IOBASE
+SD_INVCS	.EQU	FALSE		; INVERT CS
 ;
 RTCDEF		.SET	RTCDEF | SD_OPRDEF	; SET DEFAULT IN HBIOS MAINLINE
 #ENDIF
@@ -174,6 +177,7 @@ SD_CLK		.EQU	%00000010	; PPIC:1 IS CLOCK
 SD_DI		.EQU	%00000001	; PPIC:0 IS DATA IN (CARD <- CPU)
 SD_DO		.EQU	%10000000	; PPIB:7 IS DATA OUT (CARD -> CPU)
 SD_IOBASE	.EQU	SD_PPIBASE	; IOBASE
+SD_INVCS	.EQU	TRUE		; INVERT CS
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_UART)
@@ -187,6 +191,7 @@ SD_CLK		.EQU	%00000100	; UART MCR:2 IS CLOCK
 SD_DI		.EQU	%00000001	; UART MCR:0 IS DATA IN (CARD <- CPU)
 SD_DO		.EQU	%00100000	; UART MSR:5 IS DATA OUT (CARD -> CPU)
 SD_IOBASE	.EQU	UARTIOB		; IOBASE
+SD_INVCS	.EQU	TRUE		; INVERT CS
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_DSD)		; DUAL SD
@@ -201,6 +206,7 @@ SD_CLK		.EQU	%00000010	; RTC:1 IS CLOCK
 SD_DI		.EQU	%00000001	; RTC:6 IS DATA IN (CARD <- CPU)
 SD_DO		.EQU	%00000001	; RTC:0 IS DATA OUT (CARD -> CPU)
 SD_IOBASE	.EQU	SD_OPRREG	; IOBASE
+SD_INVCS	.EQU	FALSE		; INVERT CS
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_MK4)		; MARK IV (CSIO STYLE INTERFACE)
@@ -211,6 +217,7 @@ SD_CS0		.EQU	%00000100	; SELECT ACTIVE
 SD_CNTR		.EQU	Z180_CNTR
 SD_TRDR		.EQU	Z180_TRDR
 SD_IOBASE	.EQU	SD_OPRREG	; IOBASE
+SD_INVCS	.EQU	FALSE		; INVERT CS
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_SC)		; SC
@@ -223,6 +230,7 @@ SD_CS1		.EQU	%00001000	; RTC:3 IS SELECT FOR SECONDARY SPI CARD
 SD_CNTR		.EQU	Z180_CNTR
 SD_TRDR		.EQU	Z180_TRDR
 SD_IOBASE	.EQU	SD_OPRREG	; IOBASE
+SD_INVCS	.EQU	TRUE		; INVERT CS
 ;
 RTCDEF		.SET	RTCDEF | SD_OPRDEF	; SET DEFAULT IN HBIOS MAINLINE
 #ENDIF
@@ -270,6 +278,30 @@ SD_CS0		.EQU	%00100000	; IN/OUT:SD_OPREG:5 = CS2, SDCARD2 CS, IN=1 Card present
 SD_CS1		.EQU	%00010000	; IN/OUT:SD_OPREG:4 = CS1, SDCARD1 CS, IN=1 Card present
   #ENDIF
 SD_IOBASE	.EQU	SD_BASE		; IOBASE
+SD_INVCS	.EQU	FALSE		; INVERT CS
+#ENDIF
+;
+;
+#IF (SDMODE == SDMODE_USR)		; USER DEFINED HARDWARE CONFIGURATION
+;
+; THIS MODE IS INTENDED TO ALLOW A USER TO EASILY CONFIGURE A CUSTOM
+; SD CARD INTERFACE.  IT IS NOT YET COMPLETE OR TESTED AND PROBABLY DOES
+; NOT YET WORK.
+;
+SD_DEVMAX	.EQU	2		; NUMBER OF PHYSICAL UNITS (SOCKETS)
+SD_IOBASE	.EQU	$01		; IO BASE ADDRESS FOR SD INTERFACE
+SD_OPRREG	.EQU	SD_IOBASE	; OUTPUT PORT (OUTPUT: CS, CLK, DIN)
+SD_OPRDEF	.EQU	%00000101	; OUTPUT PORT DEFAULT STATE
+SD_OPRMSK	.EQU	%00001111	; OUTPUT PORT MASK
+SD_INPREG	.EQU	SD_IOBASE	; INPUT REGISTER
+SD_CS0		.EQU	%00001000	; SELECT
+SD_CLK		.EQU	%00000100	; CLOCK
+SD_DI		.EQU	%00000010	; DATA IN (CARD <- CPU) MOSI
+SD_DO		.EQU	%00000001	; DATA OUT (CARD -> CPU) MISO
+SD_CINIT	.EQU	TRUE		; INITIALIZE OUTPUT PORT
+SD_DDR		.EQU	$03		; DATA DIRECTION REGISTER
+SD_DDRVAL	.EQU	%00001101	; DATA DIRECTION REGISTER VALUE
+SD_INVCS	.EQU	FALSE		; INVERT CS
 #ENDIF
 ;
 #IF (SD_DEVCNT > SD_DEVMAX)
@@ -477,6 +509,13 @@ SD_INIT:
 	LD	A,SD_BASE
 	CALL	PRTHEXBYTE
 #ENDIF
+;
+#IF (SDMODE == SDMODE_USR)
+	PRTS(" MODE=USER$")
+	PRTS(" IO=0x$")
+	LD	A,SD_IOBASE
+	CALL	PRTHEXBYTE
+#ENDIF
 ;
 	CALL	SD_PROBE		; CHECK FOR HARDWARE
 	JR	Z,SD_INIT00		; CONTINUE IF PRESENT
@@ -1695,6 +1734,22 @@ SD_SETUP:
 	LD	(SD_OPRVAL),A		; RECORD THE WORKING VALLUE
 	OUT	(SD_OPRREG),A		; OPRREG == SIO_MCR
 #ENDIF
+;
+#IF (SDMODE == SDMODE_USR)
+  #IF (SD_CINIT == TRUE)
+	LD	A,(SD_OPRMSK)		; GET OUTPUT PORT MASK
+	CPL				; INVERT ACCUMULATOR
+	LD	C,A			; SAVE IT FOR LATER
+	LD	A,(SD_DDR)		; GET DATA DIRECTION REGISTER VALUE
+	AND	C			; ZERO ALL INTERESTING BITS
+	OR	(SD_DDRVAL)		; ADD OUR VALUE
+	LD	(SD_DDR),A		; WRITE IT
+  #ENDIF
+;
+	LD	A,SD_OPRDEF
+	LD	(SD_OPRVAL),A
+	OUT	(SD_OPRREG),A
+#ENDIF
 ;
 	XOR	A
 	RET
@@ -1766,7 +1821,8 @@ SD_SELECT1:
 ;
 SD_SELECT2:
 ; ADJUST BIT(S) FOR INTERFACES USING INVERTED CS BITS
-#IF ((SDMODE == SDMODE_PPI) | (SDMODE == SDMODE_UART) | (SDMODE == SDMODE_SC))
+;#IF ((SDMODE == SDMODE_PPI) | (SDMODE == SDMODE_UART) | (SDMODE == SDMODE_SC))
+#IF (SD_INVCS)
   #IF ((SDMODE == SDMODE_SC) & (SD_DEVCNT > 1))
 	XOR	SD_CS0 | SD_CS1
   #ELSE
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index 5bcb465f..27edfd39 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -181,6 +181,7 @@ SDMODE_DSD	.EQU	6		; DUAL SD
 SDMODE_MK4	.EQU	7		; MARK IV
 SDMODE_SC	.EQU	8		; SC (Steve Cousins)
 SDMODE_MT	.EQU	9		; MT (Shift register SPI WIZNET for RC2014)
+SDMODE_USR	.EQU	10		; USER DEFINED (in sd.asm) (NOT COMPLETE)
 ;
 ; AY SOUND CHIP MODE SELECTIONS
 ;
diff --git a/Source/ver.inc b/Source/ver.inc
index b66c684d..b998e315 100644
--- a/Source/ver.inc
+++ b/Source/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	1
 #DEFINE	RUP	1
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.1.1-pre.183"
+#DEFINE BIOSVER	"3.1.1-pre.184"
diff --git a/Source/ver.lib b/Source/ver.lib
index 291b4eda..70f898fa 100644
--- a/Source/ver.lib
+++ b/Source/ver.lib
@@ -3,5 +3,5 @@ rmn	equ	1
 rup	equ	1
 rtp	equ	0
 biosver	macro
-	db	"3.1.1-pre.183"
+	db	"3.1.1-pre.184"
 	endm