diff --git a/Doc/RomWBW Applications.pdf b/Doc/RomWBW Applications.pdf
index 1c202ecc..8a706242 100644
Binary files a/Doc/RomWBW Applications.pdf and b/Doc/RomWBW Applications.pdf differ
diff --git a/Doc/RomWBW Disk Catalog.pdf b/Doc/RomWBW Disk Catalog.pdf
index 79200ea1..ab89e742 100644
Binary files a/Doc/RomWBW Disk Catalog.pdf and b/Doc/RomWBW Disk Catalog.pdf differ
diff --git a/Doc/RomWBW Hardware.pdf b/Doc/RomWBW Hardware.pdf
index 439a6da1..21922320 100644
Binary files a/Doc/RomWBW Hardware.pdf and b/Doc/RomWBW Hardware.pdf differ
diff --git a/Doc/RomWBW Introduction.pdf b/Doc/RomWBW Introduction.pdf
index 3224d468..7e99da42 100644
Binary files a/Doc/RomWBW Introduction.pdf and b/Doc/RomWBW Introduction.pdf differ
diff --git a/Doc/RomWBW System Guide.pdf b/Doc/RomWBW System Guide.pdf
index 9c2223f1..f2de2898 100644
Binary files a/Doc/RomWBW System Guide.pdf and b/Doc/RomWBW System Guide.pdf differ
diff --git a/Doc/RomWBW User Guide.pdf b/Doc/RomWBW User Guide.pdf
index f2df9521..0a6cc70a 100644
Binary files a/Doc/RomWBW User Guide.pdf and b/Doc/RomWBW User Guide.pdf differ
diff --git a/ReadMe.md b/ReadMe.md
index 36fc7cdb..c315b98c 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -7,7 +7,7 @@
 **RomWBW Introduction** \
 Version 3.5 \
 Wayne Warthen  ([wwarthen@gmail.com](mailto:wwarthen@gmail.com)) \
-24 Jan 2025
+25 Jan 2025
 
 # Overview
 
diff --git a/ReadMe.txt b/ReadMe.txt
index d15fe923..cf98e836 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -1,6 +1,6 @@
 RomWBW Introduction
 Wayne Warthen (wwarthen@gmail.com)
-24 Jan 2025
+25 Jan 2025
 
 
 
diff --git a/Source/Doc/Hardware.md b/Source/Doc/Hardware.md
index 2f7cbbe8..a2262517 100644
--- a/Source/Doc/Hardware.md
+++ b/Source/Doc/Hardware.md
@@ -1352,6 +1352,8 @@ program the image into the first 512KB of the ROM for now.
 
 `\clearpage`{=latex}
 
+## Z80 K80W CPU Module
+
 #### ROM Image File:  RCZ80_k8w_std.rom
 
 |                   |               |
@@ -1876,113 +1878,126 @@ program the image into the first 512KB of the ROM for now.
 This section briefly describes each of the possible devices that
 may be discovered by RomWBW in your system.
 
-## Serial
-
-| **ID**    | **Type** | **Description**                                        |
-|-----------|----------|--------------------------------------------------------|
-| ACIA      | Char     | MC68B50 Asynchronous Communications Interface Adapter  |
-| ASCI      | Char     | Zilog Z180 CPU Built-in Serial Ports                   |
-| DUART     | Char     | SCC2681 or compatible Dual UART                        |
-| EF        | Char     | EF9345 Video Display Controller                        |
-| KBD       | Keyboard | 8242 PS/2 Keyboard Controller                          |
-| LPT       | Char     | Parallel I/O Controller                                |
-| MSXKYB    | Keyboard | MSX Compliant Matrix Keyboard                          |
-| PIO       | Char     | Zilog Parallel Interface Controller                    |
-| PPK       | Keyboard | Matrix Keyboard                                        |
-| PPPCON    | Serial   | ParPortProp Serial Console Interface                   |
-| PRPCON    | Serial   | PropIO Serial Console Interface                        |
-| SCON      | Char     | S100 Console                                           |
-| SIO       | Char     | Zilog Serial Port Interface                            |
-| SSER      | Char     | Simple Serial Interface                                |
-| UART      | Char     | 16C550 Family Serial Interface                         |
-| USB-FIFO  | Char     | FT232H-based ECB USB FIFO                              |
-| Z2U       | Char     | Zilog Z280 CPU Built-in Serial Ports                   |
+## Character
+
+| **ID**    | **Description**                                        |
+|-----------|--------------------------------------------------------|
+| ACIA      | MC68B50 Asynchronous Communications Interface Adapter  |
+| ASCI      | Zilog Z180 CPU Built-in Serial Ports                   |
+| DUART     | SCC2681 or compatible Dual UART                        |
+| EF        | EF9345 Video Display Controller                        |
+| ESPCON    | ESP32 Firmware-based Video Console                     |
+| ESPSER    | ESP32 Firmware-based Serial Interface                  |
+| LPT       | Parallel I/O Controller                                |
+| PIO       | Zilog Parallel Interface Controller                    |
+| PPPCON    | ParPortProp Serial Console Interface                   |
+| PRPCON    | PropIO Serial Console Interface                        |
+| SCON      | S100 Console                                           |
+| SIO       | Zilog Serial Port Interface                            |
+| SSER      | Simple Serial Interface                                |
+| UART      | 16C550 Family Serial Interface                         |
+| USB-FIFO  | FT232H-based ECB USB FIFO                              |
+| Z2U       | Zilog Z280 CPU Built-in Serial Ports                   |
 
 By default, RomWBW will use the first available character device it
-discovers for the initial console.  Serial devices are scanned in
-the following order:
+discovers for the initial console.  The following character devices are
+scanned in the order shown.  The available character devices depend on
+the active platform and configuration.
 
+#. SSET: Simple Serial Interface
 #. ASCI: Zilog Z180 CPU Built-in Serial Ports
 #. Z2U: Zilog Z280 CPU Built-in Serial Ports
 #. UART: 16C550 Family Serial Interface
 #. DUART: SCC2681 or compatible Dual UART
 #. SIO: Zilog Serial Port Interface
 #. ACIA: MC68B50 Asynchronous Communications Interface Adapter
+#. USB-FIFO: FT232H-based ECB USB FIFO
 
 ## Disk
 
-| **ID**    | **Type** | **Description**                                        |
-|-----------|----------|--------------------------------------------------------|
-| CHSD      | Disk     | CH37x SD Card Interface                                |
-| CHUSB     | Disk     | CH37x USB Drive Interface                              |
-| EMM       | Disk     | Disk drive on Parallel Port emm interface (Zip Drive)  |
-| FD        | Disk     | 8272 or compatible Floppy Disk Controller              |
-| HDSK      | Disk     | SIMH Simulator Hard Disk                               |
-| IDE       | Disk     | IDE/ATA/ATAPI Hard Disk Interface                      |
-| IMM       | Disk     | IMM Zip Drive on PPI                                   |
-| MD        | Disk     | ROM/RAM Disk                                           |
-| PPA       | Disk     | PPA Zip Drive on PPI                                   |
-| PPIDE     | Disk     | 8255 IDE/ATA/ATAPI Hard Disk Interface                 |
-| PPPSD     | Disk     | ParPortProp SD Card Interface                          |
-| PRPSD     | Disk     | PropIO SD Card Interface                               |
-| RF        | Disk     | RAM Floppy Disk Interface                              |
-| SD        | Disk     | SD Card Interface                                      |
-| SYQ       | Disk     | Iomega SparQ Drive on PPI                              |
+| **ID**    | **Description**                                        |
+|-----------|--------------------------------------------------------|
+| CHSD      | CH37x SD Card Interface                                |
+| CHUSB     | CH37x USB Drive Interface                              |
+| FD        | 8272 or compatible Floppy Disk Controller              |
+| HDSK      | SIMH Simulator Hard Disk                               |
+| IDE       | IDE/ATA/ATAPI Hard Disk Interface                      |
+| IMM       | Zip Drive on PPI (IMM variant)                         |
+| MD        | ROM/RAM Disk                                           |
+| PPA       | Zip Drive on PPI (PPA variant)                         |
+| PPIDE     | 8255 IDE/ATA/ATAPI Hard Disk Interface                 |
+| PPPSD     | ParPortProp SD Card Interface                          |
+| PRPSD     | PropIO SD Card Interface                               |
+| RF        | RAM Floppy Disk Interface                              |
+| SD        | SD Card Interface                                      |
+| SYQ       | Iomega SparQ Drive on PPI                              |
 
 ## Video
 
-| **ID**    | **Type** | **Description**                                        |
-|-----------|----------|--------------------------------------------------------|
-| CVDU      | Video    | MC8563-based Video Display Controller                  |
-| FV        | Video    | S100 FPGA Z80 Onboard VGA/Keyboard                     |
-| GDC       | Video    | uPD7220 Video Display Controller                       |
-| TMS       | Video    | TMS9918/38/58 Video Display Controller                 |
-| VDU       | Video    | MC6845 Family Video Display Controller                 |
-| VGA       | Video    | HD6445CP4-based Video Display Controller               |
-| VRC       | Video    | VGARC Video Display Controller                         |
+| **ID**    | **Description**                                        |
+|-----------|--------------------------------------------------------|
+| CVDU      | MC8563-based Video Display Controller                  |
+| FV        | S100 FPGA Z80 Onboard VGA/Keyboard                     |
+| GDC       | uPD7220 Video Display Controller                       |
+| TMS       | TMS9918/38/58 Video Display Controller                 |
+| VDU       | MC6845 Family Video Display Controller                 |
+| VGA       | HD6445CP4-based Video Display Controller               |
+| VRC       | VGARC Video Display Controller                         |
+
+## Keyboard
+
+| **ID**    | **Description**                                        |
+|-----------|--------------------------------------------------------|
+| KBD       | 8242 PS/2 Keyboard Controller                          |
+| MSXKYB    | MSX Compliant Matrix Keyboard                          |
+| NABUKB    | NABU Keyboard                                          |
+| PPK       | Matrix Keyboard                                        |
 
 ## Audio
 
-| **ID**    | **Type** | **Description**                                        |
-|-----------|----------|--------------------------------------------------------|
-| AY        | Audio    | AY-3-8910/YM2149 Programmable Sound Generator          |
-| SN76489   | Sound    | SN76489 Programmable Sound Generator                   |
-| SPK       | Sound    | Bit-bang Speaker                                       |
-| YM        | Audio    | YM2612 Programmable Sound Generator                    |
+| **ID**    | **Description**                                        |
+|-----------|--------------------------------------------------------|
+| AY        | AY-3-8910/YM2149 Programmable Sound Generator          |
+| SN76489   | SN76489 Programmable Sound Generator                   |
+| SPK       | Bit-bang Speaker                                       |
+| YM        | YM2612 Programmable Sound Generator                    |
 
 ## RTC (RealTime Clock)
 
-| **ID**    | **Type** | **Description**                                        |
-|-----------|----------|--------------------------------------------------------|
-| BQRTC     | RTC      | BQ4845P Real Time Clock                                |
-| DS5RTC    | RTC      | Maxim DS1305 SPI Real-Time Clock w/ NVRAM              |
-| DS7RTC    | RTC      | Maxim DS1307 PCF I2C Real-Time Clock w/ NVRAM          |
-| DS1501RTC | RTC      | Maxim DS1501/DS1511 Watchdog Real-Time Clock           |
-| DSRTC     | RTC      | Maxim DS1302 Real-Time Clock w/ NVRAM                  |
-| INTRTC    | RTC      | Interrupt-based Real Time Clock                        |
-| PCF       | RTC      | PCF8584-based I2C Real-Time Clock                      |
-| RP5C01    | RTC      | Ricoh RPC01A Real-Time Clock w/ NVRAM                  |
-| SIMRTC    | RTC      | SIMH Simulator Real-Time Clock                         |
-
-## DSKY (DiSplay KeYboard)
-
-| **ID**    | **Type** | **Description**                                        |
-|-----------|----------|--------------------------------------------------------|
-| ICM       | DsKy     | ICM7218-based Display/Keypad on PPI                    |
-| PKD       | DsKy     | P8279-based Display/Keypad on PPI                      |
+| **ID**    | **Description**                                        |
+|-----------|--------------------------------------------------------|
+| BQRTC     | BQ4845P Real Time Clock                                |
+| DS5RTC    | Maxim DS1305 SPI Real-Time Clock w/ NVRAM              |
+| DS7RTC    | Maxim DS1307 PCF I2C Real-Time Clock w/ NVRAM          |
+| DS1501RTC | Maxim DS1501/DS1511 Watchdog Real-Time Clock           |
+| DSRTC     | Maxim DS1302 Real-Time Clock w/ NVRAM                  |
+| INTRTC    | Interrupt-based Real Time Clock                        |
+| PCF       | PCF8584-based I2C Real-Time Clock                      |
+| RP5C01    | Ricoh RPC01A Real-Time Clock w/ NVRAM                  |
+| SIMRTC    | SIMH Simulator Real-Time Clock                         |
+
+## DsKy (DiSplay KeYpad)
+
+| **ID**    | **Description**                                        |
+|-----------|--------------------------------------------------------|
+| FP        | Simple LED & Switch Front Panel                        |
+| GM7303    | Prolog 7303 derived Display/Keypad                     |
+| H8P       | Heath H8 Display/Keypad                                |
+| ICM       | ICM7218-based Display/Keypad on PPI                    |
+| LCD       | Hitachi HD44780-based LCD Display                      |
+| PKD       | P8279-based Display/Keypad on PPI                      |
 
 ## System
 
-| **ID**    | **Type** | **Description**                                        |
-|-----------|----------|--------------------------------------------------------|
-| CH        | System   | CH375/376 USB Controller                               |
-| CTC       | System   | Zilog Clock/Timer                                      |
-| DMA       | System   | Zilog DMA Controller                                   |
-| FP        | System   | Simple LED & Switch Front Panel                        |
-| KIO       | System   | Zilog Serial/ Parallel Counter/Timer                   |
-| LCD       | System   | Hitachi HD44780-based LCD Display                      |
-| PPP       | System   | ParPortProp Host Interface Controller                  |
-| PRP       | System   | PropIO Host Interface Controller                       |
+| **ID**    | **Description**                                        |
+|-----------|--------------------------------------------------------|
+| CH        | CH375/376 USB Interface Controller                     |
+| CTC       | Zilog Clock/Timer                                      |
+| DMA       | Zilog DMA Controller                                   |
+| ESP       | ESP32 Firmware-based interface                         |
+| KIO       | Zilog Serial/ Parallel Counter/Timer                   |
+| PPP       | ParPortProp Host Interface Controller                  |
+| PRP       | PropIO Host Interface Controller                       |
 
 # UNA Hardware BIOS
 
diff --git a/Source/HBIOS/Config/GMZ180_std.asm b/Source/HBIOS/Config/GMZ180_std.asm
index fd1954be..e6d90f77 100644
--- a/Source/HBIOS/Config/GMZ180_std.asm
+++ b/Source/HBIOS/Config/GMZ180_std.asm
@@ -60,7 +60,7 @@ FPLED_IO	.SET	$00		; FP: PORT ADDRESS FOR FP LEDS
 LEDENABLE	.SET	FALSE		; ENABLES STATUS LED (SINGLE LED)
 LEDMODE		.SET	LEDMODE_STD	; LEDMODE_[STD|SC|RTC|NABU]
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
diff --git a/Source/HBIOS/Config/MK4_std.asm b/Source/HBIOS/Config/MK4_std.asm
index 42c0d707..d668de6f 100644
--- a/Source/HBIOS/Config/MK4_std.asm
+++ b/Source/HBIOS/Config/MK4_std.asm
@@ -54,7 +54,7 @@ Z180_CLKDIV	.SET	1		; Z180: CHK DIV: 0=OSC/2, 1=OSC, 2=OSC*2
 Z180_MEMWAIT	.SET	0		; Z180: MEMORY WAIT STATES (0-3)
 Z180_IOWAIT	.SET	1		; Z180: I/O WAIT STATES TO ADD ABOVE 1 W/S BUILT-IN (0-3)
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 UARTENABLE	.SET	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 SIOENABLE	.SET	FALSE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
diff --git a/Source/HBIOS/Config/RCEZ80_std.asm b/Source/HBIOS/Config/RCEZ80_std.asm
index fc14ade3..8f70db24 100644
--- a/Source/HBIOS/Config/RCEZ80_std.asm
+++ b/Source/HBIOS/Config/RCEZ80_std.asm
@@ -52,7 +52,7 @@ CPUOSC		.SET	20000000	; CPU OSC FREQ IN MHZ
 FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;;
 TMSENABLE	.SET	FALSE		; TMS: ENABLE TMS9918 VIDEO/KBD DRIVER (TMS.ASM)
 TMSMODE		.SET	TMSMODE_MSX	; TMS: DRIVER MODE: TMSMODE_[SCG|N8|MSX|MSXKBD|MSXMKY|MBC|COLECO|DUO|NABU]
diff --git a/Source/HBIOS/Config/RCZ180_ext_std.asm b/Source/HBIOS/Config/RCZ180_ext_std.asm
index e42b56c4..eb760f9c 100644
--- a/Source/HBIOS/Config/RCZ180_ext_std.asm
+++ b/Source/HBIOS/Config/RCZ180_ext_std.asm
@@ -57,7 +57,7 @@ Z180_IOWAIT	.SET	1		; Z180: I/O WAIT STATES TO ADD ABOVE 1 W/S BUILT-IN (0-3)
 FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
diff --git a/Source/HBIOS/Config/RCZ180_nat_std.asm b/Source/HBIOS/Config/RCZ180_nat_std.asm
index fd34de40..e0b42775 100644
--- a/Source/HBIOS/Config/RCZ180_nat_std.asm
+++ b/Source/HBIOS/Config/RCZ180_nat_std.asm
@@ -57,7 +57,7 @@ Z180_IOWAIT	.SET	1		; Z180: I/O WAIT STATES TO ADD ABOVE 1 W/S BUILT-IN (0-3)
 FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
diff --git a/Source/HBIOS/Config/RCZ180_z1rcc_std.asm b/Source/HBIOS/Config/RCZ180_z1rcc_std.asm
index 30a3b858..217b25d2 100644
--- a/Source/HBIOS/Config/RCZ180_z1rcc_std.asm
+++ b/Source/HBIOS/Config/RCZ180_z1rcc_std.asm
@@ -62,7 +62,7 @@ Z180_IOWAIT	.SET	1		; Z180: I/O WAIT STATES TO ADD ABOVE 1 W/S BUILT-IN (0-3)
 FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
diff --git a/Source/HBIOS/Config/RCZ280_ext_std.asm b/Source/HBIOS/Config/RCZ280_ext_std.asm
index b97e6d0a..d6187a90 100644
--- a/Source/HBIOS/Config/RCZ280_ext_std.asm
+++ b/Source/HBIOS/Config/RCZ280_ext_std.asm
@@ -59,7 +59,7 @@ Z280_INTWAIT	.SET	0		; Z280: INT ACK WAIT STATUS (0-3)
 FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 UARTENABLE	.SET	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 Z2UENABLE	.SET	TRUE		; Z2U: ENABLE Z280 UART SERIAL DRIVER (Z2U.ASM)
diff --git a/Source/HBIOS/Config/RCZ280_nat_std.asm b/Source/HBIOS/Config/RCZ280_nat_std.asm
index 765435b1..c7afd3d9 100644
--- a/Source/HBIOS/Config/RCZ280_nat_std.asm
+++ b/Source/HBIOS/Config/RCZ280_nat_std.asm
@@ -59,7 +59,7 @@ Z280_INTWAIT	.SET	0		; Z280: INT ACK WAIT STATUS (0-3)
 FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 UARTENABLE	.SET	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 Z2UENABLE	.SET	TRUE		; Z2U: ENABLE Z280 UART SERIAL DRIVER (Z2U.ASM)
diff --git a/Source/HBIOS/Config/RCZ80_easy_std.asm b/Source/HBIOS/Config/RCZ80_easy_std.asm
index 93d13f02..a84e7e4f 100644
--- a/Source/HBIOS/Config/RCZ80_easy_std.asm
+++ b/Source/HBIOS/Config/RCZ80_easy_std.asm
@@ -63,7 +63,7 @@ WDOGIO		.SET	$6F		; WATCHDOG REGISTER ADR
 FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
diff --git a/Source/HBIOS/Config/RCZ80_jbl_std.asm b/Source/HBIOS/Config/RCZ80_jbl_std.asm
index 03d49620..44834b7c 100644
--- a/Source/HBIOS/Config/RCZ80_jbl_std.asm
+++ b/Source/HBIOS/Config/RCZ80_jbl_std.asm
@@ -70,7 +70,7 @@
 ;
 CPUOSC		.SET	3686400		; CPU OSC FREQ IN MHZ
 ;
-VDAEMU_SERKBD	.SET	1		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DUARTENABLE	.SET	FALSE		; DUART: ENABLE 2681/2692 SERIAL DRIVER (DUART.ASM)
 ;
diff --git a/Source/HBIOS/Config/RCZ80_kio_std.asm b/Source/HBIOS/Config/RCZ80_kio_std.asm
index 27feefe3..65be82dc 100644
--- a/Source/HBIOS/Config/RCZ80_kio_std.asm
+++ b/Source/HBIOS/Config/RCZ80_kio_std.asm
@@ -55,6 +55,8 @@ CTCENABLE	.SET	TRUE		; ENABLE ZILOG CTC SUPPORT
 CTCBASE		.SET	KIOBASE+$04	; CTC BASE I/O ADDRESS
 CTCTIMER	.SET	TRUE		; ENABLE CTC PERIODIC TIMER
 ;
+INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
 ACIAENABLE	.SET	FALSE		; ACIA: ENABLE MOTOROLA 6850 ACIA DRIVER (ACIA.ASM)
 ;
 SIOCNT		.SET	1		; SIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
@@ -64,3 +66,9 @@ SIO0ACLK	.SET	1843200		; SIO 0A: OSC FREQ IN HZ, ZP=2457600/4915200, RC/SMB=7372
 SIO0ACTCC	.SET	0		; SIO 0A: CTC CHANNEL 0=A, 1=B, 2=C, 3=D, -1 FOR NONE
 SIO0BCLK	.SET	1843200		; SIO 0B: OSC FREQ IN HZ, ZP=2457600/4915200, RC/SMB=7372800
 SIO0BCTCC	.SET	1		; SIO 0B: CTC CHANNEL 0=A, 1=B, 2=C, 3=D, -1 FOR NONE
+
+
+LPTENABLE	.SET	TRUE
+PPAENABLE	.SET	TRUE
+IMMENABLE	.SET	TRUE
+SYQENABLE	.SET	TRUE
diff --git a/Source/HBIOS/Config/RCZ80_skz_std.asm b/Source/HBIOS/Config/RCZ80_skz_std.asm
index 55c94c1e..a723d195 100644
--- a/Source/HBIOS/Config/RCZ80_skz_std.asm
+++ b/Source/HBIOS/Config/RCZ80_skz_std.asm
@@ -57,7 +57,7 @@ FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 LEDENABLE	.SET	TRUE		; ENABLES STATUS LED (SINGLE LED)
 LEDPORT		.SET	$6E		; STATUS LED PORT ADDRESS
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 RP5RTCENABLE	.SET	FALSE		; RP5C01 RTC BASED CLOCK (RP5RTC.ASM)
diff --git a/Source/HBIOS/Config/RCZ80_std.asm b/Source/HBIOS/Config/RCZ80_std.asm
index 2df45d5d..f4951628 100644
--- a/Source/HBIOS/Config/RCZ80_std.asm
+++ b/Source/HBIOS/Config/RCZ80_std.asm
@@ -52,7 +52,7 @@ CPUOSC		.SET	7372800		; CPU OSC FREQ IN MHZ
 FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 RP5RTCENABLE	.SET	FALSE		; RP5C01 RTC BASED CLOCK (RP5RTC.ASM)
diff --git a/Source/HBIOS/Config/RCZ80_tiny_std.asm b/Source/HBIOS/Config/RCZ80_tiny_std.asm
index 563d64ad..02463225 100644
--- a/Source/HBIOS/Config/RCZ80_tiny_std.asm
+++ b/Source/HBIOS/Config/RCZ80_tiny_std.asm
@@ -67,7 +67,7 @@ FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 LEDENABLE	.SET	TRUE		; ENABLES STATUS LED (SINGLE LED)
 LEDPORT		.SET	$6E		; STATUS LED PORT ADDRESS
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 RP5RTCENABLE	.SET	FALSE		; RP5C01 RTC BASED CLOCK (RP5RTC.ASM)
diff --git a/Source/HBIOS/Config/SCZ180_sc126_std.asm b/Source/HBIOS/Config/SCZ180_sc126_std.asm
index c7b1c494..c924d7fe 100644
--- a/Source/HBIOS/Config/SCZ180_sc126_std.asm
+++ b/Source/HBIOS/Config/SCZ180_sc126_std.asm
@@ -59,7 +59,7 @@ FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPLED_IO	.SET	$0D		; FP: PORT ADDRESS FOR FP LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
diff --git a/Source/HBIOS/Config/SCZ180_sc130_std.asm b/Source/HBIOS/Config/SCZ180_sc130_std.asm
index a71904a2..a226768c 100644
--- a/Source/HBIOS/Config/SCZ180_sc130_std.asm
+++ b/Source/HBIOS/Config/SCZ180_sc130_std.asm
@@ -60,7 +60,7 @@ FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
 ;
 LEDENABLE	.SET	TRUE		; ENABLE STATUS LED (SINGLE LED)
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
diff --git a/Source/HBIOS/Config/SCZ180_sc700_std.asm b/Source/HBIOS/Config/SCZ180_sc700_std.asm
index eaecddb0..5062399c 100644
--- a/Source/HBIOS/Config/SCZ180_sc700_std.asm
+++ b/Source/HBIOS/Config/SCZ180_sc700_std.asm
@@ -59,7 +59,7 @@ FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPLED_IO	.SET	$00		; FP: PORT ADDRESS FOR FP LEDS
 LEDENABLE	.SET	TRUE		; ENABLES STATUS LED (SINGLE LED)
 LEDMODE		.SET	LEDMODE_STD	; LEDMODE_[STD|SC|RTC|NABU]
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 ;
 DSRTCENABLE	.SET	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
diff --git a/Source/HBIOS/cfg_HEATH.asm b/Source/HBIOS/cfg_HEATH.asm
index 5e02cd3e..91ad4035 100644
--- a/Source/HBIOS/cfg_HEATH.asm
+++ b/Source/HBIOS/cfg_HEATH.asm
@@ -132,7 +132,7 @@ BOOTCON		.SET	0		; BOOT CONSOLE DEVICE
 SECCON		.SET	$FF		; SECONDARY CONSOLE DEVICE
 CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 VDAEMU		.SET	EMUTYP_ANSI	; VDA EMULATION: EMUTYP_[TTY|ANSI]
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ANSITRACE	.SET	1		; ANSI DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 PPKTRACE	.SET	1		; PPK DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 KBDTRACE	.SET	1		; KBD DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index a829e7b4..d3602906 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -283,6 +283,16 @@ SUPCTS	.EQU	FALSE		; SUPPRESS CTS DURING HBIOS BOOT
   #ENDIF
 #ENDIF
 ;
+; IF VDAEMU_SEKBD AND AUTOCON ARE BOTH ACTIVE, THEN THE BOOT LOADER
+; PROMPT WILL BE CONFUSED BECAUSE IT WILL POLL THE SHARED SERIAL PORT
+; FOR BOTH DEVICES.
+;
+#IF ((VDAEMU_SERKBD != $FF) & (AUTOCON == TRUE))
+	.ECHO	"*** ERROR: VDAEMU_SERKBD CANNOT BE COMBINED WITH AUTOCON!!! ***\n"
+	.ECHO	"SET VDAEMU_SERKBD = $FF OR SET AUTOCON = FALSE\n"
+	!!!	; FORCE AN ASSEMBLY ERROR
+#ENDIF
+;
 ; CONVERT ROMWBW LOGICAL BANK ID TO PHYSICAL 32K BANK OFFSET
 ;
 #DEFINE PBANK(X) (((X >> 7) * (RAMBIAS / 32)) + (X & $7F))
diff --git a/Source/HBIOS/tms.asm b/Source/HBIOS/tms.asm
index 6633f696..f2c3bbc7 100644
--- a/Source/HBIOS/tms.asm
+++ b/Source/HBIOS/tms.asm
@@ -74,6 +74,7 @@ TMSKBD		.SET	TMSKBD_PPK	; PPK KEYBOARD
 #IF (TMSMODE == TMSMODE_MSX)
 TMS_DATREG	.EQU	$98		; READ/WRITE DATA
 TMS_CMDREG	.EQU	$99		; READ STATUS / WRITE REG SEL
+		DEVECHO	"MSX"
 #ENDIF
 ;
 #IF (TMSMODE == TMSMODE_MSXKBD)
@@ -122,6 +123,7 @@ TMSKBD		.SET	TMSKBD_KBD	; PS2 KEYBOARD
 TMS_DATREG	.EQU	$A0		; READ/WRITE DATA
 TMS_CMDREG	.EQU	$A1		; READ STATUS / WRITE REG SEL
 TMSKBD		.SET	TMSKBD_NABU	; NABU KEYBOARD
+		DEVECHO	"NABU"
 #ENDIF
 ;
 		DEVECHO	", IO="