diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index 5a485c7b..3247befe 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -23,6 +23,7 @@ Version 2.9.2
 - WBW: DSRTC now detects DS-1302 presence dynamically
 - WBW: SC126 platform renamed to SCZ180 w/ configs for SC126, SC130
 - WBW: Add status LED support
+- WBW: Add support for secondry SPI (SD Card) on SC126
 
 Version 2.9.1
 -------------
diff --git a/ReadMe.txt b/ReadMe.txt
index 23a2c9b8..cbd34453 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -7,7 +7,7 @@
 ***********************************************************************
 
 Wayne Warthen (wwarthen@gmail.com)
-Version 2.9.2-pre.15, 2019-10-08
+Version 2.9.2-pre.16, 2019-10-09
 https://www.retrobrewcomputers.org/
 
 RomWBW is a ROM-based implementation of CP/M-80 2.2 and Z-System for 
diff --git a/Source/CBIOS/ver.inc b/Source/CBIOS/ver.inc
index b98760fe..fd9cafab 100644
--- a/Source/CBIOS/ver.inc
+++ b/Source/CBIOS/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	9
 #DEFINE	RUP	2
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"2.9.2-pre.15	"
+#DEFINE BIOSVER	"2.9.2-pre.16"
diff --git a/Source/HBIOS/Config/SCZ180_126.asm b/Source/HBIOS/Config/SCZ180_126.asm
index f59898a0..4b6e44e8 100644
--- a/Source/HBIOS/Config/SCZ180_126.asm
+++ b/Source/HBIOS/Config/SCZ180_126.asm
@@ -48,3 +48,5 @@ IDEMODE		.SET	IDEMODE_RC	; IDE: DRIVER MODE: IDEMODE_[DIO|DIDE]
 PPIDEENABLE	.SET	FALSE		; PPIDE: ENABLE PARALLEL PORT IDE DISK DRIVER (PPIDE.ASM)
 ;
 SDENABLE	.SET	TRUE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
+SDCNT		.SET	2		; SD: NUMBER OF SD CARD DEVICES (1-2), FOR DSD & SC ONLY
+
diff --git a/Source/HBIOS/cfg_ezz80.asm b/Source/HBIOS/cfg_ezz80.asm
index 7642b05a..121f3aaf 100644
--- a/Source/HBIOS/cfg_ezz80.asm
+++ b/Source/HBIOS/cfg_ezz80.asm
@@ -125,6 +125,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 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]
+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)
 SDCSIOFAST	.EQU	FALSE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/cfg_master.asm b/Source/HBIOS/cfg_master.asm
index 68902486..947bd5e0 100644
--- a/Source/HBIOS/cfg_master.asm
+++ b/Source/HBIOS/cfg_master.asm
@@ -167,6 +167,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 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]
+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)
 SDCSIOFAST	.EQU	FALSE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/cfg_mk4.asm b/Source/HBIOS/cfg_mk4.asm
index 9c7eade5..a49b0191 100644
--- a/Source/HBIOS/cfg_mk4.asm
+++ b/Source/HBIOS/cfg_mk4.asm
@@ -125,6 +125,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 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]
+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)
 SDCSIOFAST	.EQU	TRUE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/cfg_n8.asm b/Source/HBIOS/cfg_n8.asm
index 12b9fb6e..b813abb9 100644
--- a/Source/HBIOS/cfg_n8.asm
+++ b/Source/HBIOS/cfg_n8.asm
@@ -128,6 +128,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 SDENABLE	.EQU	TRUE		; SD: ENABLE SD CARD DISK DRIVER (SD.ASM)
 SDMODE		.EQU	SDMODE_CSIO	; SD: DRIVER MODE: SDMODE_[JUHA|N8|CSIO|PPI|UART|DSD|MK4|SC]
+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)
 SDCSIOFAST	.EQU	FALSE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/cfg_rcz180.asm b/Source/HBIOS/cfg_rcz180.asm
index be7a00f5..0754bb12 100644
--- a/Source/HBIOS/cfg_rcz180.asm
+++ b/Source/HBIOS/cfg_rcz180.asm
@@ -131,6 +131,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 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]
+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)
 SDCSIOFAST	.EQU	FALSE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/cfg_rcz80.asm b/Source/HBIOS/cfg_rcz80.asm
index 4c5ecadf..669e4ca6 100644
--- a/Source/HBIOS/cfg_rcz80.asm
+++ b/Source/HBIOS/cfg_rcz80.asm
@@ -134,6 +134,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 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]
+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)
 SDCSIOFAST	.EQU	FALSE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/cfg_sbc.asm b/Source/HBIOS/cfg_sbc.asm
index b6080092..c275e36d 100644
--- a/Source/HBIOS/cfg_sbc.asm
+++ b/Source/HBIOS/cfg_sbc.asm
@@ -125,6 +125,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 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]
+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)
 SDCSIOFAST	.EQU	FALSE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/cfg_scz180.asm b/Source/HBIOS/cfg_scz180.asm
index ceec304e..2442318b 100644
--- a/Source/HBIOS/cfg_scz180.asm
+++ b/Source/HBIOS/cfg_scz180.asm
@@ -126,6 +126,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 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]
+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)
 SDCSIOFAST	.EQU	FALSE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/cfg_zeta.asm b/Source/HBIOS/cfg_zeta.asm
index 330071d5..00ecda6e 100644
--- a/Source/HBIOS/cfg_zeta.asm
+++ b/Source/HBIOS/cfg_zeta.asm
@@ -104,6 +104,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 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]
+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)
 SDCSIOFAST	.EQU	FALSE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/cfg_zeta2.asm b/Source/HBIOS/cfg_zeta2.asm
index 07a506a7..ea319e0e 100644
--- a/Source/HBIOS/cfg_zeta2.asm
+++ b/Source/HBIOS/cfg_zeta2.asm
@@ -108,6 +108,7 @@ PPIDE8BIT	.EQU	FALSE		; PPIDE: USE 8-BIT TRANSFERS (CF CARDS MOSTLY)
 ;
 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]
+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)
 SDCSIOFAST	.EQU	FALSE		; SD: ENABLE TABLE-DRIVEN BIT INVERTER IN CSIO MODE
 ;
diff --git a/Source/HBIOS/sd.asm b/Source/HBIOS/sd.asm
index 0faf1d54..e96977cb 100644
--- a/Source/HBIOS/sd.asm
+++ b/Source/HBIOS/sd.asm
@@ -173,7 +173,7 @@ SD_DO		.EQU	%00100000	; UART MSR:5 IS DATA OUT (CARD -> CPU)
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_DSD)		; DUAL SD
-SD_DEVCNT	.EQU	2		; NUMBER OF PHYSICAL UNITS (SOCKETS)
+SD_DEVCNT	.EQU	SDCNT		; NUMBER OF PHYSICAL UNITS (SOCKETS)
 SD_OPRREG	.EQU	$08		; DEDICATED OPERATIONS REGISTER
 SD_OPRDEF	.EQU	%00000001	; QUIESCENT STATE
 SD_INPREG	.EQU	SD_OPRREG	; INPUT REGISTER IS OPRREG
@@ -195,10 +195,11 @@ SD_TRDR		.EQU	Z180_TRDR
 #ENDIF
 ;
 #IF (SDMODE == SDMODE_SC)		; SC
-SD_DEVCNT	.EQU	1		; NUMBER OF PHYSICAL UNITS (SOCKETS)
+SD_DEVCNT	.EQU	SDCNT		; NUMBER OF PHYSICAL UNITS (SOCKETS)
 SD_OPRREG	.EQU	RTCIO		; USES RTC LATCHES FOR OPERATION
 SD_OPRDEF	.EQU	%00001100	; QUIESCENT STATE (/CS1 & /CS2 DEASSERTED)
-SD_CS		.EQU	%00000100	; RTC:2 IS SELECT FOR PRIMARY SPI CARD
+SD_CS0		.EQU	%00000100	; RTC:2 IS SELECT FOR PRIMARY SPI CARD
+SD_CS1		.EQU	%00001000	; RTC:3 IS SELECT FOR SECONDARY SPI CARD
 SD_CNTR		.EQU	Z180_CNTR
 SD_TRDR		.EQU	Z180_TRDR
 #ENDIF
@@ -1464,7 +1465,23 @@ SD_CHKWP:
 SD_SELECT:
 	LD	A,(SD_OPRVAL)
 #IF ((SDMODE == SDMODE_PPI) | (SDMODE == SDMODE_UART) | (SDMODE == SDMODE_SC))
+  #IF (SDMODE == SDMODE_SC)
+	LD	A,(IY+SD_DEV)		; GET CURRENT DEVICE
+	OR	A			; SET FLAGS
+	LD	A,(SD_OPRVAL)		; GET CURRENT OPRVAL BACK
+	JR	NZ,SD_SELECT1		; IF NOT ZERO, DO SECONDARY
+	; ASSERT PRIMARY CS, DEASSERT SECONDARY
+	AND	~SD_CS0
+	OR	SD_CS1
+	JR	SD_SELECT2
+SD_SELECT1:
+	; DEASSERT PRIMARY CS, ASSERT SECONDARY
+	OR	SD_CS0
+	AND	~SD_CS1
+SD_SELECT2:
+  #ELSE
 	AND	~SD_CS			; SET SD_CS (CHIP SELECT)
+  #ENDIF
 #ELSE
 	OR	SD_CS			; SET SD_CS (CHIP SELECT)
 #ENDIF
@@ -1477,7 +1494,12 @@ SD_SELECT:
 SD_DESELECT:
 	LD	A,(SD_OPRVAL)
 #IF ((SDMODE == SDMODE_PPI) | (SDMODE == SDMODE_UART) | (SDMODE == SDMODE_SC))
+  #IF (SDMODE == SDMODE_SC)
+	OR	SD_CS0			; RESET PRIMARY CHIP SELECT
+	OR	SD_CS1			; RESET SECONDARY CHIP SELECT
+  #ELSE
 	OR	SD_CS			; RESET SD_CS (CHIP SELECT)
+  #ENDIF
 #ELSE
 	AND	~SD_CS			; RESET SD_CS (CHIP SELECT)
 #ENDIF
diff --git a/Source/HBIOS/ver.inc b/Source/HBIOS/ver.inc
index 6ef827c1..fd9cafab 100644
--- a/Source/HBIOS/ver.inc
+++ b/Source/HBIOS/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	9
 #DEFINE	RUP	2
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"2.9.2-pre.15"
+#DEFINE BIOSVER	"2.9.2-pre.16"