Merge pull request #185 from wwarthen/dev

FDC hardware auto-detection
5 years ago · b00d25b0ab
22 changed files with 117 additions and 27 deletions
--- a/Binary/RomList.txt
+++ b/Binary/RomList.txt
@ -83,6 +83,8 @@ SBC (SBC_std.rom):
 - Includes support for CVDU and VGA3 boards.  If detected at
   startup, support for video and keyboard is installed
   including VT-100/ANSI terminal emulation.
+ - Auto detects DiskIO v3 floppy disk controller and installs
+   support for two attached 3.5" floppy disks if found
 - Auto-detects PropIO or PropIO V2 and installs associated
   video, keyboard and SD Card support if present.
 - If PropIO, PropIO V2, CVDU, or VGA hardware is detected,
@ -102,8 +104,10 @@ SBC (SBC_simh.rom):
 ZETA (ZETA_std.rom):
 - CPU speed is detected at startup
 - Console on onboard UART serial port at 38400 baud
- - Includes support for on-board floppy disk controller and
-   two attached floppy disks.
+ - Auto-detects FDC and installs 3.5" disk support
+   if found
+ - Auto detects on-board floppy disk controller and installs
+   support for one attached 3.5" floppy disk if found
 - Auto-detects ParPortProp and includes support for it if it
   is attached.
 - If ParPortProp is installed, initial console output is
@ -114,8 +118,8 @@ ZETA (ZETA_std.rom):
 ZETA2 (ZETA2_std.rom):
 - CPU speed is detected at startup
 - Console on onboard UART serial port at 38400 baud
- - Includes support for on-board floppy disk controller and
-   two attached floppy disks.
+ - Auto detects on-board floppy disk controller and installs
+   support for one attached 3.5" floppy disk if found
 - Auto-detects ParPortProp and includes support for it if it
   is attached.
 - Uses CTC to generate periodic timer interrupts.
@ -127,8 +131,8 @@ ZETA2 (ZETA2_std.rom):
 N8 (N8_std.rom):
 - CPU speed is detected at startup
 - Console on Z180 onboard primary ASCI serial port at 38400 baud
- - Includes support for on-board floppy disk controller and
-   two attached floppy disks.
+ - Auto detects onboard floppy disk controller and installs
+   support for two attached 3.5" floppy disks if found
 - Includes support for on-board TMS9918 video and keyboard
   including VT-100/ANSI terminal emulation.
 - Includes support for on-board SD Card as hard disk and
@ -139,6 +143,8 @@ MK4 (MK4_std.rom):
 - Console on Z180 onboard primary ASCI serial port at 38400 baud
 - Includes support for on-board IDE port (CF Card via adapter).
 - Includes support for on-board SD Card port.
+ - Auto detects Dual IDE floppy disk controller and installs
+   support for two attached 3.5" floppy disks if found
 - Auto-detects PropIO or PropIO V2 and installs associated
   video, keyboard and SD Card support if present.
 - Includes support for CVDU and VGA3 boards.  If detected at
@ -156,8 +162,9 @@ RCZ80 (RCZ80_std.rom):
 - Auto support for RC2014 Compact Flash Module
 - Auto support for RC2014 PPIDE Module
 - Support for Scott Baker SIO board may be enabled in config
- - Support for Scott Baker floppy controllers (SMC & WDC) may
-   be enabled in config
+ - Auto detects WDC floppy disk controller and installs
+   support for two attached 3.5" floppy disks if found
+ - Support for SMC floppy controller may be enabled in config
 - Support for J.B. Lang TMS9918 video card may be enabled in config
 - Support for PropIO V2 may be enabled in config (PRPENABLE).  If
   enabled, will auto-detect and install associated
@ -174,8 +181,9 @@ RCZ180 (RCZ180_nat.rom & RCZ180_ext.rom):
 - Auto support for RC2014 Compact Flash Module
 - Auto support for RC2014 PPIDE Module
 - Support for alternative serial modules may be enabled in config
- - Support for Scott Baker floppy controllers (SMC & WDC) may
-   be enabled in config
+ - Auto detects WDC floppy disk controller and installs
+   support for two attached 3.5" floppy disks if found
+ - Support for SMC floppy controller may be enabled in config
 - Support for J.B. Lang TMS9918 video card may be enabled in config
 - You must pick the variant (_ext or _nat) depending
   on which memory module you are using:
@ -203,8 +211,9 @@ RCZ280 (RCZ280_ext.rom, RCZ280_nat.rom, RCZ280_nat_zz.rom):
 - Auto support for RC2014 Compact Flash Module
 - Auto support for RC2014 PPIDE Module
 - Support for Scott Baker SIO board may be enabled in config
- - Support for Scott Baker floppy controllers (SMC & WDC) may
-   be enabled in config
+ - Auto detects WDC floppy disk controller and installs
+   support for two attached 3.5" floppy disks if found
+ - Support for SMC floppy controllers may be enabled in config
 - Support for J.B. Lang TMS9918 video card may be enabled in config
 - You must pick the variant (_ext, _nat, or _nat_zz) depending
   on which platform or memory module you are using:
@ -235,6 +244,9 @@ EZZ80 (EZZ80_std.rom):
 - Includes support for on-board SIO
 - Auto support for RC2014 Compact Flash Module
 - Auto support for RC2014 PPIDE Module
+ - Auto detects WDC floppy disk controller and installs
+   support for two attached 3.5" floppy disks if found
+ - Support for SMC floppy controllers may be enabled in config
 - Support for PropIO V2 may be enabled in config (PRPENABLE).  If
   enabled, will auto-detect and install associated
   video, keyboard and SD Card support if present.
@ -243,5 +255,6 @@ DYNO (DYNO_std.rom):
 - Assumes CPU oscillator of 18.432 MHz
 - Console on Z180 onboard serial ports at 38400 baud
 - Includes support for BQ4842 RTC
+ - Auto detects Dyno floppy disk controller and installs
+   support for two attached 3.5" floppy disks if found
 - Includes support for onboard PPIDE
- - Support for Dyno floppy controllers may be enabled in config
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@ -29,6 +29,7 @@ Version 3.1.1
 - D?M: SD driver fixes for MT011
 - J?C: Added FIND application from Jay Cotton
 - PMS: Preliminary support for I2C-based DS1307 clock
+- WBW: FD driver auto hardware detect (thanks Alan Cox)

 Version 3.1
 -----------
--- a/Source/HBIOS/Config/DYNO_std.asm
+++ b/Source/HBIOS/Config/DYNO_std.asm
@ -36,6 +36,6 @@ ASCIENABLE	.SET	TRUE		; ASCI: ENABLE Z180 ASCI SERIAL DRIVER (ASCI.ASM)
 ;ASCI0CFG	.SET	SER_115200_8N1	; ASCI 0: SERIAL LINE CONFIG
 ;ASCI1CFG	.SET	SER_115200_8N1	; ASCI 1: SERIAL LINE CONFIG
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 ;
 PPIDEENABLE	.SET	TRUE		; PPIDE: ENABLE PARALLEL PORT IDE DISK DRIVER (PPIDE.ASM)
--- a/Source/HBIOS/Config/EZZ80_std.asm
+++ b/Source/HBIOS/Config/EZZ80_std.asm
@ -30,6 +30,9 @@ CRTACT		.SET	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 ;
 CPUOSC		.SET	10000000	; CPU OSC FREQ IN MHZ
 ;
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
+;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
 ;
 PPIDEENABLE	.SET	TRUE		; PPIDE: ENABLE PARALLEL PORT IDE DISK DRIVER (PPIDE.ASM)
--- a/Source/HBIOS/Config/MK4_std.asm
+++ b/Source/HBIOS/Config/MK4_std.asm
@ -36,7 +36,7 @@ VDUENABLE	.SET	FALSE		; VDU: ENABLE VDU VIDEO/KBD DRIVER (VDU.ASM)
 CVDUENABLE	.SET	TRUE		; CVDU: ENABLE CVDU VIDEO/KBD DRIVER (CVDU.ASM)
 VGAENABLE	.SET	TRUE		; VGA: ENABLE VGA VIDEO/KBD DRIVER (VGA.ASM)
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.SET	FDMODE_DIDE	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
 ;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/Config/RCZ180_ext.asm
+++ b/Source/HBIOS/Config/RCZ180_ext.asm
@ -43,7 +43,7 @@ SIOENABLE	.SET	FALSE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 ;
 TMSENABLE	.SET	FALSE		; TMS: ENABLE TMS9918 VIDEO/KBD DRIVER (TMS.ASM)
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
 ;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/Config/RCZ180_nat.asm
+++ b/Source/HBIOS/Config/RCZ180_nat.asm
@ -43,7 +43,7 @@ SIOENABLE	.SET	FALSE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 ;
 TMSENABLE	.SET	FALSE		; TMS: ENABLE TMS9918 VIDEO/KBD DRIVER (TMS.ASM)
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
 ;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/Config/RCZ280_ext.asm
+++ b/Source/HBIOS/Config/RCZ280_ext.asm
@ -42,6 +42,9 @@ UARTENABLE	.SET	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 ACIAENABLE	.SET	TRUE		; ACIA: ENABLE MOTOROLA 6850 ACIA DRIVER (ACIA.ASM)
 SIOENABLE	.SET	TRUE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 ;
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
+;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
 ;
 PPIDEENABLE	.SET	TRUE		; PPIDE: ENABLE PARALLEL PORT IDE DISK DRIVER (PPIDE.ASM)
--- a/Source/HBIOS/Config/RCZ280_nat.asm
+++ b/Source/HBIOS/Config/RCZ280_nat.asm
@ -44,6 +44,9 @@ UARTENABLE	.SET	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 ACIAENABLE	.SET	TRUE		; ACIA: ENABLE MOTOROLA 6850 ACIA DRIVER (ACIA.ASM)
 SIOENABLE	.SET	TRUE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 ;
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
+;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
 ;
 PPIDEENABLE	.SET	TRUE		; PPIDE: ENABLE PARALLEL PORT IDE DISK DRIVER (PPIDE.ASM)
--- a/Source/HBIOS/Config/RCZ80_std.asm
+++ b/Source/HBIOS/Config/RCZ80_std.asm
@ -37,7 +37,7 @@ SIOENABLE	.SET	TRUE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 TMSENABLE	.SET	FALSE		; TMS: ENABLE TMS9918 VIDEO/KBD DRIVER (TMS.ASM)
 TMSTIMENABLE	.SET	FALSE		; TMS: ENABLE TIMER INTERRUPTS (REQUIRES IM1)
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
 ;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/Config/RCZ80_zrc.asm
+++ b/Source/HBIOS/Config/RCZ80_zrc.asm
@ -39,7 +39,7 @@ SIOENABLE	.SET	TRUE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 TMSENABLE	.SET	FALSE		; TMS: ENABLE TMS9918 VIDEO/KBD DRIVER (TMS.ASM)
 TMSTIMENABLE	.SET	FALSE		; TMS: ENABLE TIMER INTERRUPTS (REQUIRES IM1)
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
 ;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/Config/SBC_std.asm
+++ b/Source/HBIOS/Config/SBC_std.asm
@ -32,7 +32,7 @@ VDUENABLE	.SET	FALSE		; VDU: ENABLE VDU VIDEO/KBD DRIVER (VDU.ASM)
 CVDUENABLE	.SET	TRUE		; CVDU: ENABLE CVDU VIDEO/KBD DRIVER (CVDU.ASM)
 VGAENABLE	.SET	TRUE		; VGA: ENABLE VGA VIDEO/KBD DRIVER (VGA.ASM)
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.SET	FDMODE_DIO3	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
 ;
 IDEENABLE	.SET	FALSE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/Config/SCZ180_126.asm
+++ b/Source/HBIOS/Config/SCZ180_126.asm
@ -45,7 +45,7 @@ SIOENABLE	.SET	FALSE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 ;
 TMSENABLE	.SET	FALSE		; TMS: ENABLE TMS9918 VIDEO/KBD DRIVER (TMS.ASM)
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
 ;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/Config/SCZ180_130.asm
+++ b/Source/HBIOS/Config/SCZ180_130.asm
@ -52,7 +52,7 @@ SIOENABLE	.SET	FALSE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 ;
 TMSENABLE	.SET	FALSE		; TMS: ENABLE TMS9918 VIDEO/KBD DRIVER (TMS.ASM)
 ;
-FDENABLE	.SET	FALSE		; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
+FDENABLE	.SET	TRUE		; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
 FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|DIDE|N8|DIO3]
 ;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/Config/SCZ180_131.asm
+++ b/Source/HBIOS/Config/SCZ180_131.asm
@ -50,7 +50,7 @@ ASCIENABLE	.SET	TRUE		; ASCI: ENABLE Z180 ASCI SERIAL DRIVER (ASCI.ASM)
 ACIAENABLE	.SET	FALSE		; ACIA: ENABLE MOTOROLA 6850 ACIA DRIVER (ACIA.ASM)
 SIOENABLE	.SET	FALSE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|ZETA2|DIDE|N8|DIO3|RCSMC|RCWDC|DYNO|EPWDC]
 ;
 IDEENABLE	.SET	FALSE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/Config/SCZ180_140.asm
+++ b/Source/HBIOS/Config/SCZ180_140.asm
@ -46,7 +46,7 @@ ACIAENABLE	.SET	FALSE		; ACIA: ENABLE MOTOROLA 6850 ACIA DRIVER (ACIA.ASM)
 ;
 SIOENABLE	.SET	FALSE		; SIO: ENABLE ZILOG SIO SERIAL DRIVER (SIO.ASM)
 ;
-FDENABLE	.SET	FALSE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
+FDENABLE	.SET	TRUE		; FD: ENABLE FLOPPY DISK DRIVER (FD.ASM)
 FDMODE		.SET	FDMODE_RCWDC	; FD: DRIVER MODE: FDMODE_[DIO|ZETA|DIDE|N8|DIO3]
 ;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
--- a/Source/HBIOS/fd.asm
+++ b/Source/HBIOS/fd.asm
@ -648,9 +648,58 @@ FD_GEOM:
 ;
 FD_INIT:
 	CALL	NEWLINE			; FORMATTING
-	PRTS("FD: IO=0x$")
+	PRTS("FD: MODE=$")
+;
+#IF (FDMODE == FDMODE_DIO)
+	PRTS("DIO$")
+#ENDIF
+;
+#IF (FDMODE == FDMODE_ZETA)
+	PRTS("ZETA$")
+#ENDIF
+;
+#IF (FDMODE == FDMODE_DIO3)
+	PRTS("DIO3$")
+#ENDIF
+;
+#IF (FDMODE == FDMODE_ZETA2)
+	PRTS("ZETA2$")
+#ENDIF
+;
+#IF (FDMODE == FDMODE_DIDE)
+	PRTS("DIDE$")
+#ENDIF
+;
+#IF (FDMODE == FDMODE_N8)
+	PRTS("N8$")
+#ENDIF
+;
+#IF (FDMODE == FDMODE_RCSMC)
+	PRTS("RCSMC$")
+#ENDIF
+;
+#IF (FDMODE == FDMODE_RCWDC)
+	PRTS("RCWDC$")
+#ENDIF
+;
+#IF (FDMODE == FDMODE_DYNO)
+	PRTS("DYNO$")
+#ENDIF
+;
+#IF (FDMODE == FDMODE_EPFDC)
+	PRTS("EPFDC$")
+#ENDIF
+;	
+	PRTS(" IO=0x$")
 	LD	A,FDC_MSR
 	CALL	PRTHEXBYTE
+	CALL	FD_DETECT		; CHECK FOR FDC
+	JR	Z,FD_INIT00		; CONTINUE IF FOUND
+	PRTS(" NOT PRESENT$")		; NOT ZERO, H/W NOT PRESENT
+	OR	$FF			; SIGNAL FAILURE
+	RET				; BAIL OUT
+;	
+FD_INIT00:	
 	PRTS(" UNITS=$")
 	LD	A, FD_DEVCNT + '0'
 	CALL	COUT
@ -688,6 +737,24 @@ FD_INIT0:
 ;
 	RET
 ;
+; HARDWARE PRESENCE DETECTION
+;
+; CURRENTLY JUST DETERMINES IF FDC EXISTS AT PRE-DEFINED ADDRESS,
+; DOES NOT ATTEMPT TO DETERMINE THE ACTUAL VARIANT.
+;
+FD_DETECT:
+	IN	A,(FDC_MSR)	; READ MSR
+	CP	$80
+	JR	Z,FD_DETECT1	; $80 IS OK
+	CP	$D0
+	JR	Z,FD_DETECT1	; $D0 IS OK
+	RET			; NOPE, ABORT WITH ZF=NZ
+;
+FD_DETECT1:
+	IN	A,(FDC_MSR)	; READ MSR AGAIN
+	CP	$80
+	RET			; $80 OK, ELSE NOT PRESENT
+;
 ; UNIT INITIALIZATION
 ;
 FD_INITUNIT:
--- a/Source/Images/d_bp/u0/UNZIPZ4.COM
+++ b/Source/Images/d_bp/u0/UNZIPZ4.COM
--- a/Source/Images/d_cpm22/u0/UNZIPZ4.COM
+++ b/Source/Images/d_cpm22/u0/UNZIPZ4.COM
--- a/Source/Images/d_zsdos/u0/UNZIPZ4.COM
+++ b/Source/Images/d_zsdos/u0/UNZIPZ4.COM
--- 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.76"
+#DEFINE BIOSVER	"3.1.1-pre.77"
--- 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.76"
+	db	"3.1.1-pre.77"
 	endm