MZ is back!HEADmain

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diff --git a/v4.0/src/DEV/SMARTDRV/DEVSYM.ASM b/v4.0/src/DEV/SMARTDRV/DEVSYM.ASM
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+BREAK <Device table and SRH definition>
+
+; The device table list has the form:
+SYSDEV  STRUC
+SDEVNEXT        DD      ?       ;Pointer to next device header
+SDEVATT         DW      ?       ;Attributes of the device
+SDEVSTRAT       DW      ?       ;Strategy entry point
+SDEVINT         DW      ?       ;Interrupt entry point
+SDEVNAME        DB      8 DUP (?) ;Name of device (only first byte used for block)
+SYSDEV  ENDS
+
+;
+; Attribute bit masks
+;
+; Character devices:
+;
+; Bit 15 -> must be 1
+;     14 -> 1 if the device understands IOCTL control strings
+;     13 -> 1 if the device supports output-until-busy
+;     12 -> unused
+;     11 -> 1 if the device understands Open/Close
+;     10 -> must be 0
+;      9 -> must be 0
+;      8 -> unused
+;      7 -> unused
+;      6 -> unused
+;      5 -> unused
+;      4 -> 1 if device is recipient of INT 29h
+;      3 -> 1 if device is clock device
+;      2 -> 1 if device is null device
+;      1 -> 1 if device is console output
+;      0 -> 1 if device is console input
+;
+; Block devices:
+;
+; Bit 15 -> must be 0
+;     14 -> 1 if the device understands IOCTL control strings
+;     13 -> 1 if the device determines media by examining the FAT ID byte.
+;           This requires the first sector of the fat to *always* reside in
+;           the same place.
+;     12 -> unused
+;     11 -> 1 if the device understands Open/Close/removable media
+;     10 -> must be 0
+;      9 -> must be 0
+;      8 -> unused
+;      7 -> unused
+;      6 -> unused
+;      5 -> unused
+;      4 -> unused
+;      3 -> unused
+;      2 -> unused
+;      1 -> unused
+;      0 -> unused
+
+DevTyp      EQU     8000H               ; Bit 15 - 1  if Char, 0 if block
+CharDev     EQU     8000H
+DevIOCtl    EQU     4000H               ; Bit 14 - CONTROL mode bit
+ISFATBYDEV  EQU     2000H               ; Bit 13 - Device uses FAT ID bytes,
+                                        ;  comp media.
+OutTilBusy  EQU     2000h               ; Output until busy is enabled
+ISNET       EQU     1000H               ; Bit 12 - 1 if a NET device, 0 if
+                                        ;  not.  Currently block only.
+DEVOPCL     EQU     0800H               ; Bit 11 - 1 if this device has
+                                        ;  OPEN,CLOSE and REMOVABLE MEDIA
+                                        ;  entry points, 0 if not
+
+EXTENTBIT   EQU     0400H               ; Bit 10 - Currently 0 on all devs
+                                        ;  This bit is reserved for future use
+                                        ;  to extend the device header beyond
+                                        ;  its current form.
+
+; NOTE Bit 9 is currently used on IBM systems to indicate "drive is shared".
+;    See IOCTL function 9. THIS USE IS NOT DOCUMENTED, it is used by some
+;    of the utilities which are supposed to FAIL on shared drives on server
+;    machines (FORMAT,CHKDSK,RECOVER,..).
+
+ISSPEC      EQU     0010H                     ;Bit 4 - This device is special
+ISCLOCK     EQU     0008H                     ;Bit 3 - This device is the clock device.
+ISNULL      EQU     0004H                     ;Bit 2 - This device is the null device.
+ISCOUT      EQU     0002H                     ;Bit 1 - This device is the console output.
+ISCIN       EQU     0001H                     ;Bit 0 - This device is the console input.
+
+;Static Request Header
+SRHEAD  STRUC
+REQLEN  DB      ?               ;Length in bytes of request block
+REQUNIT DB      ?               ;Device unit number
+REQFUNC DB      ?               ;Type of request
+REQSTAT DW      ?               ;Status Word
+        DB      8 DUP(?)        ;Reserved for queue links
+SRHEAD  ENDS
+
+;Status word masks
+STERR   EQU     8000H           ;Bit 15 - Error
+STBUI   EQU     0200H           ;Bit 9 - Buisy
+STDON   EQU     0100H           ;Bit 8 - Done
+STECODE EQU     00FFH           ;Error code
+
+;Function codes
+DEVINIT EQU     0               ;Initialization
+DINITHL EQU     26              ;Size of init header
+DEVMDCH EQU     1               ;Media check
+DMEDHL  EQU     15              ;Size of media check header
+DEVBPB  EQU     2               ;Get BPB
+DEVRDIOCTL EQU  3               ;IOCTL read
+DBPBHL  EQU     22              ;Size of Get BPB header
+DEVRD   EQU     4               ;Read
+DRDWRHL EQU     22              ;Size of RD/WR header
+DEVRDND EQU     5               ;Non destructive read no wait (character devs)
+DRDNDHL EQU     14              ;Size of non destructive read header
+DEVIST  EQU     6               ;Input status
+DSTATHL EQU     13              ;Size of status header
+DEVIFL  EQU     7               ;Input flush
+DFLSHL  EQU     15              ;Size of flush header
+DEVWRT  EQU     8               ;Write
+DEVWRTV EQU     9               ;Write with verify
+DEVOST  EQU     10              ;Output status
+DEVOFL  EQU     11              ;Output flush
+DEVWRIOCTL EQU  12              ;IOCTL write
+DEVOPN  EQU     13              ;Device open
+DEVCLS  EQU     14              ;Device close
+DOPCLHL EQU     13              ;Size of OPEN/CLOSE header
+DEVRMD  EQU     15              ;Removable media
+REMHL   EQU     13              ;Size of Removable media header
+
+DevOUT  EQU     16                      ; output until busy.
+DevOutL EQU     DevWrt                  ; length of output until busy
+
+SUBTTL