FreeDOS help system (hhstndrd 1.0.8 en)[shsucdx]

Command: shsucdx

SHSUCDX is an unloadable CD-ROM redirector substitute for MSCDEX. It supports up to 10 drives. Each drive is single-sector buffered and the last 10 directory entries are cached. Each unit from each driver can be assigned a specific drive letter.


shsucdx /D[:][?|*]driver[,[letter][,[unit][,[max]]]] [switches] DRIVER is the name of the device driver installed to control the CD-ROM drive. Prefixing the driver with '?' will silently ignore it if it does not exist (or is not actually a CD-ROM); prefixing with '*' will also ignore it, but a drive will be reserved (see below). LETTER is the first drive letter to assign to the units on this driver. The default is the first available letter. Note: the drive letters assigned to subsequent units will always be higher than those assigned to previous units. UNIT is the first unit on this driver to be assigned a drive. Unit 0 is the default. MAX is the maximum number of units on this driver to be assigned drives. The default is all units (or all remaining units, if UNIT is given).


/D Driver: This option is used to specify the name of the device driver. It can also indicate which unit(s) should be assigned and to what letter. Drive manipulation: At install time, /D can also be used to reserve space for additional drives. Use a single digit to indicate how many drives should be reserved (eg: /D1). (If you should happen to have a device driver name with a single digit, use the '?' prefix.) After installation, the same option will remove the drive(s) that were last assigned. It is possible to specify both forms of /D, in which case the current drive(s) will be removed, then the new drive(s) added. You can only use a drive letter which is smaller or even with the letter in LASTDRIVE / LASTDRIVEHIGH. /L Letter: This option is an alternative to the LETTER component of /D, which it must follow (ie: /D:driver /L:letter). It can also be used to return the number of drives installed (/L:0, will return 255 if not installed) and the letter of each assigned drive (/L:1, /L:2, etc., with A: = 1 and 255 if the drive is not assigned). You can only use a drive letter which is smaller or even with the letter in LASTDRIVE / LASTDRIVEHIGH. /C Uses conventional instead of high memory. /V Memory statistics: When this option is used at installation, a summary of memory usage will be displayed. This summary includes: Static Code and variables Dynamic Data for each drive and paragraph rounding Total Overall memory usage Information: When used with /?, or after installation, this option displays the compile- and run-time options of SHSUCDX. This information includes: 8086/386 The minimum processor required CD root form TRUENAME will return \\D.\A.\ instead of D:\ High Sierra The original format for the CD file system Joliet The Windows format for long names Image on CD Enables access to an image which is itself on a CD /~ Tilde usage: The ISO standard allows for CDs to have names up to 31 characters and Joliet can have names up to 64 characters. When this is reduced to 8.3 for DOS it may lead to duplicated entries. This option will remove the duplication by appending a tilded number after the name (similar to what Windows does). By default, tildes are off. This option is also available after installation. By itself it will toggle the status (ie. if tildes are currently on, /~ will turn them off and vice versa). Tildes can be explicitly turned on or off by adding a '+' or '-' sign (ie: /~+ will turn tildes on, irrespective of the current state). You do not have these problems when using the program DOSLFN. /R Removes Read-only attribute. /I Install anyway even if another redirector is present. /U Unloads the shsucdx driver from memory. /Q Quiet. Prevents display of the sign-on banner (copyright notice).


SHSUCDX has the following EXITCODES (ERRORLEVEL): 0 Uninstalled, help, option set 1-32 Drive number of first installed drive (A=1) 246 Invalid or unknown option 247 Unable to uninstall 248 Not enough memory 249 No drives assigned (ie. not installed) 250 No drive letters available 251 Unit on driver does not exist 252 Invalid or non-existant driver 253 Already installed 254 Unsupported version of DOS 255 386 required


IN CONFIG.SYS / FDCONFIG.SYS: DEVICE=XCDROM.SYS /D:SHSU001 IN AUTOEXEC.BAT: SHSUCDX /D:SHSU001 Example with several CD-ROM drives: In CONFIG.SYS /FDCONFIG.SYS: MENU 1. FreeDOS MENU 2. FreeDOS + IDE CD-ROM (XDROM) MENU 3. FreeDOS + USB CD-ROM (NOVAC) MENU 4. FreeDOS + ASPI CD-ROM (SCSI AIC-75XX 78XX) MENU 5. FreeDOS + IDE CD-ROM + USB CD-ROM + ASPI CD-ROM lastdrivehigh=U 25?DEVICEHIGH=\fdos\bin\xcdrom.sys /D:IDE-CD 35?DEVICEHIGH=\fdos\drivers\usb\usbaspi.sys 35?DEVICEHIGH=\fdos\drivers\usb\usbcd.sys /D:USB-CD 45?DEVICEHIGH=\fdos\drivers\aspi\aspi8dos.sys 45?DEVICEHIGH=\drivers\scsi\aspicd.sys /D:ASPICD In AUTOEXEC.BAT: SHSUCDX /D:IDE-CD,R /D:*ASPICD,S /D:?USB-CD,U /L:0

See also:

(atapicdd.sys) autoexec.bat config.sys doslfn fdconfig.sys (gcdrom.sys) lastdrive lastdrivehigh (mscdex) (udvd.sys) uide.sys (xcdrom.sys) ------------------------------------------------------------------------------ Copyright (C) 2003-2004 Robert Platt, updated 2011 and 2020 by W. Spiegl. This file is derived from the FreeDOS Spec Command HOWTO. See the file H2Cpying for copying conditions.