BASIC User Exits

User exits allow calling direct system code from a BASIC oconv or iconv function. Many of the functions performed by user exits can be achieved by using the system() function or the execute statement with the appropriate TCL command or BASIC statement.

The following BASIC user exits are presented:

u$pl.mon.data User Exit	Returns monitor information.
u000e User Exit	Gets the name of the current account.
u0003 User Exit	Returns the TCL command invoking the FlashBASIC or BASIC program.
u0004 User Exit	Returns term settings in dynamic array format.
u0005 User Exit	Clears the type-ahead buffer.
u0010 User Exit	Creates a phantom process.
u0011 User Exit	Gets the port number of the scheduler process.
u001c User Exit	Gets the number of attributes (elements) after a matread.
u001e User Exit	Returns the checksum of a string.
u001f User Exit	Returns the last shutdown status.
u0033 User Exit	Converts a decimal number into a Roman numeral.
u0039 User Exit	Reads an absolute disk sector. This user exit provides more information than u14a.
u005b User Exit	Obtains and manipulates external strings, allowing the caller (likely non-FlashBASIC) to store data without writing to a file or storing it in BASIC string space.
u007a User Exit	Updates a binary item from a FlashBASIC or BASIC program.
u0079 User Exit	Returns the where status for the specified PCB (Process Control Block) FID, and its return stack information.
u0089 User Exit	Converts a hexadecimal number (in a string) to a binary number.
u009d User Exit	Encodes or decodes a string of characters.
u009e User Exit	Replaces all occurrences of a specified string found in a specified string with the text in another specified string.
u009f User Exit	Converts a binary number to a hexadecimal number (32-bit limit).
u00b9 User Exit	Returns a soundex value for a specified string.
u00ba User Exit	Performs BIOS INT 10 calls to change the video screen attributes on the console.
u014a User Exit	Reads an absolute disk sector.
u014b User Exit	Writes an absolute disk sector.
u017e User Exit	Allows output of any character to the terminal or spooler.
u01b6 User Exit	Converts a numeric expression to the number of units as defined by the TCL set-units, set-dozens, set-decimal, or set-thousands commands.
u0209 User Exit	Returns only alphabetical and numeric characters.
u0358 User Exit	Allows character input combined with an eoi (end-of-input) character.
u0c User Exit	Encrypts a password.
u1072 User Exit	Returns a dynamic array, sorted in ascending order.
u10b9 User Exit	Converts American currency punctuation ($1,000.00) to international punctuation (#1.000,00)
u11b6 User Exit	Converts a unit expression to a numeric value as defined by the TCL set-units, set-dozens, set-decimal, or set-thousands commands.
u1209 User Exit	Breaks a single line of text into multiple lines of text with each line being no longer than the a specified number of characters.
u1a User Exit	Returns the tape block size.
u1f User Exit	Returns a string of digits indicating the boot status.
u20b9 User Exit	Converts international currency punctuation (#1.000,00) to American punctuation ($1,000.00).
u21 User Exit	Converts upper case to lower case.
u2117 User Exit	Returns information about the current process.
u21a3 User Exit	Opens a file, or reads the next attribute from a file.
u21b6 User Exit	Returns a numeric value representative of the current unit setting defined by the TCL set-units, set-dozens, set-decimal, or set-thousands commands.
u22 User Exit	Converts lower case to upper case.
u222d User Exit	Retrieves the CC pointer item information from binary items.
u28 User Exit	Returns the number of saves that have occurred since the last full restore.
u3060 User Exit	Encrypts a character string. The result is always an 8-character hexadecimal string.
u3079 User Exit	Returns the PCB FID of the current process, or returns the port number of the current process.
u307a User Exit	Suspends processing until a specified time.
u3090 User Exit	Aborts a FlashBASIC or BASIC program.
u313c User Exit	Returns the diskette drive type and density selected.
u352e User Exit	Retrieves statistical information about the use of buffers by the D3 monitor.
u3b User Exit	Returns information about the port.
u3f User Exit	Converts an ASCII hexadecimal-format string to binary, and sends it to the printer.
u4070 User Exit	Directs all subsequent output to the terminal. This is the same as the BASIC printer off statement.
u407a User Exit	Sets a port to sleep for a specified number of seconds. This is the same as the BASIC sleep statement.
u4117 User Exit	Returns the PCB (Process Control Block) in hexadecimal for the current process.
u413c User Exit	Sets the format type to the given format media.
u4209 User Exit	Parses the input into discrete words.
u47 User Exit	Writes a string in ASCII or hexadecimal to a specific location in a frame.
u48 User Exit	Reads a specific location of a frame and returns the content.
u50bb User Exit	Returns the port number, user-ID, and current account for this process, just like the TCL who command.
u5117 User Exit	Returns the PCB in hexadecimal for port 0.
u5e User Exit	Clears the internal BASIC heading and footing so that subsequent heading and footing statements display properly at the top of the next page.
u60ba User Exit	Flushes all memory to disk, and shuts down the D3 system.
u60bb User Exit	Returns the user-ID and account name of the current process.
u6193 User Exit	Removes all but the last three characters from the data passed from the variable.
u63 User Exit	Sets/clears privilege bits.
u65 User Exit	Returns the estimated number of items in the most recently referenced file.
u6d User Exit	Sends shutdown message.
u7000 User Exit	Returns the size of an item.
u70ba User Exit	Forces the system to restart.
u71 User Exit	Sets the HAForceCheck option programmatically.
u7193 User Exit	Converts the American date format (mm/dd/yy) to international format (dd/mm/yy).
u8194 User Exit	Returns the number of items selected by the most previous select.
u83 User Exit	Sets a group lock.
u84 User Exit	Clears a group lock from the group lock table.
u86 User Exit	Sets the root fid of the index.
u90 User Exit	Returns the file of files number for the file most previously referenced in the FlashBASIC or BASIC program.
u90e3 User Exit	Flips the parity bit on the input.
u91 User Exit	Reads and writes D3 shell variables.
u9116 User Exit	Logs on a given port.
u92 User Exit	Follows the links of a frame.
u98 User Exit	Retrieves the links for the specified fid.
ua116 User Exit	Logs of the specified port.
ub070 User Exit	Returns the absolute value of a variable, stripping the leading -, if any.
ub0ba User Exit	Reads one string of memory.
uc0ba User Exit	Writes a value into a memory address.
ud0ba User Exit	Reads a character byte from a serial port.
ue0ba User Exit	Writes a character byte out to a serial port.
uf070 User Exit	Starts and stops multiuser mode, and returns information about the number of serial ports, PIBs, phantom PIBs, licensed users, users logged on, and the maximum number of users that can log on.
xsuex User Exit	Obtains and manipulates external strings, allowing the caller (likely non-FlashBASIC) to store data without writing to a file or storing it in BASIC string space.