6530 Programmer's Guide

Block Mode Operation
6530 Programmer’s Guide 3-77
drive is an ASCII character in the range of 41H through 5AH that
specifies the current default drive of the workstation or PC.
DC2 is a control character (12H) used to delimit the following string
values.
string1 is an ASCII string of 1 or more characters that represents
the full pathname (starting from the root and including the backslash)
of the current directory for the specified drive. If the length of
string1 is 0, the 6530 received an operating system error when
retrieving the information.
string2 is an ASCII string of 1 or more characters that represents
the network redirection entry for the specified drive. If the length of
string2 is 0, either the 6530 received an operating system error when
retrieving the information or the specified drive is not in the network
redirection table.
terminator comprises the control characters ETX (03H) and
LRC (Longitudinal Redundancy Check) in block mode.
Device Control This group of escape sequences performs operations on devices attached
to the workstation or PC. See “Device Control” on page 1-11, for general
information about device control.
Print Page (Esc 0)
The Esc 0 sequence transfers the contents of the currently selected page to
the workstation or PC device specified by the Auxl parameter. The 6530
reserves a one-page print buffer to save the data to be printed. When the
print function is invoked, the selected page is moved into the print buffer.
because this is saved in a separate area of memory, the keyboard need not
be locked while the data is printing even if the currently selected page is
also the currently displayed page.
Print requests from your application always take precedence over local
requests by the user. If your application requests a print operation while
one is in process, the 6530 performs the following:
Aborts the current print operation; displays an error message
(PRINT ABORT) in the error line and sounds the bell
Sends a carriage return (CR), followed by a form feed (FF), to the
printer interface
Initiates the application’s print request