Specifications

smartModule Express SMX945 / Software
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7.2 Remote Control over COM Port
7.2.1 Requirements
Serial Null-Modem cable (only RX and TX)
Remote computer: Serial port COM1 or COM2
Host computer: Serial port COM1 or COM2, OS (Windows or MSDOS [FREEDOS]), floppy image file with MSDOS 6.22
or FREEDOS
7.2.2 Limitations
» OS on the Remote computer: MSDOS or FREEDOS.
» Enabling "remote floppy" support will disable all other floppy disks on the remote computer.
» Because of the compatibility mode with PC ANSI and VT-100 protocol, remote keyboard doesn't support the
Alt key and some SHIFT/Ctrl key combinations.
7.2.3 Principles of Functionality
The serial port on the remote computer works in asynchronous mode with an enabled hardware interrupt.
The remote console gets a depressed key on the host computer and transmits it to the remote computer over a serial
link where it is received and stored into the keyboard buffer. From the other side, the TSR serial port routine makes a
buffer of the screen information and periodically scans screen memory to find any changes. These changes are sent via
serial link to the host console program.
Emulation of the floppy works in synchronous mode. The remote BIOS routine hooks the INT13(disk) vector. When the
OS asks for remote disk access, the serial port TSR halts keyboard and video support, sends a special request to the
host computer and waits until this request is supported before restoring the keyboard/video asynchronous protocol.
Windows application RemoteSMX945.exe