Just use any of the compter language, say C,C++ make a program or rather i should say a software and then connect the hardware to the printer port and then execute the program to operate the hardware.
For example make a simple program to glow an LED through the pc, you can even use a micro-processor for the same...
external serial ATA is six times faster
External serial ATA known as eSATA is up to six times faster than USB or Firewire.
In the past external modems connected to the COM (or serial) port. However, most modern external hardware is USB these days, modems are no exception.
A universal asynchronous receiver/transmitter, abbreviated UART ( /ˈjuːɑrt/), is a type of "asynchronous receiver/transmitter", a piece of computer hardware that translates data between parallel and serial forms
External serial ATA (eSATA) hard drives is up to six times faster than USB or FireWire.
A universal asynchronous receiver/transmitter, abbreviated UART ( /ˈjuːɑrt/), is a type of "asynchronous receiver/transmitter", a piece of computer hardware that translates data between parallel and serial forms
the interface which is used to see the commands in serial communication with external devices in a windows operated PC.
The interface between the detector and external devices is typically provided by a communication protocol or interface standard, such as USB, Ethernet, or serial communication. This allows for data transfer, control signals, and power supply to be exchanged between the detector and external systems. The interface enables the integration of the detector into broader systems for data analysis, monitoring, or control applications.
External SATA (eSATA) is up to six times faster than USB or Fire Wire
In the past external modems connected to the COM (or serial) port. However, most modern external hardware is USB these days, modems are no exception.
To configure the clock rate for the hardware connections on serial interfaces such as network interface modules (NIMs) and interface processors to an acceptable bit rate, use the clock rate interface configuration command. Use the no form of this command to remove the clock rate if you change the interface from a DCE to a DTE device. Using the no form of this command on a DCE interface sets the clock rate to the hardware-dependent default value.
Its a 8051 based CPU with inbuilt flash memory(ISP - In-System Programming). It can be flashed through SPI(serial peripheral Interface). AT89C51RD2 has similar features but its flash memory can be programmed through serial interface (RS-232).