The 8051 development board provides an easy-to-use and low-cost way to develop your 8051 based microcontroller projects, without purchasing any other special equipment, such as IC programmers or emulators. All required software is available as a free download, including a C compiler

Features

Standard 87C52 CPU clocked at 22.1184 MHz

50 I/O lines!! All I/O lines are clearly labeled and available at the edge of the prototype construction area

32k SRAM, program variables and code (24k usable for code download)

30k Flash ROM, non-volatile program storage and data logging

High speed baud rates: 115200, 75600, 38400, etc. All standard baud rates are supported (except 300 baud)

Display port, works with standard character-based LCD A 16×2 display will be available from PJRC (see photo below)

Eight LEDs, controlled by 8 dedicated I/O lines (not shared with the 50 I/O lines)

Bus expansion with 4 chip select signals, for adding UARTs, A/D converters and other bus-based peripheral chips.

Unregulated, polarity-protected DC voltage input with 2 position terminal block.

PAULMON2 monitor for easy code development without additional equipment.

Requirements

DC Voltage, 8 to 15 volts (regulated), 50 mA or 300 mA with LCD.
PC Computer With Serial Port, Linux or Microsoft Windows 95-OSR2, 98, 98SE, NT4, 2000.
Assembler or Compiler, usually AS31 or SDCC
Terminal Emulation Program, eg Hyperterminal (windows), Minicom (linux)
Text Editor Program, eg Notepad, Vi, Emacs
Standard 9 pin serial cable (straight through, not null-modem!)

Source: pjrc.com/tech/8051/board4/index.html 8051 Sample Application and 8051 Development Board pcb code alternative link:

FILE DOWNLOAD LINK LIST (in TXT format): LINKS-2493.zip