Electronics Projects, 8051 Sample Application and 8051 Development Board article
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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
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.
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: 8051-sample-application-and-8051-development-board.rar, link2, link3