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PJRC Store 8051 Dev Board, $79 LCD 20x2 Display, $11 Serial Cable, $5 12 Volt Power, $8 More Components... 8051 Tools Main Page Software PAULMON Monitor Development Board Features Photos Getting Started Example Code Memory Map Ports & Pinouts Schematic & Parts Circuit Board Construction Troubleshooting Old Versions Revision List Rev 4 (2002) Rev 3 (2001) Rev 2 (1997) Rev 1 (1992) Code Library 89C2051 Programmer Other Resources

Development Board Revisions

Rev	Year	RAM	Flash	PAULMON	I/O	Voltage	LCD
5	2004	32k	30k	2.1	50 + 8 LED (Not Shared) + 3 Diagnostic LEDs	8-15V Unregulated Two Connectors	Yes
4	2002	32k	30k	2.1	50 + 8 LED (Not Shared)	8-15V Unregulated	Yes
3	1999	8k	32k	2.1	34 (8 LED Shared)	8-15V Unregulated	No
2	1997	8k	32k	2.0	34 (8 LED Shared)	5V and 12V Regulated	No
1	1992	8k	0k	1.0	58 ??	5V Regulated	No

You can go to the page for any board revision by selecting its photo below.

Rev 5
Rev 4	Rev 3
Rev 2	Rev 1