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You are here: 8051 Tools Development Board Old Versions Rev 1 (1992) More Ideas

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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) Introduction Requirements Description Schematic Wire Wrapping Circuit Board Testing More Ideas Code Library 89C2051 Programmer Other Resources

New Rev 4 Board

A newer version (Rev 4) of this circuit board is available. Rev 4 includes a faster CPU, more memory, more I/O and an optional LCD. We recommend you use Rev 4 for new projects. We are keeping these very old pages on-line for reference to assist people who build the original version of the 8051 development board.
The very old design is difficult to troubleshoot due to the use of an external 27C64 EPROM for the monitor program. We highly recommend you use the new design for any new projects.

Where To Go From Here

some simple circuits to interface leds, speakers, relays, etc to port1 and the 82C55 lines.

some hints about the 8051's built in timers, interrupts, UART and how to do some neat tricks with them.

some hints about how to migrate a design from the development board to a dedicated system... and common errors that turn up when PAULMON is not used anymore.