BD-52, my single-board computer design





The BD52 is an 8032 based single board computer that I developed and marketed in the mid 1990s. This was shipped as a complete development package which included:



Selling price was $200 US.
 
The BD52 board contains the following hardware:

  • 8032 microcontroller
  • 64K of static RAM
  • 32K of ROM (EPROM)
  • RS-232 serial port
  • 2K I2C EEPROM
  • 7-channel relay driver
  • 4-channel analog to digital convertor.
  • Watchdog and power-monitor
  • Regulated power supply.
  • Buss expansion connector.
  • Programmable Logic Array with configuration jumpers to accomodate many different configuration options, and to provide hardware support for debug features not normally available on the 805x family processors. 

Library functions were included with the C compiler to provide access to all programmable devices.
With the included software, the BD52 could be run in several modes:



  • Normal operation with code in EPROM
  • Code downloaded into RAM on the board, the PAL provided a means of mapping RAM to CODE memory and downloading to it (not normally supported on the 805x family). This allowed full debugging, including the ability to breakpoint and patch code.
  • Simulation on the PC with I/O occuring on the board.


Quite a few BD52s were sold and it received good reviews, however the cost of manufacturing in Canada and problems/costs in shipping to the U.S. eventually resulted in the decision to discontinue the product.
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