Redone a previous board

A board that I made previously took too much glue logic and a multiplexing circuit was not working well enough so I decided to redo this board.

  • 2 x 6850 UARTs with 8253 counter for baud rates
  • 6840 Timer/Counter
  • Dallas DS1501Y RTC
  • 68A21 PIO
  • 8255 PIO
  • AD7824 4-channel ADC
  • DAC08 8-bit DAC
  • ATF1504 84-pin CPLD for SPI and glue logic

dscn0353

The eagle schematic and CPLD file are available at Sourceforge:

https://sourceforge.net/projects/monsputer-bios/files

 

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