µ[micro]electronics info

A weblog focused on interesting circuits, ideas, schematics and other information about microelectronics and microcontrollers.




Because I have not tested all electronic circuits mentioned on this pages, I cannot attest to their accuracy; therefore, I do not provide a warranty of any kind and cannot be held responsible in any manner.

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N8VEM - Single Board Computer

The N8VEM Single Board Computer is a home brew Z80 small computer project. It is made in the style of vintage computers of the mid to late 1970's and early 1980's using a mix of classic and modern technologies.

Computer is designed to be a low cost Single Board Computer with simple IO. The current design supports a UART for serial IO and PPI for parallel IO. Includes RTC for time keeping with battery back up and a small amount of NVRAM storage. While low cost is a key goal, the SBC is also designed to be a component in a larger bus based system.

Current description of the SBC is:

  • Z80 CPU 4MHz
  • 512K SRAM
  • 1M EPROM
  • 16C550 UART with connector
  • 82C55 PPI with connector
  • DS1302 RTC with battery backup with small amount of NVRAM
  • ECB buffers, logic, and connector
  • Standard PC drive connector power supply interface, +5V only
  • Reset key with external connector
  • Power LED
  • Boots to RAM based debug monitor
  • CP/M 2.2 available at monitor prompt

Link: N8VEM SBC home page
N8VEM Google discussion group
N8VEM practically

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