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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