This circuit allows the main 8-bit data bus to be driven to all zeros. This is provided so that the microcode can be written to initialize every register to zero at startup.

Schematic Drawing

OSU8: Simple 8-Bit Microprocessor Design; Paul Stoffregen
http://www.pjrc.com/tech/osu8/sch/zero8.html
Last updated: February 24, 2005
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