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I've built a 8-bit breadboard computer using TTL chips based on Ben Eater's excellent video series. However, I have extended this design in serval ways. I have made some videos that describe the improvements I have made to the original design:
This system is based on the Texas Instruments TMS 9995 16-bit microprocessor. The system was designed by Stuart Conner, and has ROMs for either BASIC or Forth programming.
Links
This system is based on the Texas Instruments TMS 9900 16-bit microprocessor. The system was designed by Stuart Conner, and has ROMs for BASIC programming. It also has the battery-backed RAM, allowing you to persist your BASIC programs, and a TMS 9901 systems interface.
Links
TMS 9900 Breadboard/PCB System
This system is based on the Texas Instruments TMS 99110 16-bit microprocessor, and can run just as well with the TMS 99105 processor. The system was designed by Stuart Conner, and has ROMs for BASIC and Forth programming.
Links