I bet you used The Art of Digital Design: http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8i/Prosser_The_Art_of_Digital_Design_2ed_1987.pdf http:/

I bet you used The Art of Digital Design: http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8i/Prosser_The_Art_of_Digital_Design_2ed_1987.pdf http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pd... I started with this design for my relay computer, but evolved it to be even simpler: no accumulator. http://relaysbc.sourceforge.net/arch.html http://relaysbc.sourceforge.net/arch.html