RE: 4 Bit ALU

phoenixcomm — Sat, 05 Nov 2016 21:55:06 GMT

I LOVE IT.. somebody with more patience than I. I worked for Interdata 76 - 78. In 1980 I built a 16bit Z-80 out of AMD-2901 4bit slices. I also added more register sets.

Back in 68 I also did something cruder than what you are doing with RTL my memory was just 8 bits but I think I used like 12 relays for each word 8data + 4control

I used a Rotary Stepping Switch for addressing and it could add and subtract a multiplication was done the hard way ie no barrel shifter.

By the way If you are curious I have a copy of the Mick and Brick book (how to build a 370) if you would like to have a copy just em me.

GUTS!!

RE: 4 Bit ALU

dougw — Sat, 05 Nov 2016 19:58:52 GMT

Those cards look like they have headers suitable for wire-wrapping, potentially reducing the number of breadboards you need....

RE: 4 Bit ALU

DAB — Sat, 05 Nov 2016 18:10:15 GMT

I admire your patience in putting all of those wires in.

DAB