ALU (5: Get Shifty!) - Making an 8 Bit pipelined CPU - Part 27 @weirdboyjim
ALU (5: Get Shifty!) - Making an 8 Bit pipelined CPU - Part 27 @weirdboyjim
Uploaded March 2019 | Updated September 2026, 1 week ago
Time to get shifty in here!* We have the add unit so now it's time to build the first of the two main secondary units in the ALU, the shift unit.

The circuit uses five 74LS253's to multiplex 4 lots of inputs to the output. Five of the chips gives us 10 lines, that's 8 data lines, carry out and a spare line that I can't find a use for.

The build portion of this video edited down to less than I expected, I guess it was mostly replication which makes for better viewing if I fast forward it.

* Bad joke but I do love Rick and Morty.
ALU (5: Get Shifty!) - Making an 8 Bit pipelined CPU - Part 27Address Bus Control - Making an 8 Bit pipelined CPU - Part 46ZX Spectrum, Rom Cartridge ResearchShift Unit PCB - Making an 8 Bit pipelined CPU - Part 89Integrating The UART - Making an 8 Bit pipelined CPU - Part 80ALU Control PCB - Making an 8 Bit pipelined CPU - Part 92Sprites (part 1) - VGA from Scratch - Part 22Mailbag #5 Transfer PartsStorage (SD Card Support) - IO from Scratch - Part 8Memory Bridge Solder and Install - Making an 8 Bit pipelined CPU - Part 71New Clock Install - Making an 8 Bit pipelined CPU - Part 84Tilemap PCB (Fix!) - VGA from Scratch - Part 9.5
James Sharman |

ALU (5: Get Shifty!) - Making an 8 Bit pipelined CPU - Part 27

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