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8 Bit minicomputer based on 74-series logic

An 8-bit mini built out of relatively simple ic's, probably not going to be finished anytime soon.

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At the moment I am still working on some aspects of the design but so far what I've got is: An 8-bit ALU with 4 general purpose registers and an FLAGS register containing both the conditional and carry flags. Two of these registers and the flags register are connected to the "left" operand input of the ALU, the other two are connected to the "right" operand input.

  • 4 × Quad elex prototyping board Printed circuit board / Logic prototyping board
  • 2 × 74LS181 Logic ICs / Arithmetic and Parity Functions
  • 4 × 74HCT374 Logic ICs / Registers
  • 1 × 74HCT273 Logic ICs / Registers
  • 3 × 74HCT241 Logic ICs / Buffers, Drivers, Transceivers

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J. Peterson wrote 08/27/2015 at 06:06 • point

Similar project using 74C series logic.  Done a long time ago. http://www.saccade.com/writing/projects/CS428/WireWrap.html

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Peabody1929 wrote 06/11/2014 at 17:54 • point
Take a look at AMD's 2901 device.

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Michael A. Morris wrote 04/27/2014 at 19:33 • point
Will be looking forward to your continuing development of this project.

I have made a number of paper designs for ALUs using TTL parts, but time and technology have taken me off that path. However, Dieter Meuller has implemented a TTL version of the 6502 microprocessor: http://6502.org/users/dieter/m02/m02.htm. It's approach to the control logic may be of interest.

If you decide to pursue a similar approach you may consider using a tool that I use for my designs: https://github.com/MorrisMA/MAM65C02-Processor-Core/tree/master/Utils

Good luck and looking forward to following your progress.

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