• NED8CPU - CPU Z80 card

    Michal • 03/24/2024 at 04:05 • 0 comments

    The card itself contains a CPU UA880D which is a clone of the Z80 CPU operating at up to 4MHz. Furthermore, an oscillator with a frequency divider with the possibility of adjustment with a jumper. And a reset circuit.

    Unfortunately, I didn't avoid using wire jumpers, which also have to be this long due to an error in the design (I didn't make holes for them). In addition, I chose the wrong spacing of the CPU socket, so I also made a reduction.

  • NED8PC is sponsored by PCBway!

    Michal • 03/13/2024 at 03:47 • 0 comments

    Thanks to PCBway, I was able to make a professional PCB for another card, the NED8CPU.

    The card is double-sided, metallized, including printing, and was at home within 2 weeks of ordering.

    Now I will install and test :-)

  • NED8RAM64 card

    Michal • 02/26/2024 at 04:13 • 2 comments

    This is a card with 64 KB of RAM memory.

  • NED8DMA-VYP card

    Michal • 12/24/2023 at 04:31 • 0 comments

    I finished the DMA memory write card and faceplate


    The labels on the front panel are still provisional.

  • Basic skeleton

    Michal • 11/29/2023 at 16:53 • 0 comments

    I already have the basic skeleton of my computer ready, so it's starting to take shape. On the top floor is the backplane with the cards and on the bottom is the ATX power supply and HDD.


  • NED8NOP card

    Michal • 11/27/2023 at 03:53 • 0 comments

    A simple tool for testing the function of the CPU, which uses HW to impose a NOP instruction on the processor, which only increases the address and thus performs a basic test of the function.


  • NED8DMA-LED card

    Michal • 11/26/2023 at 05:49 • 0 comments

    I finished the display DMA LED card.

  • The power supply is not working!

    Michal • 11/19/2023 at 11:53 • 0 comments

    So it turned out that the power supply, which was supposed to be functional, does not work. Fortunately, I have a promised old PC from which I will have a larger but functional source.

  • Backplane is complete

    Michal • 11/12/2023 at 09:48 • 0 comments

    Today I had fun and completed the backplane.

  • PCBs have arrived

    Michal • 11/07/2023 at 18:11 • 0 comments

    The ordered PCB and a bunch of other parts arrived today, so the build can begin.