• 1.program

    Michal • 05/26/2024 at 05:01 • 0 comments

  • NED8LED card

    Michal • 05/25/2024 at 05:37 • 0 comments

    First output card to test the functionality of my NED8PC computer.

    The card contains only the most important components: 8 LEDs with resistors, a 74HCT574 output latch and an address decoder consisting of 75154 (54145 - 1 of 16 decoder), 74LS32 (4x OR) and 74LS14 (6x NEG). And of course a couple of 100nF capacitors.

    The address of the card is 00h and is addressed as an output device by the OUT instruction.

  • New front panel labels

    Michal • 05/11/2024 at 03:12 • 0 comments

    I made some progress and at least printed new labels on the front panel.

  • 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.