First Run ZX81+38 Replika läuft nicht

Es gibt 123 Antworten in diesem Thema, welches 17.224 mal aufgerufen wurde. Der letzte Beitrag (27. Januar 2023 um 01:14) ist von manfred.moser.

  • I thought I mentioned this already, but I re-measured, with help of original case and ZX81 PCB, the position of all drill holes, (for screws) and corrected most of them. I also moved the USB connector a bit away from the edge of the indentation for connectors in the case, so that hopefully you can insert the USB-B connector without having to cut away plastic.

  • Here are some updated details:

    The keyboard data connector was rotated, and that is now fixed, so the original keyboard will work.

    The joystick logic missed pulldown resistors on the base of the Transistors, which is also fixed,

    The CPU clock inverter is built in, so no black block problem.

    All this was fixed in revision 1.9

    someone asked if the ZX81+38 is compatible with wilf rigters WRX16 highness graphics solution, and the answer is that it should be after you add 8K low RAM (at the 8 - 16K bank) as the WRX16 code needs that as a graphics buffer, so a real ZX-81 needed that upgrade too. a better solution would be a code patch so that WRX16 uses HIGH RAM (RAM above the standard 16K) instead of the 8K RAM patch. plus switching the RAM jumper so the RAM will be 32K not 16K

  • Sounds great :thumbsup:

    Thank you for your phantastic work :thanx:

    Elektronikbastler:thumbsup:

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