Re: Strange behavior of #8 button

Kerem Kapkin All Messages By This Member #390 I cannot get S8 work no matter what. While running FFF1 sequence it is using 92mA current at 5V supply.? While testing with the logic probe, 74LS145 inputs to A(15), B(14) and C(13) are fine but D(12) is always LOW. I am using the (b) TTL configuration both on the Z80 card as well as the Front panel. toggle quoted message Show quoted text On Fri, Mar 28, 2025 at 4:04?PM Lee Hart via <leeahart=[email protected]> wrote: Ah; that may be a hint. The Z80MC runs cold". Everything is CMOS, nothing gets hot. What are you using for a power supply? Could its voltage be insufficient? USB supplies are often weak, and the cables so thin that they have lots of voltage drop. I haven't seen this problem with the Z80MC (which draws less than 100mA), but it often happens with the Altaid 8800 (which draws close to 500mA). Lee -- Excellence does not require perfection. -- Henry James But it does* require attention to detail! -- Lee Hart -- Lee A. Hart

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