Hi folks, 8085-based phone system weirdness continues and I'm beginning to wonder if the PSU rails are all coming up in time for RESET to go high - given there's 4116 DRAMs in there isn't there supposed to be a proper power up order?
While I look at using a 20-pin ATX PSU to run this machine temporarily I need a safe way to reset the CPU rather than constantly power cycling. The RESET line comes from an ICL7611 op-amp via an MC14081B through pins 1-4 of a 74LS04 and I need to pull it low for longer than 3 clock cycles. I wish I had a schematic to show! Cheers, -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?
