> Hi everyone, my name is Dimitri,
> this is a bit off-topic since it's not related to MAME, but I believe you can help me
> I'm trying to understand how a circuit I own works. It uses many 7400 and 4000 series
> logic, and my aim is to emulate its functions using a microcontroller. I'm a
> programmer but quite poor with digital electronic.
> I was wondering if there were a simple way to simulate this circuit on my computer in
> order to understand the logic involved.
> Essentially it is an audio echo machine from '80s: the analog audio is converted to
> digital (with a SAR + DAC), then stored into DRAM and converted back to digital after
> some time. The part that I'm trying to simulate is the DRAM controller and the logic
> needed to start-stop the conversion.
> I tried LTSpice and Proteus ISIS but I wish there was a simpler and more friendly
> Thanks and sorry for my english.
Could you post a circuit diagram?