Re: Z80 its refresh pin

[srkh28@gmail.com]

Hi,

My D780C works fine in my softcard, so it does work correctly. I have
two chips that I try just as a sanity check. Both behave the same -
both refresh low, all other signals good, so its definately my design.
Its just that I have no idea why it behaves this way. My test
equipment tells me the CPU is receiving a nice 2.040MHZ Clock (the C
can handle up to 4MHZ i think). The design is an identical copy of
microsoft's (with a few FPGA implementation tweaks), so i expect it is
a timing issue. Without knowing what could invoke the Z80 into this
state makes it hard to begin looking for it.

thanks for the responses.

Steve.