srkh28@gmail.com schrieb:
Im putting together a Z80 clone card for the Apple II (softcard copy), but have have come across some unusual behaviour of my Z80 that im not familiar with (its a NEC D780C) - and that is, it asserts its refreshpin low (28), and keeps it there??
The D780C should behave exactly like a Z80 -- I have a few Softcard clones that use this CPU. So try another one, your may have gotten ESD damage.
Patrick