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  1. Z80MC
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Changes to Z80MC?

 

I'm out of Z80MC CPU and Front Panel cards, and need to order more. Do you have any suggestions for changes or improvements?

Hacky Lee
--
Excellence does not require perfection. -- Henry James
But it *does* require attention to detail! -- Lee Hart
--
Lee A. Hart

 

Hi Lee,
I am loving the Z80MC (thank you!), although so much to learn that is fine. Here are some suggestions for consideration (without altering the original art) :
1- Going back to 15K from 18K to resolve S8 button issue
2- Perhaps a micro piezo speaker
3- Instead of cutting one of the 10 pin connectors I used one of these black single row connectors. Much easier to cut and works fine.
4- If NVRAM is a viable option which I still couldn't figure out if it is plug and play (just like 1802 with super capacitor) or will require a lot of coding to work, nice to make it an option.
5- If there is room in the EPROM, some self test ROM/RAM capability accessed from the front panel would be great.
?
*- I wonder if Z80MC can be used to test another external Z80 for NMOS/CMOS and full functionality
?
Thank you and Best Regards,
Kerem
 

testing z80s....
?
Unplug the built in one and plug in the one in question
if it boots and does all the usual stuff its a good Z80.
?
Over the years the only Z80s I've seen that were bad
were either missing pins (obvious), or subjected to
significant over voltage.? In general it takes a lot
of mistreatment to kill one.? However people do
manage to do that.? Enough ESD and you can
blow up a pin, its input or output circuit on the die.
?
More common this day and age is fake/fraud
marked parts that are not even z80.
?
?
Allison

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