Re: [N8VEM-S100:7226] Re: Z80 CPU board setup issue

[Gary Kaufman <geka...@gmail.com>]

Harold and David  -

The picture I posted was confusing (sorry).  The jumper on JP9 is only 
on a single pin - so not really doing anything!

A few quick thoughts -

- Try a slower clock speed, like 2mhz for the CPU in case it's a timing 
issue.
- Add wait states.
- Try a "HALT" eprom - just fill an eprom with 076H and see if the Halt 
LED comes on.

- Gary

On 6/12/2015 10:56 AM, David Fry wrote:
> Harold,
>
> check all the jumpers on your Z80 board again against Gary's picture 
> which agrees with my setup except for one jumper (JP9 which is a NC 
> pin on both the 27C64 and 28C64 anyway)
>
> David Fry