Hey All,
Thanks again so I am having no luck with trouble shooting this circuit, so my last hope is opening it up to the community.
any Help would be appreciated!!!!
The circuit that is a part of an old 1980s Soundtracs PC Midi Mixing Console. This is the computer section. It controls all the mutes of the console.
All the clocks Lines and Voltages look to be present.
Connector 11 (TEST POINT) Shows
RXCLK = 500khz Clock signal
CLCK = 4 Mhz Clock Signal
INT = HIGH
HALT = LOW
WA = 1Mhz Clock
RD = HIGH
Currently have no response from the keypad and No data on the 7 segment displays.
I have a Scope so can upload waveforms if need be.
Could anyone point me to a source where I could Purchase the Z80 Parts if this need to be done further down the path.
Z0840006PSC Z80 CPU 2D
Z84C0010PEC Z80 CPU HU
Thanks !!!