Re: [N8VEM: 15616]

[rbruinsma <rbma...@gmail.com>]

No, I don't have a smaller one than 1.8432 Mhz but I could buy one.

Op zondag 17 februari 2013 20:50:19 UTC+1 schreef vk5dg het volgende:
> Have you got a slower oscillator module that you could temporarily use to clock 
> the Z80, preferably 1MHz or less?   The Z80 is a static device and can be clocked
> down as slow as you like.  The reason I ask is that simple logic probes may 
> not be responsive above relatively low frequencies - I know mine is useless above
> 1 MHz.
>
> David
>
> On Monday, February 18, 2013 5:19:48 AM UTC+10:30, Sergey wrote:
> > >  When I measure the voltage between pin11 and 29 on the CPU I get 1.4V but
> > > when I measure between pin 11 and ground on the power supply pin I get 5.0V
> > > Any Idea where to look? What could cause the 1.4V reading on the CPU?
> >
> > This is not good. If you have your ICs socketed, I'd take them out
> > first, and check continuity on power lines - between power connector
> > to ICs. Note that power pin numbers differ between ICs. For most 74*
> > logic, ground is the last pin in the first row (7 for 14 pin package,
> > 8 for 16 pin, 10 for 20 pin) and Vcc is the last pin (14 for 14 pin,
> > etc). Same for flash/EPROM/SRAM - pin 16 is ground, pin 32 is Vcc.
> >
> > Consult ICs datasheets to find power pins for other ICs. (I think
> > schematic omits power inputs in most cases)
> >
> > Thanks,
> > Sergey