Ron H said:
Has anyone noticed the diode in the WR* line to the ADC? This is not a good idea for CMOS.
I thought the diode was placed there to give a further voltage drop across the line so as to avoid false triggering. The diode to the transistor is to drop the 1.4 VLow from the parallel port to 0.7v also from the same purpose I specified above.
:lol: that was a funny one JimB, with oscilloscopes going into Mhz this could certainly do for an experimental module.