Thread: Mk14 vdu
View Single Post
Old 30th Oct 2020, 4:32 pm   #710
Mark1960
Octode
 
Join Date: Mar 2020
Location: Kitchener, Ontario, Canada
Posts: 1,264
Default Re: Mk14 vdu

Quote:
Originally Posted by SiriusHardware View Post
The CE1 of the 0Fxx range has three distinct levels. I don't like that at all.
Is this chip enable direct from the address bus? The A0 in previous posts shows similar levels. As the RAM chips have two chip enables this might not be a problem if the other chip enable is high at those times but its also never good to have indeterminate signal levels. Maybe adding pullups to the most significant address lines would help.
Mark1960 is online now