Thread: Mk14 vdu
View Single Post
Old 7th Nov 2020, 12:23 pm   #825
Timbucus
Octode
 
Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,362
Default Re: Mk14 vdu

Something has changed in my setup now - I was trying to get readings from the SOC VDU on the address lines as it seems to me that A11 is barely driving above 2.4v - A8-A10 are the usual hovering around the 1.6v signal we see with strong drives to 4v. Anyway now both the SOC VDU and the OrtonView are not showing graphic mode by default - I wonder if the 8154 is failing - you can still use it to control the VDU's it just no longer defaults to the same settings of Graphics at Power on. I think it is also setting Black on White by default or enough to make the SOC think so as my TV clamps to black.

So bear this in mind when I report things moving forward the machine is not the machine it was last night...
Timbucus is offline