OK, looks like IC33 (ALC244 buffer) is very dead. checked the inputs against the outputs for the first 2.5 seconds after power on. IC30 (next buffer along, bits 16-23) behaves normally, activity on outputs mirroring inputs. But on IC33, only activity on 2 inputs, nothing on outputs.
Looks like I can't do much until the replacement chips arrive.
What I don't understand is the inputs being flat (0v) - isn't that the main data bus ? How is the POST test working ?
Looks like I can't do much until the replacement chips arrive.
What I don't understand is the inputs being flat (0v) - isn't that the main data bus ? How is the POST test working ?
Statistics: Posted by cjed — Thu Jan 02, 2025 9:09 pm