In the last post I had found a faulty RAM chip on the disk controller board and ordered a replacement from a supplier on ebay.<\/p>\n
Well, the part arrived Today and one fitting, the error lights on the disk controller went out… For a while.<\/p>\n
I can confidently say that we are past the RAM errors and it is trying to boot but the drive makes a lot of stepping type noises and doesn’t settle down for quite a while. Then the some LEDs on the main board and the controller board light up.<\/p>\n
This is what we have this time.<\/p>\n
This time, according to the manual, they don’t mean RAM error. This time they mean.<\/p>\n
1, 4&5 on the main board.<\/p>\n
This manual says that this “Verifies that the second pass of the disk drive diagnostic was successfully completed. If an error is indicated, refer to Table 5-4 for the possible fault indicators on the Disk Controller module test phase 2.”<\/strong><\/p>\n 1 on the disk controller.<\/p>\n The manual says “Verifies the position of the disk drive 0 head after a restore command is issued.”<\/strong> and the course of action is “Replace defective drive 0 or module.”<\/strong>.<\/p>\n Replacement isn’t an option so I’m going to have to go in and see what’s occurring.<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" In the last post I had found a faulty RAM chip on the disk controller board and ordered a replacement from a supplier on ebay. Well, the part arrived Today and one fitting, the error lights on the disk controller went out… For a while. I can confidently say that we are past the RAM … Continue reading DEC PDT-11\/150 \u2013 Part 5. The new disk controller RAM arrived.<\/span>