I’ve tried every disk in every drive with what I thought was the working configuration, to no avail. Every failure is the same: hitting ‘b’ to boot, getting ~5 seconds of disk activity, and failing with ‘? Boot Error’. Heads appear to be in impeccable condition, and the disks look clean. Here’s a closeup of the heads on the hard sector drive:
And here’s the collection of disks I’m working with:
SW501,4 controls which card to boot from:
0 = H88-1 Card at P506/P512 (the right most slot), I/O Port 174
1 = Z89-37 Card at P504/P510 (the left slot of the right bank, I/O Port 170
I’ve tried both; 0 boots to the internal, hard sector disk, 1 boots to the 1st drive in the H-37 enclosure, a 96tpi soft sector drive.
Yes, it’s backwards. My predecessor was nice enough to not cut the links, but to simply bend the pins of the package out. unfortunately, they’re super fragile, and a single attempted bend broke the pin, several times. I ended up using a portion of the original package and some wire.
Note that J4-J7 needs to be set correctly on the Z89-37 card. It’s now set to J4, meaning the single drive ID’s as DS1 plugged into P3 (the top port on the card) is Drive 0.
I temporarily crammed it back in, and got to the H: prompt. Still won’t boot to a disk.
I wonder if this is noteworthy:
Every boot attempt seemed to take the same amount of time to fail (3-4 seconds), regardless of which configuration or even if a disk was present. When I jump J4 on the Z89-37 (what I believe to be the correct config), an attempted boot without a disk tries indefinitely and never fails.