Apple II

I was wrong when I connected my disk II to the controller board

row 2-4-6...20 was connected on row 1-3-5...19

any idea of way may have burn ?

the 74LS125 is dead, exploded, I changed it

then engine is turning, and I hear a bump, so I guess the stepper is working

connection realized with my error
gnd 1 2 stepper 0 ok
gnd 3 4 stepper 1 ok
gnd 5 6 stepper 2 ok
gnd 7 8 stepper 3 ok
-12 9 10 wrreq burnt ?
+5 11 12 +5 ok
+12 13 14 drven burnt ?
+12 15 16 rddata burnt ?
+12 17 18 wrdata burnt ?
+12 19 20 wrprot burnt ?

any idea of the conponent that burnt in this case ?

thanks

So I got that Rev 7 board with all the missing sockets and am about to attempt to restore it. I am wondering if anyone knows of a source for correct sockets.. or if I should just make do with the generic new ic sockets I have kicking around?

I have a Disk II, after a lot of cleaning, I have a disk II reading/writing the floppy disk

but I have some read error on track 34, it's not a bad floppy disk (the problem occurs on almost
all my disks)

I've adjusted the speed, it was a bit slow

but know I have no idea,
occasionally it works and read the entire disk...

but most often it fails on the last track

any idea of what I should to to solve this problem ?

thanks

I never plan to use my machines to print stuff, and it seems the parallel cards have very little monetary value, so I was wondering if there are any cool things you can do with them?

If not, I'll just remove it and wish it was a serial card instead