View Full Version : Xerox 820-II Disks

March 10th, 2009, 06:14 PM
Well, I've received my Xerox 820-II (Thanks Erik!)

Now, after searching the Internet, I have yet to find any Disk images for it, in the 5.25" drive format. all the ones I have found are for 8" drives...

Does anyone out there have an 820-II with 5.25" drives? If so, would it be possible for you to make some Disk Images for me? I'd really appreciate it.

March 10th, 2009, 06:45 PM

Read that thread. Sure sounds like doing the same thing to me.

March 10th, 2009, 07:12 PM
Hmm, I've tried just writing the 8" images to 5.25", no luck there. I'm going to try the Xerox 820 (Not 820-II) images I've found next.

March 10th, 2009, 08:30 PM
I haven't tried any of that myself. Did seem to work in one case. Note: says was using 1.2MB disks.
I have a real 8" drive sitting here. I need to get around to working on getting those (dual drives) working.

March 11th, 2009, 05:40 PM
Can someone tell me about the cable that connects a Xerox 820-11 to a 5 1/4" drive? I understand that when connecting a disk drive to the 820 board pin 2 of J1 must be grounded for 5 1/4" drives. Pin 2 of J1 must be opened for 8" drives. That may be the problem...the disks you're making are ok, but you have not grounded pin 2.


I found the answer to my question. Using an SA 405 drive...and a 34-pin cable
The cable for the 5 1/4" drive is (according to notes I have):
1 n/c
2 GND if 5 1/4"
3 n/c
4 index
5 select 1
6 select 2
7 side select/select 3
8 head load
9 direction
10 step
11 write data
12 write gate
13 trk 0
14 write prot
15 read data
16 low current
17 ready
18 free +12
19 +5
20-37 GND

March 11th, 2009, 06:57 PM
Hmmm, Pin 2 of J1 on the floppy seems to be a ground, shouldn't be problems there. Not sure what to do. I'll keep looking I guess.

Interesting information on the cable though Billdeg. Any idea how to do the opposite, connect an 8" drive to an 820? That might be one of my future (once I get some 8" drives) projects.

March 12th, 2009, 04:07 AM
yes, simply open pin 2. It works like a toggle.

March 12th, 2009, 06:29 PM
I understand the pin 2 thing, I just don't know what the 8" drive cable looks like, except for the DB-37 on the one end.

Well, I've received some very good help, but I now have a different issue; A Cap in my 820's PSU just Blew up (a good show though, 2 loud cracks and tons of smoke). It's repairable and nothing else looks like it's harmed. But testing will resume after I've repaired it.