Firing up the pdt11

Richard Pope mechanic_2 at
Sun Oct 11 19:17:27 CDT 2020

     I would like to get a clarification on this. Does either drive work 
fine in the PD0 position or does the drive that was not working in the 
PD1 position not work in the PD0 position? You said that the spare drive 
that you put in the PD1 position also does not work. I would try it in 
the PD0 position and see if it works or not. Would you please let me 
know on these items?
GOD Bless and Thanks,

On 10/11/2020 7:11 PM, Chris Zach via cctalk wrote:
> I'm back to working on the PDT11/150 again, the bottom floppy is 
> weird: It doesn't read rx01 disks, period. Top one is fine. So I tried 
> swapping all of the connectors on the control board so the top one was 
> PD1: and the bottom was PD0: Sure enough the top drive works fine as 
> PD1: and bottom is still dead so it's a drive issue.
> Pull the drive, put in a spare, button it up, and sure enough it still 
> doesn't work. Any ideas?
> Also I recall my MiniMinc/150 (which is in parts in my shed) had EIS 
> and FIS, but this one only reports FIS. Did DEC make pdp11/03 
> expansion chips that only had FIS?
> C

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