Re: Troubleshoot CBM 3040/4040 drives

From: B. Degnan (
Date: 2008-08-03 17:44:03

At 05:21 PM 8/3/2008 +0200, you wrote:
>I have picked up a number of broken CBM 3040/4040 drives. They have
>various faults, and my hope was to be able to pull parts and assemble
>at least one, perhaps two working drives from them. Out of 6 drives, I
>have so far managed to find one working DOS board, one drive board and
>two mechanisms so I could put together one drive.
>In order to verify working parts, I start with plugging in the DOS
>board itself and read the error channel from a 8032 using PRINT DS$.
>Three of the remaining boards return a lot of garbage in an endless
>loop, while two boards do nothing.

What happens when you enter ?ds$ from the 8032 prompt?

What I do for drives that at least power up is boot a 4040 diagnostic disk 
on a good drive and then swap the cables to the bad drive and run the drive 
diagnostic loaded into memory.  At least I will get more info as to what's 

Do you have a 4040 diagnostic diskette?


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