Rescue update: DEC RC-25s + / was Re: DEC cartridge ID

Johnny Billquist bqt at
Mon Jun 8 08:15:17 CDT 2015

On 2015-06-08 07:50, ben wrote:
> On 6/7/2015 11:08 PM, tony duell wrote:
>>> That should be trivial. I've never laid hands on an RC25, but there
>>> must be a microswitch that detects when a cartridge is installed, and
>>> is accessible for bodging...?
>> Yes, and don't do it!
>> In every fixed/removeable drive I have worked on (OK, never an RC25,
>> but...)
>> the heads for both the fixed and removeable disks are on the same
>> positioner
>> carriage. With the result that if you load the heads without a removeable
>> cartridge in place, those heads will touch each other, which is a good
>> way to ruin them.
>> -tony
> Is there no way to lock those heads in place?

"on the same positioner carriage".
Sure you can lock the heads in place. In which case the headers for the 
fixed disk are also locked in place.


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