RX02 Difficulties

Aaron Jackson aaron at aaronsplace.co.uk
Fri Dec 8 17:17:56 CST 2017

>> On Dec 8, 2017, at 12:53 PM, Aaron Jackson via cctalk <cctalk at classiccmp.org> wrote:
>>> On Fri, Dec 8, 2017 at 3:03 PM, Aaron Jackson <aaron at aaronsplace.co.uk> wrote:
>>>> Manual says it should be S1=off, S2=on for RX211 and RXV21
>>> In the photo, I think S1 is on and S2 is off. Check them with an
>>> ohmmeter if in doubt!
>>> -tony
>> Yes - you are right. I switched them back to how they were when I got
>> the drive. I think one of the switches was half down because XXDP
>> actually does something now.
>> Most of the tests now look something like this:
>> CZRXFB0 DVC FTL ERR  00034 ON UNIT 00 TST 031 SUB 000 PC: 003476
>>       EXPECTED SECTOR=18.
>>         TARGET SECTOR=17.
>> I suppose these should match?
>> Starting to think I might need to confuse myself with my logic analyzer
>> and the RX02 control board.
>> Thanks,
>> Aaron.
> To isolate the problem further, try to see if any of the errors follow
> the media  as you move them between drives.  
> If the same errors occur on both drives, regardless of media then the
> RX02 system board or perhaps the Qbus controller are at fault.  
> The field maintenance prints should allow you to trace the fault down
> a bit further,  with or w/o a logic analyzer.
> How many different types of errors do you see?
> Jerry

Thanks for the info Jerry.

I get read errors, data errors, density errors, sector addressing
errors. Probably every kind of error xxdp can give :)

Please see this link if you are interested:


I will take a proper look through the field manuals tomorrow, and also
try what you suggested with trying the same media in both drives.


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