4 Aug
1999
4 Aug
'99
3:29 a.m.
Thanks All for the suggestions I've received so far.
To answer a few of the additional questions that cropped up:
I've had the drive for about 11 years. About 5 years ago it worked
correctly, so I'm assuming that internal switch settings are correct (though
I don't have a reference to verify them), and the controller/drive match.
I have a huge collection of disks, some marked RX01, some RX02, none will
boot. I am currently working with an RX02 disk that was used to boot
another PDP-11, then sent to me.
I checked that both drive belts are in place, and used a scope on the photo
transistor that detects the hole. The drive RPM was correct.
tony- This would help
>>There are some things you can try. Firstly (if
you have the programming
>>info - if not I'll find it), you can try transfering 256 bytes from the
>>PDP11 to the sector buffer and then transfering it back again (without
>>going via the disk). This will test most of the controller logic and the
>>sector buffer RAM. My guess is that this will fail.
>> -----Original Message-----
>> From: steve.lubbers(a)barco.com [mailto:steve.lubbers@barco.com]
>> Sent: Tuesday, August 03, 1999 8:51 AM
>> To: Discussion re-collecting of classic computers
>> Subject: RX02 Repair
>>
>>
>> I've been trying to bring my old RX02 drive back to life,
>> with little
>> success.
>>
>> I just received a good bootable floppy, and get the same
>> results as with all
>> my old disks, so now I'm looking for hardware problems.
>>
>> On a PDP-11/03, With RXV21 controller, and an RX02 drive, the RX02
>> initializes, attempts to read the boot block, and crashes
>> to ODT at 000600.
>>
>>
>> > In examining what my system reads as it attempts to boot,
>> it looks like I
>> > read every other 128 byte chunk correctly. I haven't
>> figured out a
>> pattern
>> > to the corrupt sections.
>>
>>
>> Does anyone have any RX02 diagnostics, or hardware trouble
>> shooting tips?
>>
>>
>> Steve
>>
>>