5 Jan
2021
5 Jan
'21
9:32 a.m.
I used the Davids MFM emulator to emulate an RQDX2 formatted disk a few
years ago. I tested both with a RQDX1 and RQDX2. Both were tested with
10.0D firmware. I know that we had some initial problems which David fixed
quickly. As far as I remember I did read disks as well. But I have no
traces of these read disks since the flash of the Beaglebone got erased.
One thing to keep in mind with RQDX1 and RQDX2 is that they are not format
compatible among certain versions. Maybe the firmware that wrote the disk
is older and thus it cannot be read by the mfm emulator since it was
adapted to 10.0D?
/Mattis
Den m?n 4 jan. 2021 kl 23:40 skrev Chris Zach via cctalk <
cctalk at classiccmp.org>:
Can someone check to see if a RQDX2 used the Western
Digital chips to
interface to MFM drives? Reason I'm asking is the MFM emulator can
identify an RQDX3, and also a Pro/350 controller but this particular
RD52 I have (which was verified by me to run Digital Mumps) is reading as:
root at beaglebone:~/mfm# ./mfm_read -a
Board revision C detected
Found drive at select 3
Returning to track 0
Drive RPM 3525.4
Matches count 36 for controller WD_1006
Header CRC: Polynomial 0x1021 length 16 initial value 0xffff
Sector length 512
Data CRC: Polynomial 0x1021 length 16 initial value 0xffff
Interleave mismatch previous entry 0, 9 was 1 now 0
Selected head 8 found 0, last good head found 7
Read errors trying to determine sector numbering, results may be in error
Number of heads 8 number of sectors 18 first sector 0
Unable to determine interleave. Interleave value is not required
Drive supports buffered seeks (ST412)
Disk has recalibrated to track 0
Stopping end of disk search due to recalibration
Number of cylinders 512, 37.7 MB
Thanks!
CZ