4 Jan
2021
4 Jan
'21
4:35 p.m.
On Jan 4, 2021, at 7:04 PM, Warner Losh via cctalk
<cctalk at classiccmp.org> wrote:
On Mon, Jan 4, 2021 at 3:40 PM Chris Zach via cctalk <cctalk at classiccmp.org>
wrote:
The Pro also has 16 sectors, that's a limitation of the sector address register. I
know the Pro format is different than the RQDXn format; the latter is larger presumably
because of more sectors per track. So that would fit.
paul
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
18 sectors seems odd. The Rainbow had a limit of 16 sectors, but that may
have been due to other reasons... It had a WD10xx controller.