Running a non-reformatted disk through Dave G's mfm device got me the
following after running a mfm_write to the whole disk followed by an
mfm_read:
Expected 312120 sectors got 311766 good sectors, 282 bad header, 72 bad data
0 sectors marked bad or spare
49 sectors corrected with ECC. Max bits
Wow, this is interesting Dave. Took one of the "formatted badly" disks
and did a write of your file.
root@beaglebone:~/mfm# ./mfm_write --emulation RD54_A -d3 -c1224 -h15 -s 17
Board revision C detected
Then a read of the disk:
root@beaglebone:~/mfm# ./mfm_read --analyze -e rd.dsk
Board revis
Yes, the no autoformat option allows me to specify RD54.
C
On 2/3/2023 12:14 PM, Nigel Johnson Ham via cctalk wrote:
On 2023-02-03 12:09, Chris Zach via cctalk wrote:
Decided to spend some time working on my 11/73 with MFM drives.
Currently it has one of my RQDX3 boards (I have 3, 1 in atti
On 2023-02-03 12:09, Chris Zach via cctalk wrote:
Decided to spend some time working on my 11/73 with MFM drives.
You don't have a MicoVAX 2000 sitting around?
Did you use the RD54 by any chance in a different system, and low level
formatted it there?
Well, formatting an RD53 seems to be working. And the rev 4 ROMs are
much nicer than the rev 3 in terms of talking to you.
Unit Cylinders Drive Name
0 1024 RD53
1 RX33 Diskette (FORMATABLE)
MSCP Controller Model: 19
Microcode Version: 4
Formatting of Drive 0
Wow, this is interesting Dave. Took one of the "formatted badly" disks
and did a write of your file.
root@beaglebone:~/mfm# ./mfm_write --emulation RD54_A -d3 -c1224 -h15 -s 17
Board revision C detected
Then a read of the disk:
root@beaglebone:~/mfm# ./mfm_read --analyze -e rd.dsk
Board revis
I do have an RD54 image that can be used with mfm_write. Search in page for RD54
http://www.pdp8online.com/mfm/status.shtml
Ok. Hm. So the command would be ./mfm_write --emulation RD54_A -d3?
This is possibly better than nothing: I could use this to put some sort
of format on the drive, then t
On Fri, Feb 03, 2023 at 12:09:27PM -0500, Chris Zach wrote:
>
> Question: Can Dave G's board be used to low level format an RD54? Can it
> test physical disk for errors (wasn't sure)
>
The read test you did should have told you if there were sectors with errors.
Using my tools to low level forma
On 2023-02-03 12:09, Chris Zach via cctalk wrote:
Decided to spend some time working on my 11/73 with MFM drives.
Currently it has one of my RQDX3 boards (I have 3, 1 in attic), a 40mb
ST412 drive (the half height Seagate whatever) which works fine. No
issues there.
I'm trying to format an RD
