11 Feb
2018
11 Feb
'18
3:58 p.m.
From: Bill Degnan
What is the OS of the disks, what system was this disk
used to
create/save files to the RL02?
Doesn't really matter, does it, as long as the bits can all be read off the
pack into a file?
Once it's in a file, the appropriate OS, running in a simulator (and most
are, these days) can read the files out. Worst case, someone can write a
program to read the files out (I've done that for V6 filesystems - before I
found http://www.tuhs.org/Archive/Tools/Filesys/) and also 4.2 FFS. (And
somewhere I used to have a program to read DOS disks, but I just looked and
couldn't find it.)
Noel
11 Feb
11 Feb
4:10 p.m.
On 02/11/2018 03:58 PM, Noel Chiappa via cctalk wrote:
All it takes is a real system with ODT and vtserver.? Used to do it
all the time.? But I no longer have any real RL drives.
bill
From: Bill
Degnan
What is the OS of the disks, what system was this
disk used to
create/save files to the RL02?
Doesn't really matter, does it, as long as the bits can all be read off the
pack into a file?
Once it's in a file, the appropriate OS, running in a simulator (and most
are, these days) can read the files out. Worst case, someone can write a
program to read the files out (I've done that for V6 filesystems - before I
found http://www.tuhs.org/Archive/Tools/Filesys/) and also 4.2 FFS. (And
somewhere I used to have a program to read DOS disks, but I just looked and
couldn't find it.)
12 Feb
12 Feb
1:12 a.m.
On Sun, Feb 11, 2018 at 03:58:48PM -0500, Noel Chiappa via cctalk wrote:
Slight gotcha with RLs: the RT-11 DL(X).SYS driver maintains a bad-block
replacement list at the end of block 1, and uses it to remap the blocks while
it's reading. Hilarity ensues if you use RT to read a non-RT disk with
junk in that area (or even an RT one if it had bad blocks, since in the
copy, the data have been moved from the remapped blocks to the original
ones so you'd need to nuke the remapping table or RT will try to access
the wrong blocks in the future). So reading a non-RT RL01/02 (or RK06/07)
disk with .READ(x) isn't safe -- you have to use the .SPFUN call which
bypasses the mapping. I have a Kermit server which does this.
From: Bill
Degnan
What is the OS of the disks, what system was this
disk used to
create/save files to the RL02?
Doesn't really matter, does it, as long as the bits can all be read off the
pack into a file? (And
somewhere I used to have a program to read DOS disks, but I just looked and
couldn't find it.)
My PUTR.COM utility can do it, but needs MS-DOS, or an emulation. Yes I
should finish the portable C rewrite I started ... one of these years.
John Wilson
D Bit
2386
days inactive
2387
days old
2 comments
3 participants
participants (3)
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bill.gunshannon＠hotmail.com -
jnc＠mercury.lcs.mit.edu -
wilson＠dbit.com