27 Feb
2011
27 Feb
'11
7:39 p.m.
Has anyone ever tried using the tu58em program to boot a VMS 5.2 install standalone backup
on an 11/750 ?
I ask because I am attempting to do so, and I keep encountering mount verify errors when I
get to the fourth tape in the set. I see a lot of web references to using tu58em in the
PDP-11 world, but not so much on the VAX. I suspect some sort of protocol error caused by
an invalid response from the emulator. Same problem with the VMS 5.3 install, by the way.
Before I pursue this approach to installing the OS any further I thought I'd see
whether there's a known issue trying to do this.
-Dave
1 Mar
1 Mar
9:09 p.m.
David Comley wrote:
Has anyone ever tried using the tu58em program to boot
a VMS 5.2 install standalone backup on an 11/750 ?
I ask because I am attempting to do so, and I keep encountering mount verify errors when
I get to the fourth tape in the set. I see a lot of web references to using tu58em in the
PDP-11 world, but not so much on the VAX. I suspect some sort of protocol error caused by
an invalid response from the emulator. Same problem with the VMS 5.3 install, by the way.
Before I pursue this approach to installing the OS any further I thought I'd see
whether there's a known issue trying to do this.
-Dave
If you are referring to the emulator at
http://www.ak6dn.com/PDP-11/TU58 then it is possible you are running
into the RSP/MRSP protocol issue.
I have only used the emulator with PDP-11s (PDP-11/44 and PDP-11/34
w/DL11W) which only use the original RSP (ie, no handshaking) mode. My
understanding is that later on DEC implemented MRSP (Modified RSP) mode
with implemented a byte-level handshake to be able to deal with the
slower serial thruput on the 11/730 and 11/750 VAXes.
The above emulator makes an attempt to support this mode (using the -m
switch on launch) but it is completely untested as I have no way to do so.
You might also might try using the -t or -T switches to slow the
emulation down to more like a real TU-58 drive. I had to add the -t mode
to allow the emulator to pass the DEC TU58 exerciser diagnostic as a
full-speed emulation without extra delays failed many tests that relied
on specific TU58 timing behavior.
Don
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