11 Mar
2016
11 Mar
'16
11:22 a.m.
Rich,
If you need to disable the LTC interrupt, it's a jumper wire located on the top
(solder side) of the power supply. It originally came as two single pin socket type
things with a wire jumper-ed between them. When I previously asked whether it had two or
three switches on the front, later models moved it to the front panel.
Also, I vaguely remember issues with booting HT-11 with the LTC enabled. I believe you
could re-enabled it after booting, but that would be a ~40 year old memory!
Gary
________________________________________
From: cctalk [cctalk-bounces at classiccmp.org] on behalf of Richard Cini [rich.cini at
verizon.net]
Sent: Friday, March 11, 2016 1:35 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Which RT-11 for an 11/03
Mattis -- thanks! I'll check this out in detail when I get home tonight and I'll
give it a try.
Rich
Sent from my iPhone
On Mar 11, 2016, at 1:26 PM, Mattis Lind <mattislind at gmail.com> wrote:
SIMH has never directly supported mounting/attaching virtual TU58 devices.
Altho the required serial interface
is emulated (ie, a plain DL11 at 776500/300) the TU58 drive behind the
serial interface has never been emulated.
I just tested the latest SimH from
github and it is indeed possible to
enable tdc and attach an image file to the tdc0 device. I then booted into
RT11 from a DU-device and did INIT DD0: no problem.
Then I made a bootable DD image. I did even do a BOOT DD0: which gave me a
RT11-prompt. But booting from SimH failed on me. I am not sure why.
MattisMacBook:BIN mattis$ ./pdp11
PDP-11 simulator V4.0-0 Beta git commit id: 1b6f28a7
sim> set tdc enable
sim> attach tdc0 rt11-dd.dsk
TDC: creating new file
TDC: buffering file in memory
sim> attach rq0 rt11v53-games.dsk
sim> b rq0
RT-11SJ V05.03
.init dd0:
DD0:/Initialize; Are you sure? Y
.copy dd.sys dd0:
Files copied:
DK:DD.SYS to DD0:DD.SYS
**** Copying some files *****
.copy rt11sj.sys dd0:
Files copied:
DK:RT11SJ.SYS to DD0:RT11SJ.SYS
.copy/boot rt11sj.sys dd0:
.boot dd0:
RT-11SJ V05.03
.dir
DD .SYS 5P 20-Dec-85 TT .SYS 2P 20-Dec-85
SWAP .SYS 27P 20-Dec-85 STARTS.COM 1P 20-Dec-85
DIR .SAV 19P 20-Dec-85 DUP .SAV 47P 20-Dec-85
DU .SYS 8P 20-Dec-85 RT11SJ.SYS 79P 20-Dec-85
8 Files, 188 Blocks
316 Free blocks
.boot du0:
RT-11SJ V05.03
.
Simulation stopped, PC: 146414 (BCC 146446)
sim> exit
Goodbye
TDC: writing buffer to file
PDP-11 simulator V4.0-0 Beta git commit id: 1b6f28a7
sim> set tdc enable
sim> attach tdc0 rt11-dd.dsk
TDC: buffering file in memory
sim> b tdc0
Trap stack push abort, PC: 000000 (WAIT)
sim>
I have no idea why SimH is not able to boot from the simulated DD0: device.
The steps to make a bootable dd0: was exactly the same steps as to make a
bootable RK0: which works just fine.
Ersatz-11 on the other hand works fine with the same image:
E11>assign tt1: dda:
E11>mount dda0: rt11v53_dd.dsk
E11>b tt1:
RT-11SJ V05.03
.dir
TT .SYS 2P 20-Dec-85 DD .SYS 5P 20-Dec-85
RT11SJ.SYS 79P 20-Dec-85 SWAP .SYS 27P 20-Dec-85
STARTS.COM 1P 20-Dec-85 DIR .SAV 19P 20-Dec-85
RESORC.SAV 25P 20-Dec-85
7 Files, 158 Blocks
346 Free blocks
.
This is the image that boots in Ersatz-11 but not in SimH:
https://dl.dropboxusercontent.com/u/96935524/rt11v53_dd.dsk.gz
Since it boots on Ersatz-11 when set to 11/03 CPU it should work on the
real hardware.
BTW. It not so that the LTC interrupt is enabled in your system? I have had
problem with that one. In certain cases it need to be disabled. If I
remember correctly I had problems booting RT11 from MSCP devices with LTC
enabled.
/Mattis
> Don
>