11 Mar
2016
11 Mar
'16
11:41 a.m.
Gary -- that must be what the other switch is for. I haven't yet unmounted the PS
board to see what the switch was connected to, only having recently gotten the schematic.
I'll make sure the switch is off (I think it may be on).
The schematic has an unlabeled jumper "J" which is shown connected. The related
transistor connects to the BEVENT signal on the backplane so that must be the LTC. Aha!
Rich
Sent from my iPhone
On Mar 11, 2016, at 2:22 PM, Gary L. Messick <Gary
at realtimecomp.com> wrote:
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