Which RT-11 for an 11/03

[Don North]

Whoops slight correction .. . the TU58 protocol supports a 16b block number, so 
it is 65536 blocks of 512B, or 32MB maximum.

On 3/12/2016 3:55 PM, Don North wrote:
> Well looks like I have been living in the past ...
>
> I have been using v3.9 SIMH from the SIMH website (the 'legacy' version) and 
> have now gone an upgraded to the github v4.0 version. This one it appears has 
> supported the serial virtual TU58 device since mid 2015 (at least by comment 
> dates).
>
> I have tried it, and it successfully boots my XXDP TU58 images, as one should 
> expect.
>
> However, I tried mounting a larger than 256KB physical TU58 image on the 
> virtual TU58 (as one can do with a real TU58) but it does not appear to work 
> as I expect. I should be able to mount a 10MB RL02 XXDP image on a TU58 and 
> then do read-only accesses to the full image. The real TU58 protocol supports 
> up to 32MB devices (512 blocks of 512 bytes) but it seems that the SIMH TU58 
> only supports a physical TU58 tape image of 256KB. I'll have to do some more 
> experiments and read some code to see what is going on.
>
> If this restriction is in place it does rather significantly limit the utility 
> of the TU58 virtual serial device, in not allowing one to build an (up to) 
> 32MB disk image under SIMH, and then move it to a real TU58. Limiting simh to 
> only 256KB sized images is being true to the physical limitation of TU58 
> cartridges, but not true to the actual capability of the TU58 serial line 
> protocol.
>
> Don
>
> On 3/11/2016 11:19 AM, Richard Cini wrote:
>> I had a little time after lunch to try the below procedure and using the beta 
>> version of SIMH I am able to create a tape image that's bootable by SIMH 
>> without the below error.
>>
>> I copied the following to the image, which I will try with TU58em when I get 
>> home tonight:
>>
>> DD, TT, rt11sj, DU, SL, LD, pip, dir, swap, dup, and starts.com.
>>
>> The size of the image is 504 blocks (264 free).
>>
>> 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
>>>>
>
>