Boot Loader Syntax

[Steve Gough]

I have a QBone working in an 11/23 cabinet with an 11/75 upgrade processor.

when i run the RT11 app from the Demo.sh with  a 22 bit aw switch i end up with a 

D>>>

prompt  

i am stuck here after setting the default device to rl1.

I am trying to follow the instructions which say (@10010G)

I just get invalid syntax.

What do i need to type to start the games demo at address 10010 ?

[Steve Gough]

I have tried to load boot code such as boot.ini and other shell scrips from the various app directories using the COMMAND

m ll <file name> 

These all fail with bus error at address zero. 

I have used the ./memory.sh code to use the memory on the QBone but I still get the same error.

How do you start an exec such as RT11 and be sure to use QBones on board memory?

[Jay Cotton]

Here is a command I use.

./211bsd... -aw 22

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[Steve Gough]

I have already run the scripts to start various execs including UNIX which I assume you refer to above.

I am then left with a “Hrizontal Sargent” prompt:-

>>>

Is this an error condition ?

[Joerg Hoppe]

Am 31.03.2025 um 18:54 schrieb Jay Cotton:

Here is a command I use.

./211bsd... -aw 22

On Mon, Mar 31, 2025 at 9:30 AM Steve Gough <stg...@hotmail.com> wrote:

I have tried to load boot code such as boot.ini and other shell scrips from the various app directories using the COMMAND

m ll <file name> 

These all fail with bus error at address zero. 

I have used the ./memory.sh code to use the memory on the QBone but I still get the same error.

How do you start an exec such as RT11 and be sure to use QBones on board memory?

Aren't the *.sh in /home/root not working? For example rt11v5.5_dl.cmd ?

The "menu" GUI (big word) should display in the header the memory status.
The top errors when operating Qbone/uniBone are:

- open GRANT chain (QBus backplanes are a challenge)
- physical controllers plugged into the backplane in collision with emulated ones.
- Operating system is not tailored to specific hardware (2.11BSD, RSX11 may need SYSGEN)
Try RT11 for starter.

kind regards,

Joerg

On Monday, March 31, 2025 at 12:18:19 PM UTC+1 Steve Gough wrote:

I have a QBone working in an 11/23 cabinet with an 11/75 upgrade processor.

when i run the RT11 app from the Demo.sh with  a 22 bit aw switch i end up with a 

D>>>

prompt  

i am stuck here after setting the default device to rl1.

I am trying to follow the instructions which say (@10010G)

I just get invalid syntax.

What do i need to type to start the games demo at address 10010 ?

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[Steve Gough]

Hello Joerg,

Thanks for the feedback.

When I run 

RT11v5.5_dl_shared.sh -aw 22

The only error I can see is after:-

ml dl.lst 

I get

Loaded MACRO-11 ……..

 No entry address at “start” label is 177777777777.

Write result_timeout @ 00000000

 Error writing QBUS memory.

This is the same error I get on all the various exec startup scripts.

Thanks

Steve

[Steve Gough]

Folks,

I have found a problem on the 11/73 CPU which probably explains the error (See photo).

After replacing the 11/73 with an 11/23 CPU:-

THE GOOD NEWS

The error disappears.

THE BAD NEWS

RT11 still does not start and I end up staring at the “Horizontal Sargent” >>> again.

Any ideas.

[Steve Gough]

Just tried the QBone in a working 11/53 AS A SANITY CHECK and it still will not run RT11.

I AM NOT SURE WHAT I AM DOING WRONG 😑 

[Joerg Hoppe]

Hi,

Thanks for the feedback.

When I run 

RT11v5.5_dl_shared.sh -aw 22

The only error I can see is after:-

ml dl.lst 

I get

Loaded MACRO-11 ……..

 No entry address at “start” label is 177777777777.

Write result_timeout @ 00000000

 Error writing QBUS memory.

This is the same error I get on all the various exec startup scripts.

I looked up the sources, the error comes from qunibus.cpp, line 546.
Reason: QBone tries to DEPOSIT via a DMA cycle, but it gets a bus timeout ("NXM").
This is strange as QBone probed available memory before with read/EXAM cycles.
So 000000 is readable, but not writable?

Can you reproduce these error with manual exam/deposit to 00000?

If you have a physical memory installed, please remove it, (and reorder cards to close the GRANT chain).
Then QBone is emulating all memory. If the error persists something *really* goes wrong.
Best remove all cards execpt CPU and QBone first ... but you did?

A full log of the PDP-11s console output as well as QBones console output could be helpful too.

kind regards,

Joerg

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