[HECnet] Task Buillder question

[Johnny Billquist]

Yeah. That is usually a good idea. Debugging on the front panel was 
never that much fun. :-)

And I think RT-11 is much more straight forward for such development 
than RSX. Obvious, considering that RT-11 LINK is able to produce 
absolute loader output, which TKB can't.

   Johnny

On 2021-04-12 22:47, Steve Davidson wrote:
> Part 2
> 
> I wrote conditional macros to allow me to run the “OS” under RT-11 as an application. This was the fastest way to debug logic errors. It didn’t do much for the hardware interfaces but it was better than debugging on the actual HW platform.
> 
> -Steve Davidson
> 
> SF:iP1
> 
>> On Apr 12, 2021, at 16:43, Steve Davidson <steve at davidson.net> wrote:
>>
>> When I was a DEC OEM we used RT-11 and LDA format to load our custom “OS”.  It was my first real project as a system developer. Made good money in those days... 😊
>>
>> -Steve Davidson
>>
>> SF:iP1
>>
>>> On Apr 12, 2021, at 16:17, Paul Koning <paulkoning at comcast.net> wrote:
>>>
>>> 
>>>
>>>>> On Apr 12, 2021, at 4:09 PM, Johnny Billquist <bqt at softjar.se> wrote:
>>>>
>>>> Right.
>>>> When someone talks about the paper tape system, and absolute loader format, it is without any operating system underneath. It's just bare metal. And the absolute loader is just a simple format that can be read by a small program that you have in memory. It's only purpose is to read in a paper tape with the binary on it, and start that.
>>>>
>>>> So there are no system dependecies, there are no addressing issues. It's just actual bytes that will be written to specific addresses in memory, and then a jump to an address, and off it goes.
>>>>
>>>> Johnny
>>>
>>> BTW, SimH can load abs loader format files directly (with the "load" command).  So you don't even need to feed it the abs loader to execute such programs.
>>>
>>>    paul
>>>
>>>

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol