[Simh] PDP8, Adventure, and SIMH

[Rob Doyle]

On 4/2/2013 9:45 AM, Rick Murphy wrote:
> At 02:12 PM 3/29/2013, Rob Doyle wrote:
>
>> I just noticed that my PDP8 FPGA implementation differs from SIMH
>> when dealing with mixed/lower case text.
>>
>> I also checked the operation on David Gesswein's online PDP8 and the
>> operation of a real PDP8 matches the operation of my PDP8 FPGA and
>> differs from SIMH.
>>
>> I did use exactly the same RK05 disk image for both SIMH and the PDP8
>> FPGA. The image for the real PDP8 /could/ be different.
>>
>> I'm guessing that SIMH intentionally forces upper case because I didn't
>> do anything special to the PDP8 FPGA. I didn't see any SIMH
>> configuration options to change this.
>>
>> Is this intentional?
>
> The option you're looking for is
> set tto 7b
>
> That will stop the case folding.
>          -Rick

That was the issue.

I couldn't believe that I had some weird FPGA mistake that could create 
mixed case from upper case.   All is well with the world... again.

Thanks.

Rob.