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.
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