On 2013-04-02 18:45, 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.
I haven't looked, but I don't think that is the issue. The "old" ADVENT
for OS/8 had the text in all uppercase in the database. So, if you get
lowercase output you have a different database than the one I'm familiar
with.
Also, ADVENT runs under the FORTRAN IV runtime system, which does not
use any OS/8 device drivers, thus any options set in OS/8 are unlikely
to have any effect.
FRTS is like its own operating system. It runs with interrupts, and do
most I/O on its own. It also have a FPP8 emulator, since most all code
from FORTRAN IV is actually FPP8 code, and not PDP8 code. This also
means that things runs way faster if you actually have a FPP8 in your
machine.
Johnny
_______________________________________________
Simh mailing list
[email protected]
http://mailman.trailing-edge.com/mailman/listinfo/simh
