USB Panda Display for klh10 help

[David Griffith]

I couple years ago I completed the design for my USB Panda Display[1] 
board.  This is a modernization of the original Panda Display once 
distributed by Spare Time Gizmos[2].  Both devices are intended to be 
connected to a more-or-less modern x86-class computer running the klh-10 
pdp10 emulator and provide useful blinkenlights.  The development of klh10 
is once again active, this time on Github[3].  I created my own repo of 
klh10 as a means of writing support for my new Panda Display.  The 
display seems to be recognized and used, but what it displays is 
meaningless.  I cannot fully test it until I can get the old test program 
compiled and working.  Once that's done, I'll add my changes to the 
PDP-10/klh10 repo and delete my own.

Here's a video of a computer with the old Panda Display running klh10: 
https://www.youtube.com/watch?v=g_LcQ5apODg.  The creator of that video, 
Jan de Rie, got the program that was used to generate that pattern from 
Mark Crispin, the creator of the Panda distribution of klh10.  That 
program appears at the end of this post.

I'm looking for someone who knows TOPS10 / TOPS20 well enough to figure 
out for me why this test program won't compile.  Once that's done, I can 
complete the firmware for the USB Panda Display an its support within 
klh10.  I'll then make more copies of the USB Panda Display board (and 
maybe overlays) for whoever wants them.


         TITLE HACK
         SEARCH MONSYM

HACK:   SKIPA 4,[^D4]
HACK0:   SOJL 4,TRAILL
         SETZB 1,3
HACK1:  TLNE 1,777777
          JRST HACK0
         MOVE 2,1
         CIRC 2,-^D18
         SKIPN 4
          SKIPA 1,3
           IOR 1,3
         LITES%
          HALT
         HRRZ 2,1
         MOVEI 1,30
         DISMS%
         MOVE 1,2
         AOJA 1,HACK1

TRAILL: SETZ 1,
TRALL0: LITES%
          HALT
         MOVE 2,1
         MOVEI 1,30
         DISMS%
         JUMPL 2,TRAILR
         LSHC 1,^D37
         AOJA 1,TRALL0

TRAILR: MOVSI 1,400000
TRALR0: LITES%
          HALT
         MOVE 2,1
         MOVEI 1,30
         DISMS%
         MOVE 1,2
         TRNE 1,1
          JRST HACK
         ASH 1,-1
         JRST TRALR0

         END HACK



[1] https://github.com/DavidGriffith/panda-display
[2] http://sparetimegizmos.com/Hardware/Panda.htm)
[3] https://github.com/PDP-10/klh10/

-- 
David Griffith
dave at 661.org

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