USB Panda Display for klh10 help

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 A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?