Bug in v41 and 41X emulation ?

[Ángel Martin]

Your observations are spot-on J-F, indeed it's not likely to be attributable to a different behavior of the display drivers between FN and HN machines,

You're also right the code had a wrong jump distance, and after correcting it it now runs flawlessly in all platforms. Finally the scrolling message on V41, 41X, etc...

It's still quite curious and suspicious that on the CL the execution was always uneventful even with the wrong jump distance in the code. That can only mean that there's something unique in way the CL emulates the display, something that made it more resilient to this problem. It could well be a coincidence but I'll try to do some further testing to identify the exact point of divergence..

Thanks much for researching this issue.