HP50g "Busy Bug"

[Simone Cerica]

in this discussion is explained the "busy bug":

50G "speed bumps" again
https://groups.google.com/d/topic/comp.s...discussion

John H Meyers

Quote:If the delayed keystroke registers when the *next* key is pressed,
then it's the "busy bug," as may previously have been mentioned;
I've seen no fix ever reported for that bug, which is highly likely
to reside in manufacturer Kinpo's ARM OS (the emulator and
hardware layer), rather than in the HP OS (which runs
on the emulator that hides within).

Joe Horn

Quote:You're experiencing the Busy Bug, which happens whenever a key is
pressed at exactly the same moment that the busy annunciator turns off.
The next system interrupt causes the delayed key to get executed.
Your observation of a 1-second delay reveals that you have the "Ticking
Clock Mode" turned on (flag -40 is set). Ticking Clock Mode causes a
system interrupt every second (even when HEADER < 2 which makes the
clock invisible), and THAT interrupt is what's causing your delayed
keystroke to get executed. If you turn the ticking clock off (-40 CF),
the delayed key will remain in the key buffer until the next keystroke.
Leaving the clock on is probably less annoying.

it's also instructive to read this topic:

50G - sporadic pauses - garbage collection ?
https://groups.google.com/forum/#!msg/co...KTrgY4zXIJ

You have to use FMEM by John H Meyers:

Code:

@ HP49/50 series only
\<< 5000. MAX :0:JUNK DUP PURGE MEM ROT -
IF DUP 0. > THEN MAKESTR SWAP STO
ELSE DROP2 END 0. DROP MEM \>> 'FMEM' STO

ex. 10000000 FMEM