HP-15C CE woes: 1 bug, 2 limitations, 3 questions

[ThomasF]

(08-09-2023 07:13 PM)brouhaha Wrote:  In the 16C microcode, the f SHOW <base> microcode at ROM address 0f49 calls a subroutine at 00b6 that is supposed to wait for key release. This subroutine is also used for f MEM, f STATUS, SST, and BST. Do those functions continue showing their display as long as the key is held?

Hi Eric,

f MEM and f STATUS works as the mode, ie in the original 16C shows status as long as the key is pressed, but on the CE only for some seconds.
But SST is even worse, on the original the line number and keycode is shown while the key is pressed, but on the CE nothing is shown. The instruction is executed and the display is updated directly when the key is pressed, no line number or keycode is shown at all ...
Same with BST (except nothing is executed), ie nothing happens in the display (but the PC is decremented (verified by entering PRGM mode)).

Cheers,
Thomas