Anybody got any info about this? I can't find any evidence that any of the Master MOS versions I've got issue this service call, nor do the Compact ARABIAN-C or International ROMs try to handle it. (The International ROM does handle service call &30 - translate Internationalised keyboard keypress.)&31 Keyboard driver call.
--Tom
P.S. while doing a quick first draft disassembly, just to check which service calls were being handled, I did notice that the ARABIAN-C ROM calls directly into MOS 5.11i! It does a jsr $e94e in several places, bypassing WRCHV to go to OSWRCH directly. A bit rude when there's a perfectly serviceable NVWRCH entry point at $ffcb already...