hidden directory - hp 28s

[Raymond Del Tondo]

(06-07-2015 11:49 PM)Mark Hardman Wrote:  

(06-07-2015 10:04 PM)Dave Britten Wrote:  Yeah, it would be pretty neat. The keyboard layout would provide a challenge, of course. Use an overlay, or try to map functions to their locations on the 48, sacrificing key code compatibility? Maybe an option to use either approach?

If you are willing to part with 100 EUR, HrastProgrammer already has what you're looking for (and much more).

His great emulators are in a class of their own.
However a hardware emulation was not my intention. At least the 41X emulators are applications which always run, there can't be an idle mode (except for NUT CPU sleep mode) since everything, incl. interrupts and timers has to be emulated . The 42X emulation can make use of the HP 48 hardware, so it can use the hardware timers. But it's still 128K + RAM chunks , where 64K are for the ROM image alone.

My intention was/is making a UI simulation, which will be an HP 48 system compliant application, incl. FOCAL execution engine. One goal is to keep the application total size less than 64K.