Another stupid flashing cable question HP-30b / HP-15C CE

[AnnoyedOne]

Max,

I haven't given up--yet

The HP-20B "development kit"

https://www.hpcalc.org/other/pc/hp20b_de...nt_kit.zip

contains

"HP20b original ROM.bin"

which is 128KB in size (not 112KB--that is it includes the bootloader).

Have you tried flashing that to get your 20B's functional again?

A1

PS: The package also includes a PC version of the example HP20b application. Being a MFC (Microsoft Foundation Class) program it'll run in Windows 2000 and later.

PPS: I found and downloaded the Atmel AT91SAM7L128 datasheet (PDF) and the bootloader is in ROM (12KB) so it cannot be erased. The flash is 128KB.