RE: [Rcxemul-discussion] Update on serial comms

[David E. <d.a...@du...>]

Another quick update on serial comms.

I did a quick hack that allowed me to turn verbose debug information on
while the emulator was running, and dumped the final few instructions
after the firmware download to a file.

The message that the download program sends to unlock the firmware is
accepted, and the unlock firmware opcode is executed. It detects the
string that identifies the firmware as valid. However, the checksum
calculated during the unlocking process differs from the one calculated
during download. It expects to see 0xCA4A but actually sees 0xCA3E. I
don't know which of these is valid. It will probably require a bit of
experimentation.