CMT 64Kb RAM module for HP-71b question

[mfleming]

(10-12-2021 08:00 AM)J-F Garnier Wrote:  

(10-11-2021 09:26 PM)mfleming Wrote:  However (wait for it) the table is not cleared by a RESETX command.

Yeah, I was suspecting that :-)

Code updated.

(10-12-2021 08:00 AM)J-F Garnier Wrote:  

(10-11-2021 09:26 PM)mfleming Wrote:  Is there another configuration pass following the FREE or CLAIM command?

Each FREE/CLAIM command is followed by a configuration.

Always something new to learn about the 71B!

(10-12-2021 08:00 AM)J-F Garnier Wrote:  

(10-11-2021 09:26 PM)mfleming Wrote:  Looks like a call to the initialize mapping table routine is needed for RESETX. Would it also be necessary to do the same with the UNCONFIG command? I've only seen that in the first configuration pass as some sort address decoding test.

UNCONFIG is used for RAM, after checking the RAM/IRAM status, to move it from 80000 to 40000.
It is normally not used for ROM and can be ignored by ROM emulators. But if one day you do a RAM emulator, you will need to manage the UNCONFIG.
See also these comments.

J-F

I'll make a note of that in the appropriate code block since that RAM possibility will eventually occur

The github repository will be updated in a few days with source changes and hex files for programming. The bootloader client is Windows only, so I'll see if I can write a simple python script to erase and replace the application code.

~Mark