The bad segments are: BF-B0, 9F-90, 3F-30 and 1F-10.

These are the SRAMs on the EXDOS card. But this is summary 1024K not a 512K!

Use :LRAM command, and see what is missing from the list.

Anyway if you start the testing with STOP key then will halt at when bad segment found.

Ok, with :LRAM the only missing segment is 10. But I thing is the segment in use.

Yes the lowest segment are the Page Zero segment.

Do you used the LRAM after when the test found bad segments?

STOP test doesn't find any bad segment.

Do you combined with others? For example with the normal?

I know I made a mistake on something but I find no fault in the modifications.

Invariably it hangs after the :LRAM test.

You are right,  "rápidamente"gives better informatión, but "rápido is perfectly correct, like saying in English "fast passing" intead of "fastly passing".
------------------
Tienes razón, "rápidamente" da mas información, pero "rápido" es perfectamente correcto, tal como decir en Ingles "fast passing" en vez de  "fastly passing".

I've been thinking that some signal has been left connected when I taken advantage of the card tracks to do the bridges...

I'll try what you suggest, but I think at the end I'll do everything aerial.
-------------
He estado pensando que alguna señal se ha quedado conectada cuando he aprovechado las pistas de la placa para hacer los puentes....

Voy a probar lo que me dices, pero creo que al final voy a hacerlo todo aéreo.

I've remade all the modifications and still the EXDOS memory access acts erratically, not the 1M DRAM. Why?.

Can be another problem not related with the last manipulations?

Prior to them my Microteam card worked fine...

The same, random errors accessing those three new chips, but the  old dram of the card working perfect. I'm thinking seriously to send you it to fix...