MEMOTEXT takes over control of the ZX81 after startup until power off:
andmemotech wrote: STARTING UP
When you first plug in MEMOTEXT and switch
on the power to your computer, the first
prompt will ask you if you are using the
Centronics or the RS232 Interface. In common
with all prompts where you are asted to make
a simple choice between alternatives, you
should reply by typing the first letter of
the alternative you require. If you are
operating with a Centronics Interface you
should reply "C", and with our RS232
Interface you should reply "R".
So I don't think, that it is possible to read/copy the memotext rom while connected to a ZX81. I think, the only solution is to read the roms in an eprom burner, store its content in a file and try to disassemble the code to find out, at which address the code expects to be run.Arrive at work; switch on MEMOTEXT; load a file of normal letters; load a
data file containing names & addresses of clients.
From time to time during the day go to MEMOTEXT; tell it which standard
letter you want; if it is for an existing client scan through the data file
for his details; if it is for a new client select the I option for data file
printing and be prompted for the information needed by the standard letter.
At the end of the day switch off MEMOTEXT and go home.
If that is possible, the rom content (and the original ZX81 rom content in the gaps between the memotext roms) could be "loaded" to flash "rom" (at the same address) of a ZxMore instance >= 1
If the code there could be run starting at address 0 (Karl?), this instance maybe will behave like a ZX81 with memotext rom installed