8 Sep
2010
8 Sep
'10
1:40 p.m.
> I recently obtained a Microwriter with an LCD
display.
>
> Else it may be faulty
> I found Tony's post from 2009 asking for a 'good' EPROM image maybe
> mine is failing in a similar way.
Tony wrote:
FWIW, I am still stuck... I am pretty sure the
Firmware EPROM in mine is
corrupted, some 'chords' do not produce the characters I would expect
My one can generate all the letters, numbers and punctuation marks so fingers crossed the
EPROM is OK.
IIRC, the EPROM is a 25C64 (which is slightly
different to the more common
27C64). If you have a programmer capable of reading out that device, it
would be interesting to compare the ROM in mine with it.
OK, I'll try and read the EPROM. This might take me some time, but I am keen to
do it as there is very little technical stuff about the MW4 on line.
I might try and disassemble the code too (but I don't think IDA has a 1802 option!)
Regards,
John