8 Sep
2010
8 Sep
'10
4:40 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
9 Sep
9 Sep
8:04 a.m.
On 08/09/10 21:40, John S wrote:
I might try and disassemble the code too (but I
don't think IDA has a 1802 option!)
I'm pretty sure it does -- it certainly has 6502 and Z80. You might need
the "Advanced" licence to get the additional CPU modules, though.
If not, you could always try DASMx --
<http://myweb.tiscali.co.uk/pclare/DASMx/>
--
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/
12:28 p.m.
On 9 Sep 2010 at 13:04, Philip Pemberton wrote:
I'm pretty sure it does -- it certainly has 6502
and Z80. You might
need the "Advanced" licence to get the additional CPU modules, though.
Nope--here's the list:
http://www.hex-rays.com/idapro/idaproc.htm
But the 1802 is so simple, writing a disassembler shouln't take more
than an afternoon. IDA also has a processor SDK available for the
"roll your own" crowd.
--Chuck
2:10 p.m.
> I recently obtained a Microwriter with an LCD
display.=20
>=20
> Else it may be faulty
> I found Tony's post from 2009 asking for a 'good' EPROM image maybe=20
> mine is failing in a similar way.
Tony wrote:
FWIW=2C I am still stuck... I am pretty sure the
Firmware EPROM in mine i=
s=20
corrupted=2C some 'chords' do not produce
the characters I would expect=20
My one can generate all the letters=2C numbers and punctuation marks so fin=
gers crossed the EPROM is OK.
OK=2C I'll try and read the EPROM. This might take me some time=2C but I am=
keen to=20
Certainly no hurry this end. I have (literally) hundreds of projects to
be going on with...
do it as there is very little technical stuff about
the MW4 on line.
I can supply a reverse-engineered schematic of the MW4 if you want it.
Alas I don't ahve scanner, so I would have to send you it on paper..
I might try and disassemble the code too (but I don't think IDA has a 1802 =
option!)
I have the 1820 instruction set description, etc, if you need that.
Writing a simple disassembler (i.e. one that doesn't try to make any
sense of the code it's disassembling) is a fairly easy task, even I can
manage it, and I'm no programmer.
-tony
5031
days inactive
5032
days old
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ard＠p850ug1.demon.co.uk -
cclist＠sydex.com -
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john_a_s2004＠hotmail.com