17 Feb
2019
17 Feb
'19
10:57 a.m.
Has anyone been successful in dumping the EPROM contents from an MC68701?
As I understand it, this MCU requires executing a particular program from
external memory to access the internal EPROM, both for programming and
reading.
I will write a utility to dump the contents if necessary, but I am happy to
refrain from reinventing the wheel if a solution already exists.
Thanks!
Kyle
17 Feb
17 Feb
11:26 a.m.
it depends on the version of 68701
P3 has no protection P5 does
a P3 can be read with a Data I/O Unisite
http://matthieu.benoit.free.fr/pdf/MC68705P5_Bootstrap_ROM_Listing.pdf
The P5 is more involved. You put it into factory test mode, feed it a NOP instruction
and it will output the rom data on the I/O pins.
A variation of that will work on other parts in the series.
On 2/17/19 7:57 AM, Kyle Owen via cctalk wrote:
Has anyone been successful in dumping the EPROM
contents from an MC68701?
As I understand it, this MCU requires executing a particular program from
external memory to access the internal EPROM, both for programming and
reading.
7:11 p.m.
On Sun, Feb 17, 2019, 15:52 Al Kossow via cctalk <cctalk at classiccmp.org
wrote:
it depends on the version of 68701
P3 has no protection P5 does
a P3 can be read with a Data I/O Unisite
http://matthieu.benoit.free.fr/pdf/MC68705P5_Bootstrap_ROM_Listing.pdf
The P5 is more involved. You put it into factory test mode, feed it a NOP
instruction
and it will output the rom data on the I/O pins.
A variation of that will work on other parts in the series.
Thanks for the info! Pardon the na?ve question, but will this procedure
work for the 701? Not sure the differences between in and the 705.
Kyle
2056
days inactive
2057
days old
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aek＠bitsavers.org -
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