That was my thought as well. I've gone over the ROM versions quite a bit and
the majority of the code is the same. Even comparing the RAM version to the ROM
version of the 200 shows that the bulk of the code is the same. But there is
the whole swapping in and out of the optrom that makes it difficult to do a
direct comparison.
Thanks for the insight. I'll keep chipping away of this. Hopefully someone can
find the originals but a disassembly may be the only way to make it happen.
Kurt
> The fact that the code was originally cross platform is also a point in your
> > favor. Maybe they use a subset of features of both ROMs
On Tuesday, March 15, 2016 10:14 AM, John R. Hogerhuis <[email protected]>
wrote:
On Tue, Mar 15, 2016 at 9:55 AM, Kurt McCullum <[email protected]> wrote:
As many of you know, I've been searching for the RAM versions of Sardine for
quite some time. Bob P. located the 200 version but the 100 and NEC versions
are still unaccounted for. Looking at Gary's 8201.net site brought me to the
BINCON utility. This aids in converting a model 100 CO file to one that will
run on an NEC. This is done by using a cross reference table to create a new CO
file with the proper machine language locations in ROM.
This got me thinking. Would it be possible to create a cross reference table
that would work in reverse. Say a 200 CO file to NEC or a 200 to 100? I realize
the there is far more to the conversion such as starting memory locations but I
wanted to float the idea out to see if it seems plausible. I believe the data
for such a table exists on Bitchin100.
I think an automatic utility is unlikely to work because computer science
(halting problem)
But a good recursive disassembler plus a mapping table of entry points is what
you need. I am not sure there is a one to one mapping though (some ROM code
exists on one platform on not the other, or the API / changed registers is
different, etc.) so in some cases custom code would still need to be written.
The fact that the code was originally cross platform is also a point in your
favor. Maybe they use a subset of features of both ROMs
-- John.
