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On Sat, 10 Jan 2009, David Wilson wrote:

> On Jan 10, 9:58=C2=A0pm, "Michael J. Mahon"
 wrote:
>> lyricalnanoha wrote:
>>> This contains a program I wrote to cram DOS 3.3 into 256 fewer bytes (b=
y
>>> disabling format and revectoring a couple patches) so that ProDOS need
>>> not be overwritten. =C2=A0It's a SYS file, and runs from ProDOS 8. =C2=
=A0(I also
>>> tested it under GS/OS 5.0.4) =C2=A0On the DOS 3.3 side of the disk is a=
 file
>>> RETURN TO PRODOS, which pokes in the MLI call for
"quit", then executes
>>> it - proving that ProDOS is still fully available.
>>
>> DOS 3.3 will run happily in just 16KB...
>
> I was thinking that DOS and ProDOS did not overlap (P8 in language
> card, DOS in 3rd quarter of RAM) but then I realized why lyricalnanoha
> needed to do this - the ProDOS global page at BFxx would be
> overwritten by a 48KB DOS (and who would want to run a 16 or 32KB DOS
> on a machine with 48+KB?).
>
> Well done lyricalnanoha. I will have to try it out sometime.
>

That's exactly it.  I just crammed the stuff that would load into the=20
ProDOS global page down into the BEAF-BEFF area, overwriting the format=20
code.

I did a further tweak later that uses the image from dos.system *before*=20
the jmp $9d84, instead of *after* as the first version, I want to primp it=
=20
up a bit before I release that as the second edition, mainly I want to be=
=20
able to format from both sides (for ProDOS I got HyperFormat).

Naturally I used Hybrid Create :P

-uso.
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