The MyDOS BASIC ramdisk patch:

   MyDOS 4.50 and above (4.5x) does not do BASIC with
a ramdisk.  It also does not do ramdisks larger than
256k (320k machine).  It also does not do unique
ramdisks like Mathy's XEGS 1 meg ramdisk.  Unless you
patch it that is.  Then it will do all the above,
including Newell 1 meg ramdisks.
   The problem lies in the ramdisk access routines.
It's odd that the 'autoconfigure' routine for the
ramdisk, located deep within the 'O' menu option of
MyDOS will correctly store the proper banking bytes
into the banking bytes tables, but then MyDOS will
mangle those bytes such that they don't work in BASIC,
as well as the other situations outlined above.
Here is the offending code which may vary somewhat
both in location and content depending on the exact
version you are dealing with:

LDA $D301	;0C0C AD 01 D3
ORA #$1C	;0C0F 09 1C
STA $31		;0C11 85 31
ORA #$1C	;0C13 09 1C
AND $0BBA,Y	;0C15 39 BA 0B
STA $D301	;0C18 8D 01 D3

   The offensive parts are the logic OR operations
and the AND operation as well.  To correct, substitute
NOP for the ORs and a LDA for the AND.  The patched
code looks like this:

LDA $D301	;0C0C AD 01 D3
NOP		;0C0F EA
NOP		;0C10 EA
STA $31		;0C11 85 31
NOP		;0C13 EA
NOP		;0C14 EA
LDA $0BBA,Y	;0C15 B9 BA 0B
STA $D301	;0C18 8D 01 D3

   Omnimon can change these bytes directly as can
BUG/65 or any of many such monitor programs.  You can
also use a sector editor to edit your MyDOS DOS.SYS
file, you just first have to find this string of
bytes:
AD 01 D3 09 1C 85 31 09 1C 39 BA 0B 8D 01 D3
         _____       _____    
   Keep in mind that the above underlined values
may be different than yours - no matter, just change
them anyway to these bytes:
AD 01 D3 EA EA 85 31 EA EA B9 BA 0B 8D 01 D3

   Then the most important part - write out DOS files
using the 'H' menu option.  For safety's sake, don't
write these to your only boot disk, but to a
temporary disk for testing.  If it works with no bugs,
then you can boot the test disk and write DOS files
to all your MyDOS disks.  You will have to hunt down
every disk you own with MyDOS DOS.SYS files on them
and overwrite those DOS files or you stand the 
chance that the non-patched version will creep back
into your system to wreak havok.  You've been warned.

   If you find the string at a different location, then
you have to apply some common sense to this patch in
order for it work out right for you.  The AND 0BBA,Y
instuction will have a different value than 0BBA.  You
must keep your current value while changing the AND to
a LDA.  That's simple, just change the preceeding 39
byte to B9.

   Remember that BASIC doesn't do drives above drive
number 4 and you are off and running with a MyDOS
ramdisk in BASIC.