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APPENDIX
H.20
USE
~ith
MDOS
Several
versions
of
the
Floppy
Diskette
Cont~oller
Module
are available
for
use
~ith
MDOS.
I f
a crystal on the
controller board is used to generate timing
Tor
the
diskette
interfacel
this
section
is not applicable;
however,
if the
memorq clock from the EXORciser bus
is
being used to generate
the
~lmingl
the
follo~ing
precautions
must be taie,n
when
using MDOS and USE together.
Th e use r e I a c k
mu
s t
run
at
1 MH
z
.i
P 1 us
0
r
m i n.u s
a r e w
percent
(variable
clock
rate
acceptable
in
Series
I I
versions)1
to permit loading user memory with a program
from
a
file
from
the
di~kette.
If the user clock is not near 1
MHzJ
the
object
file
should
first
be
converted
to
an
EXbug-loadable
file
and copied to cassette or paper tape in
the regular
MOOS
environment.
Then,
the user
can
load
the
tape
via
EXbug in his own environment running with the user
c 1
oc
k.
The other precauti·on is the possibility
of
having a .
PIA
or
ACIA
in
the
user
memory· generate an
IRG
when
MDOS
is
initializing.
When memory resides at the same
addresses
in
both EXORciser and user system,
the EXORciser memory responds
when
such
a
redundant
location
is
readi
howeve~,
both
locations
respond
(one
in
each system) when the EXORciser
memory
is
~1'itten
to.
Thus,
if!
an
liD
device resides in
the
user's
system
at
an
address
that
is within the range
Or
contiguous memory
in
the EXORciser system,
the device will be
written
to
~hen
MDOS
sizes memory
at
initialization.
It is
possible,
the~erorel
to configure the
liD
device to
generate
a n
I R G.
MDOS
doe s not run
IJI
i
t h
I
RGs p en
din 9 .
T h
us,
a s
wit
c
h
should be installed to allow the
IRG
line to be opened.
This
has been done
in
the burfer
box
aT
USE2B.
FoT'
a
more
detailed
discussion
Or
USE
and the Floppy
Diskette ControlleT' Module one
OT'
more of the following three
manuals
should
be
consulted:
IIMEXUSE2B
User's
Guide
n
,
"Floppy
Disk
Contro-Iler Module User's Guide
n
,
or
the appendix
af the "USE User's Guide".
"
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