Sage II - Special Monitor Commands

SAGE Ir
SERVTCE
MANUAL
[1.0]
POWER-UP ROUTINE
DISK BOOTSTRAP
(cont)
Usually,
lf a
floppy
dlsk
error occurs,
one
of these
error
messages w111
be
gl-ven:
ttDrlve
error
(code)
on
drlve
(O
or
l)tt
where codes
are:
01
controller
fallure
02
lnvalld command
03
recallbrate or seek
fallure
04
t
imeout
05
-
nlsslng
address mark
05
-
no
data
found
07
overrun
08
CRC
error
09
end-of-cylinder
0A
unknown
0B
address
out-of-range
VI I. 04 SPECIAL
}iONITOR COI{UANDS
:
T'here are several monltor cornmands
spectf
lcally
designed
f
or
hardware
trouble shootLng.
ERx and EFx
These commands cause
4K
of data
to be
transfered
fron/to
the
spectfled
drlve and
block
number.A
perlod
('.'
)
ls
dlsplayed
for
each
successful
transfer whlle an
'X'
ls
displayed
for
each unsuccessful
transfer.
A11 errors are
lgnored
by
the
system. Signals
to the Floppy
drlve
or
controller can be vlewed wlth
an
oscllloscope
to deEermlne the
problem,
By
startlng the
read
on
a block
lt
that
ls a
multlple of
4,
the
side
select
llne
can be observed
to toggle.
ERO
bbbb
Block
bbbb
(hex)
on
Unit ll4
(left
floppy)
ls
continuously
read.
ERI bbbb Block
bbbb
(hex)
on
Unlt ll5
(rtght
floppy)
ls
contlnuously
read.
BIIO
bbbb
Block
bbbb
(hex)
on Unit
lt4
(left
floppy)
ls
contlnuously
written to wlth
all zeros.
Remember
to
use
a
scratch dlskette.
EIrl
bbbb Block bbbb
(hex)
on
Unit ll5
(right
floppy)
ls
continuously
wrltten to wlth all
zeros.
Remember
to use a scratch dlskette.
13