MANUAL OPERATION
LIST and VERIFY modes are not affected by the multi-pass programming requirement.
In
LIST, data is
listed direct from the
COpy
ROM.
In
VERIFY the COPY ROM is verified against the MASTER
ROM
or
other input device data.
PROGRAM and DUPLICATE operate as described in the operating procedure except that data from
the
Input device (Keyboard, MASTER s-ocket, Paper Tape, TTY) is collected in a RAM memory until the LAST
ADDRESS
condition
occurs. When the LAST ADDRESS is detected the Series
90
begins the required
multi-pass programming sequence, transferring data from the RAM
to
the
2708/04.
As the programming operation proceeds in either the PROGRAM
or
DUPLICATE mode the Hexadecimal
display
will
indicate the pass count in decimal from
00
to
99. At the end
of
pass
99
a read pass compares
the RAM and PROM. If any address does not compare the read pass halts and displays the address and
RAM data in the hexadecimal display, and the PROM data in the binary indicators. The read-check
operation
will
continue
with
the ENTER key.
When the read-check, operation is complete an
"F"
will
appear in the
display
indicating the operation is
finished. -
SPECIAL OPERATIONS
The RAM memory has special operating characteristics which may
be
useful
for
editing
or
adding
to
a
partially programmed PROM. The cO'ntents
of
the PROM in the
COpy
socket are automatically transferred
into
the RAM when the
first
data character is entered in either PROGRAM
or
DUPUCATE. Data can also
be
entered to the RAM from any
ofttje
input
devices (Keyboard, MASTER socket, Paper Tape, TTY, etc.).
If the ADDRESS FIELD
definition
does not include
the
LAST ADDRESS the
inpufoperation
will
result in
only
filling
the specific field of the RAM. Data can be entered
to
the RAM in segments from more than one
input
device.
It is important
to
note that the RESET key causes the entire
COpy
PROM contents
to
be
transferred
to
the
RAM. If
multiple
modes (PROG and
DUP)
are used
to
enter segments
of
data
to
the
RAM the RESET key
should be used only at the sta'rt
to
condition
the RAM. Thereafter
until
the operation
is
complete, mode
changes should
be
made
without
using the RESET key.
When the RAM is
full,
or when
it
is desired
to
initiate
programming, the
PROG
mode can be
used
to
enter
the LAST ADDRESS. When the LAST ADDRESS is entered the programming operation
will
transfer the
complete contents
of
the RAM
to
the PROM using
the
100 pass programming
technique~
,
OPERATIONAL
~DELA
YS
Because
of
the size
of
the 2704
(512
addresses) or 2708(1024 addresses) there will' be some notable
pauses as the Series
90
performs certain operations.
1. Erase check preceeding any operation requires 3 seconds
if
the PROM is
fully
erased.
2. Transferring the contents
of
the PROM
to
RAM which automatically occurs when
the
first
data character is entered in the PROGRAM
or
DUPLICATE modes requires
three seconds.
2
