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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.
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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
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