176
Using Memory Cassettes
Section 3-11
tempt is made to write a program larger than 3.2 Kwords to the Memory
Cassette.
2.
When a 8-Kword or larger Memory Cassette is installed in a CPU Unit with
a 3.2-Kword UM (user program) area, programs up to 3.2 KW long can be
read from the Memory Cassette. A non-fatal error will occur if an attempt
is made to read a program larger than 3.2 Kwords from the Memory Cas-
sette.
Note
The two transfers shown above would be completed normally if the program
were 3.2 Kwords or smaller.
The approximate sizes of the programs in the UM (user program) area and
Memory Cassette can be determined by the content of AR 15, as shown in
the following table.
In CQM1H-CPU11/21 CPU Units, the content of AR 1508 to AR 1515 is nor-
mally 04. The content of AR 1500 to AR 1507 is normally 04 when a 4-Kword
Memory Cassette is installed.
The size of the program indicated in AR 15 does not include the NOP(00)
instructions after END(01), but will include any instructions other than
UM area (7.2 Kwords)
Program larger
than 3.2 Kwords
Memory Cassette (4 Kwords)
X
UM area (3.2 Kwords)
Program larger
than 3.2 Kwords
Memory Cassette (8 Kwords)
X
Location
Bits
Content
Meaning
Memory
Cassette
AR 1500
to
AR 1507
00
No Memory Cassette is installed or no program is
saved in the Memory Cassette.
04
The program is less than 3.2 Kwords long and can
be read from any CQM1H CPU Unit.
08
The program is less than 7.2 Kwords long and can
be read from CQM1H-CPU51/61 CPU Units only.
12
The program is less than 11.2 Kwords long and can
be read from CQM1H-CPU61 CPU Units only.
16
The program is less than 15.2 Kwords long and can
be read from CQM1H-CPU61 CPU Units only.
UM area
AR 1508
to
AR 1515
04
The program is less than 3.2 Kwords long and can
be written to any flash-memory or EEPROM Mem-
ory Cassette.
08
The program is less than 7.2 Kwords long and can
be written to an 8-Kword or 16-Kword flash-mem-
ory or EEPROM Memory Cassette.
12
The program is less than 11.2 Kwords long and can
be written to a 16-Kword flash-memory Memory
Cassette only.
16
The program is less than 15.2 Kwords long and can
be written to a 16-Kword flash-memory Memory
Cassette only.
