Technical data

Accu assignments before calling OB 218:
Result
•• If the page is reserved successfully:
- all ACCUs: remain unchanged
- RLO: = 1
- the remaining bit and
condition codes:
are cleared.
•• If the page cannot be reserved:
-
all ACCUs: remain unchanged,
-
RLO: = 0,
-
all other bit and word
condition codes:
are cleared.
Possible errors •• incorrect length ID in ACCU-3-LH
•• source address on the page is incorrect or does not exist
•• specified page number does not exist.
High byte Low byte
Low byteHigh byte
High word
Low word
Page number
0 to 255
xx
ACCU 1
x
31 16 0
Address (relative to start of page)
0...2047
xx
ACCU 2
824 23 15 7
Fig. 6-15 ACCU contents before calling OB 218
6
OB 216 to OB 218: Page Access
CPU 928B Programming Guide
C79000-B8576-C898-01
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