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Memory description 5
Memory Generic 711 (S
and
MS)
The memory requirements for a Generic 7 11 system consists of a Read
Only Memory (ROM) circuit pack and RAM circuit pack(s). The memory
system is divided into pages.
The unprotected and protected data stores are usually assigned to pages 0
and 1.
The bottom 8K words of page 2 are replaced with the QPC486 ROM pack.
The remaining top words of page 2 are assigned to program store.
Page 3 (Input/Output memory) is not assigned to a QPC478 module and
page 4 is not used.
Additional pages of program store are provided as required, by RAM pack
addition or rearrangement.
Configuration Overlay LD 17 is used to assign the RAM type or‘
combination of types for data and program store to a system (see 553-3001-
400).
Memory Generics 811 and 911 (N and XN)
Software and office data for Generics 8 11 and 9 11 are stored in a
RAM
(as
for Generic 7 11) except that QPC426 and/or QPC479 modules (or a
QPC672) are used.
The ROM for Generic 8 11 is contained in a QPC486 pack while the ROM
for Generic 9 11 is part of the QPC443 Control and Timing pack.
Memory Generics 1011 (ST)
Software and office data for Generic 1011 system are stored in a RAM (as
for Generic 7 11) except that QPC673 (with error correction) is used.
The ROM for Generic 1011 is contained in QPC717 ROM pack which
connects to the QPC687 CPU pack.
Memory Generics 1111,1211, and 1311 (NT, XT, and RT)
Software and office data for Generic 1111,1211, and 13 11 systems are
stored in a RAM (as for Generic 711) except that QPC583 modules, with
24-bit addressing, are used.
Memory calculations 553-2201-l 51 Appendix 1