GEM80-400
5. Central Highway & Fast I/O Modules
Issue 3 04/99
ALSPA GEM
80-400 SERIES CONTROLLERS TECHNICAL MANUAL
Page 5-3
As the Central Highway space is searched from left to right (viewed from the
front of the controller subrack), the first 64K block of RAM configured as Off-line
memory, on the leftmost RAM Module, will become Block Number 0, the next
block, Block Number 1, etc.
As a consequence of this technique, the block number of a physical block of
Off-line memory will change if the number of detected Off-line blocks to the left
of it changes. The user program could check for this potential problem if each
block had its block number written to itself during the commissioning of the
system.
The user program could also use the "OFF-LINE fitted" V-table, V63, to determine
how many Off-line RAM blocks were detected at power up, and compare this
with the number that ought to be present.
The default configuration will allow a maximum of ten 64K blocks of Off-line
memory. The number of blocks and the size of each block is determined by the
values contained in the Off-line set up tables P100 to P115. See chapter 2 for
details.
5.3.2. IMAGEM
Memory
A RAM Module may be used to supply the system with IMAGEM memory
additional to the 64K supplied by the GEM
80-400 Processor Module.
This memory is used by IMAGEM Modules installed in the rack to store format,
function and character definitions. The IMAGEM Modules check the memory at
power up and will provide a warning (a purple screen) if the amount or the
validity of the memory has changed.
We strongly recommend that IMAGEM formats, functions, etc. are archived
before any changes are made to the physical memory, and that the IMAGEM
store is then cleared and reloaded.
5.4.
Fast I/O Equipment
5.4.1. GEM80-400S
Controller
The GEM80/400S controller has a five slot Fast I/O Highway fitted to the left hand
end of the controller subrack. The right most slot is taken up by the fast I/O driver
leaving four slots for fast I/O modules. No central highway slot is required to
accommodate Fast I/O in this controller configuration.
5.4.2.
GEM80-400 Enhanced Controller
The only Fast I/O Module that can be installed within the GEM
80-400 Enhanced
Controller subrack is the Fast I/O Driver Module. Other Fast I/O Modules may be
installed into a separate Fast I/O subrack.
Central Highway Slot 1 is the only slot that can be configured to use a Fast I/O
Driver Module. Slot 1 may be configured for a Fast I/O Driver Module by moving
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