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AS400.TEC
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1990-10-08
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ID:AS IBM AS/400 Terminal Emulation Setup
Desqview Technical Note
By Dan Sallitt
The IBM AS/400 is a complicated terminal emulation setup, akin to the 5250.
It usually requires 3 files in config.sys (EIMPCS.SYS (1K), ECYDDX.SYS
(block device - 21K) and FSDD.SYS (needs ECYDDX before it - 59K)) and 2
from the command line (a hardware manager - either E5250AH.COM (8.2K) or
WSEAH.COM, usually - and STARTRTR.COM, which is 56K) to get it going,
followed by a number of other files to implement various functions.
1) One of the cards that the AS/400 software can use, the 5250 card (and
maybe others as well), puts a piece of RAM, 8K or so in size, at xC00
(usually CC00). QEMM 5.00 and other memory managers may not see this RAM.
In addition to excluding this area on your memory manager, use the RAM
parameter with QEMM. If you are using a different memory manager that
provides more than one mappable area above 640k you can also use QRAM.
Otherwise, E5250AH.COM accesses various sections of the reserved memory
area when it loads, and DV 2.26's XDV may crash on startup if all these
areas aren't excluded.
Giving E5250AH.COM the parameter /Mx (where x is the same as above - C by
default) seems to make it access fewer areas, though the areas that are
accessed still need to be excluded if you don't use the RAM parameter or
otherwise map all available areas between 640K and 1024K before the AS/400
software loads.
2) STARTRTR traditionally doesn't like to load inside DV, which means that
everything before it can't load in DV. It's likely that functions loaded
after STARTRTR can load in a window - we have seen STF.COM load and run in
a DV window. On one system that we saw, STARTRTR used an interrupt that
can conflict with DESQview (INT 69), but this isn't the sole cause of its
problems inside DESQview.
3) Usually, after the STARTRTR is run, users run a program FSPC.COM to make
a virtual disk on the mainframe. This program isn't resident and takes no
memory. However, FSPC needs to see FSDD.SYS, and it can't from inside a DV
window, so it currently can't run inside DV. This will get to be an issue
if STARTRTR is ever runnable inside DV.
4) STARTRTR will need 160K of space to load high, even though it settles
down to 56K or so.
5) Some AS/400 drivers and TSR's know about expanded memory and store
something there. Therefore, some of the memory figures that I've quoted may
increase in the absence of expanded memory.
6) If you get the AS/400 software running with DV, it may or may not be
necessary to set Keyboard Conflict to 8. One user thought he needed it set
to 9, which makes no sense to us.
7) We're hearing in March 1990 of new versions of the IBM AS/400 software
that have fewer and smaller files. Apparently the driver FSSD.SYS and the
non-resident FSPC.COM are united in a smaller TSR STARTFLR.COM, which, we
hear from some users, crashes in a DV window in much the same preemptive
way that STARTRTR.COM does.
Copyright (C) 1990 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *