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AS400.TEC
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1990-07-05
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ID:AS Terminal Emulation Setup IBM AS/400
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, make sure the RAM parameter is on
QEMM (or that QRAM is present with other memory managers that
allow mapping of expanded memory pages between 640K and 1024K
other than the page frame); otherwise, E5250AH.COM accesses vast
portions of the reserved memory area when it loads, and DV 2.26's
XDV may crash on startup if all these areas (except for the
page frame, which the AS/400 software also touches) 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.