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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
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