DM. | tage of larger memories, new devices...
PENNEEEamAd new functional reguirements. It. was:

PG WEEKNAPPLICATION DEVELOPMENT.

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h-< Ham r of users of 9370, 4341, |"... of both its customers and itself.
| This is the ke trepačie žinal 308x and 3090 sys-', Complete replacement of midrange
ME id part ofa tems have begun replacing these ma- ' 48/870 systems with AS/400-based solu-
Bana o IBMs. ' chines with AS/400 computers. In most,'". tions is rapidly becoming more popular,
j AS/200, which /—— cases, these users were unable to keep ::': but it is not always appropriate. For ex-
||" ezamines the '' up with the most advanced S/370 sys-/';'// ample, S/370 systems used for technical

limitations of <' ' DOS/VSE operating system. In the S/370 Uh ics are not candidates for EL
this midrange s" environment, either they pay for expen- /'/ by AS/400 computers. And A SYs-
se AN | family of,com-. | sive conversions and the hardware to !' (| tems are not practical for very high B
Tam. puters. '%//. '.'— support them, or they live without the svi Dom denar pe apb
7. For years, ";/% / | desired functional capability""' —...,/, cations, large networks or tl o audi:
AMES (IBMs S/370.'—% ,. ' The AS/400 offers these users some '/'!,:; ment of unusual devices.
U ' mainframe archi- ,. significant advantages: ' '//f!://4« "ls" Also, it seldom makes sense to replace
M ARTIN tecture has of-. ;',8 no future operating-system con: '.3/;0:!: | S/370 applications that. do not need
MM - fered anad- '';'  versions; ' ' začne A Sej) 7 ZE, changes, especially if they're based ono
[m vanced, sophisti-  .. € lower support costs; ':: "ala! v/c, an application package in which there is
- cated environment for developing and ... | | | | SA je | ni
running commercial applications. Many, ::
users remain convinced that the only '"'
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dors such as Amdahl. iisik rm | edi done bei tit rem kel remont, Podrejeni Erori: Przdereba
li S/370 systems are so advanced and: MMEMHH S/a10.MAainfra megdjimiine se ii
so dominant, why are so many of their. kaka kia oseh
users rushing to buy AS/400 systems? '"'
The answer: It's not always easy or cost:
effective to take advantage of the capa: ' |
bility of S/370 computers. —:"" %;: MM ANJE
|. 8/870 systems have evolved over 20''
| Years. As hardware capability improved, '
—1t was necessary to create a series of adv

| new operating systems to take advan: he

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also necessary to create a complex set ze poo PIV p- POKER PRA A 9
of systems-software products to supple- : jo: zdi ibiaš "ve PREVAJA AI MN
ment the operating-system functions. .5x):
Each product, including VTAM/NCP, 7
CICS, DB2, IMS, CMS and TSO, added an.
important functional element not includ- ie

' Support Costs Are High :'::. ae: NJE Dip tke h ei] ij ER JN

| An S/870 installation usually has a VE: Ne Downsized sti ze: giji VEN, pode
number of these software products in- 4; Networked with PO/oc fo
stalled on one or more Computers. Fre-" dek IC TWOTKE with P / 2S tor: PAL
kA number of different operating bi distributed processing po eršije |

, Systems (or versions of the same one) ''< s "Simple, consolidated software;
run on S/370 systems in a network. The ič % Limi | si ge Čim rer PNE

tol a hladi. He% bie oo] 4: bes; dai, -; nili ij

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Cost of supporting a sophisticated S/370 " MEH ;
environment can be very high because ' '
full-time experts are needed to support.
each software product. ai:

Large organizations can absorb the '
high cost, However, if smaller S/370 US-

- s want the full functional capability
that the larger users have, they must in.

a ni

Mma
dj

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wide a base |

Vantage of the 8/370
| Freguently,

larger users. As a re... '. niče RNI va

ALIC can take full ad-/ € higher p OSgrz m

environment." WE) /,6 affordable mela a.

8/370 users also face a / .. cessino pov abonal data na
regularly de-.':, ' lowero ons costs; "lji,

software ; bi Hi » simpler, less expensive syst em 9 K či il ča AE

ort oa: V UL | sek breča ti Lkiu (ng conditions exists:

- at ut j oplication packages una'% die Conversion to a new operating system

| "xpensive and time NE poten PBrades to hardware and. ljuje io a, € Y H the conversio

ii The AS/400 soft SI POSE Ja ča] a kili: koso one of the MVS operating

No o aa mA o meni obupen

A no Comparable AS/400 package. ih
/" m Be tora Vi ; 8/8370 applica-
th AS/ applications is most

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strengths and .  tems-software products. Many use the ''/; applications such as engineering graph- .

New St, Carnforth, Lan , LA5
United Kingdom ( 0524) 734 505.

? The cost of support functions such as
systems programming, communications
" management, database administration
and operations has grown to represent a
high percentage of total spending on in-
- formation systems (25 percent or more).
€ A new application must, be developed
rapidly. ae
' Programming resources are limited.
Management is unwilling to spend the
resources needed to support an effective
S/370 environment.
8 Users are unhappy with the time re-
guired to create new systems and are
looking increasingly to PC network-
based solutions to meet their needs.
Moving an application from an S/370
to an AS/400 usually involves complete-
ly replacing the S/370 application. Ideal-
ly, the new application will be package-
based, thus avoiding a complete rede-
sign. Retraining users, along with
creating a new set of interfaces with
other applications, is usually necessary.
Many S/370-oriented organizations are
concerned about the prospect of com-
pletely replacing applications. The origi-
nal applications usually take years to
develop and enhance, and there is a
feeling that a large investment will be
lost in a complete replacement. There js
also a concern that replacement will be

' as lengthy as the original development.

Companies that have moved applica-
tions to the AS/400 have shown, howev-
er, that it can be accomplished more
rapidly than most S/370 organizations
would believe possible, especially if
packaged applications are used. In addi-

"ton, it's often possible to significantly
improve the applications during the re-
placement process, partly because older
and less sophisticated applications are
the best candidates for replacement.
It is also possible to improve applica-

-tions as they are moved to the AS/400

duse it is easier to develop appli
Ip applica-
tions that are fully interactive and use a

| relational DBMS on the AS/400.

Moving applications from an S/370
environment to an AS/400 environment
is not a simple task. Terms used to de-
scribe the process include "Conversion,"

migration" and "downsizing."
ene k en tation of integrated
omputing environments, such as IBMs
Šime sne te pPlication Architectu zi

Celerate the migration of applications
from S/370 central O ee o sme
works of AS/400s and desktop work-
stations. The Conversion from centra].

-. ized to distributed applicati
plications
major challenge of the 1990s. will be a

— Next week, TU review the advanced

il sensible when one or more of the follow. ' the Adel concepte incorporated in

SEOgO A ouar
ting system. dueta, nelable through High, Pro-
Neda

mačton on seminars, please t
the United States and Ginadaj TA

vity Software Inc. of M
Mass. ( 800) %42 1840 Forte,

2 09y Transfer Institute, 741 10th St.

8305 Calif. 90402 (213) 394.

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