Matthew Stitt wrote:
Because the FBA's and 8809's were boat anchors. And the 3350's and 3420
gave interchangeability with MVS.
With things connected to normal channels the sky was the limit with what
could be done with the 4331. Using the ICA severely limited your devices.
The 3350 and 3420 tapes could run circles around the standard stuff IBM
wanted to sell with the 4331.
4331 had integrated channels (aka like 370/158 and many other processors) ....
i think you are referring to the integrated controller adapter (as opposed
to integrated channels). part of the ICA case were that run-of-the-mill
controllers were going to be physically on the size of 4331 (or larger)
and cost (unless you could pickup old hardware at surplus prices). An
example of the size ... in addition to the original effort to use it
for 3090 service processor ...
http://www.garlic.com/~lynn/2007p.html#36 Writing 23FDs
research had a project that had a 4331 as a desk-side personal computer.
FBAs were mostly boat anchors because mvs wouldn't ship support for them.
Eventually all physical disks migrated to FBA ... and for mvs compatibility,
there had to be CKD emulation (the first was 3375). misc. past posts mentioning
ckd issues
http://www.garlic.com/~lynn/subtopic.html#dasd
i was told that even if i provided fully tested and integrated mvs fba support,
there would still be a bill of $26m for education, classes, documentation, etc.
In order to justify mvs fba support, i had to show incremental disk sale ROI
(increment gross sales at least 10-20 times the expense) attributed solely to
the availability of the mvs fba support.
misc. past posts mention being quoted $26m as bill for mvs fba education,
classes and documentation:
http://www.garlic.com/~lynn/97.html#16 Why Mainframes?
http://www.garlic.com/~lynn/97.html#29 IA64 Self Virtualizable?
http://www.garlic.com/~lynn/99.html#75 Read if over 40 and have Mainframe
background
http://www.garlic.com/~lynn/2000.html#86 Ux's good points.
http://www.garlic.com/~lynn/2000f.html#18 OT?
http://www.garlic.com/~lynn/2000g.html#51 > 512 byte disk blocks (was: 4M pages
are a bad idea)
http://www.garlic.com/~lynn/2001.html#54 FBA History Question (was: RE: What's
the meaning of track overfl ow?)
http://www.garlic.com/~lynn/2001d.html#64 VTOC/VTOC INDEX/VVDS and performance
(expansion of VTOC position)
http://www.garlic.com/~lynn/2001g.html#32 Did AT&T offer Unix to Digital
Equipment in the 70s?
http://www.garlic.com/~lynn/2002.html#5 index searching
http://www.garlic.com/~lynn/2002.html#10 index searching
http://www.garlic.com/~lynn/2002g.html#13 Secure Device Drivers
http://www.garlic.com/~lynn/2002l.html#47 Do any architectures use instruction
count instead of timer
http://www.garlic.com/~lynn/2003.html#15 vax6k.openecs.org rebirth
http://www.garlic.com/~lynn/2003c.html#48 "average" DASD Blocksize
http://www.garlic.com/~lynn/2003m.html#56 model 91/CRJE and IKJLEW
http://www.garlic.com/~lynn/2004d.html#65 System/360 40 years old today
http://www.garlic.com/~lynn/2004g.html#15 Infiniband - practicalities for small
clusters
http://www.garlic.com/~lynn/2004l.html#20 Is the solution FBA was Re: FW:
Looking for Disk Calc
http://www.garlic.com/~lynn/2004l.html#23 Is the solution FBA was Re: FW:
Looking for Disk Calc
http://www.garlic.com/~lynn/2004n.html#52 CKD Disks?
http://www.garlic.com/~lynn/2005c.html#64 Is the solution FBA was Re: FW:
Looking for Disk Calc
http://www.garlic.com/~lynn/2005m.html#40 capacity of largest drive
http://www.garlic.com/~lynn/2005u.html#21 3390-81
http://www.garlic.com/~lynn/2006f.html#3 using 3390 mod-9s
http://www.garlic.com/~lynn/2006f.html#4 using 3390 mod-9s
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