--------------------------<snip>------------------------------------
IIRC, the DAT box was optional on the 370/145 and became standard on the
370/148.
No; the "upgrade" on the 370/145 was a new floppy disk.
--------------------------<unsnip>----------------------------
Isn't that also an upgrade???
----------------------------<snip>----------------------------------
Ditto the 370/155 and 370/158 and 370/165 and 370/168.
No; the DAT boxes on the 370/155 and 370/165 were post-delivery field
upgrades[1], not options that you could order. At $200K (155) and $400K
(165), it wouldn't have made economic sense either to offer or to order a
370/155 II or 370/165 II once the 158 and 168 were announced.
<>---------------------<unsnip>-----------------------
Aren't the 155/a55 II/158 "group" the same basic processor, within that
"group"? And aren't the 165/165 II/168 "group" also the same basic
processor, within that group?
--------------------------<snip>------------------------------
The 168 was unique in the 370 series because it used outboard
channels; as I recall , it was the only 370 that did so.
The 165, 165 II, 168 and 195 all had outboard channels; I don't know
whether you consider the 370/195 to be a true S/370.
-------------------------<unsnip>----------------------------------
In re the 165, 165 II and 168, you're quite right. I don't consider the
370/195 to be a true s/370, inspite of the marketting blurbs.
Is it worthwhile to split the hairs so finely? As long as the general
idea gets across? This is all ancient history, mostly of interest to us
"old timers".
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