In <[EMAIL PROTECTED]>, on 01/29/2006
at 10:00 AM, Anne & Lynn Wheeler <[EMAIL PROTECTED]> said:
>2314 (29 mbytes) and 2301 (paging drum, 4mbytes) were contemporaries
>on 360/67 (early 360/67s tended to have 2311 7mbytes before 2314s
>were available). there were two drum models, 2303 and 2301. the 2303
>read/wrote single head. the 2301 was nearly identical but read/wrote
>four heads in parallel (for four times the data transfer rate).
However, MVS did not[1] support drums, so they weren't an option for
VIO.
>370s (especially after virtual memory was announced) tended to have
>3330-1 (100mbytes) and 2305 (12mbytes, fixed head disk)
Note that you had to use UNIT=3330 if you wanted 3330-1 or 3330-2;
UNIT=3330-1 wpould get you 3330-11 drives. Also, there were two models
of the fixed-head disk; the 2305-1 was twice as fast[2] but provided
only half the space. You did not want to hear or se a head crash on
one.
BTW, do you know anything about a 3165 micro-order for testing 32-bit
(not 31-bit) mode? I could look up the exact field and value if it
would help.
[1] Yes, there was a user mod to support drums for Wylbur paging,
but you still couldn't use them for ASM.
[2] With a two byte channel.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
