I once worked in a shop where there were two 3420s and a 3803 in the financial area, in a separate room from the offices with a raised floor. Apparently, it was right at the limit for bus and tag. I don't remember why they needed to mount and store their own tapes, though.
On Wed, Jun 25, 2025 at 9:06 AM Harry Wahl < [email protected]> wrote: > Phil, > > Here is a link to the applicable physical planning guide with requirements: > > > http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/370/fe/GC22-7064-13_Input_Output_Equipment_Installation_Physical_Planning_Mar93.pdf > > Look on page 112. > > When I worked for IBM in the 1970s I saw a few running in offices > sometimes with a 3803 sometimes without. Usually with the channel or > control unit cables snaked under or through a wall. The intent was to keep > people out of the mainframe room. > > Also, they required 3-phase electricity and the floor had to checked to > make sure it could support the weight. Standard building codes specify how > much weight an office floor must support and it was much less than the > 3803/3420's weight so a licensed engineer had to certify that that > particular floor could support its weight. > > Dr. Harry J. Wahl > ________________________________ > From: IBM Mainframe Discussion List <[email protected]> on behalf > of Phil Smith III <[email protected]> > Sent: Wednesday, June 25, 2025 9:19 AM > To: [email protected] <[email protected]> > Subject: 3420 environmentals? > > Anyone remember whether 3420s had to be in a chilled room or not? Could > you have had one in a regular office? I forget how much heat they put out. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > -- Jay Maynard ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
