IMP/TIP memory retrofit schedule (rev 2)
A dated list of when each ARPANET IMP and TIP would get its extra core memory in early 1973.
McKenzie, A.M., "IMP/TIP memory retrofit schedule (rev 2)", RFC 476, DOI 10.17487/RFC0476, March 1973, <https://www.rfc-editor.org/info/rfc476>.
@misc{rfc476,
series = {Request for Comments},
number = 476,
howpublished = {RFC 476},
publisher = {RFC Editor},
doi = {10.17487/RFC0476},
url = {https://www.rfc-editor.org/info/rfc476},
author = {A.M. McKenzie},
title = {{IMP/TIP memory retrofit schedule (rev 2)}},
pagetotal = 2,
year = 1973,
month = mar,
} RFC text
Network Working Group Alexander McKenzie
RFC # 476 BBN-NET
NIC # 14920 March 7, 1973
IMP/TIP Memory Retrofit Schedule (Revision 2)
This revision contains two types of changes to RFC #447. First, the
retrofits to Utah, Belvoir, NOAA, USC, Stanford, ISI, Case, and CCA have
been completed and are therefore removed from the schedule. Second, the
retrofits to UCSB, ETAC, Aberdeen, and Rome have been rescheduled.
The revised text of RFC #447 follows:
During the first several months of 1973 we will be retrofitting each IMP
and TIP with additional core memory. At the end of the retrofit
program, the memory sizes of the various machines will be as follows:
IMP (516 or 316) - 16K words
TIP - 28K words
TIP with Magnetic Tape Option - 32K words
In addition, the expansion of the TIP core memory will necessitate
enlarging the TIP to two cabinets.
Listed below is the schedule for the remaining retrofits. We have
arranged this schedule to coincide with the usual monthly Preventive
Maintenance at each site so as to minimize user inconvenience, but the
work required will frequently require the machines to be down longer
than normal. I will issue additional RFC's updating this schedule as
necessary.
Any site which anticipates difficulty with the expansion of TIP size,
and thus the floor space requirement, should contact Hawley Rising (BBN)
at
(617)491-1850 ext. 473
All dates given below are below in the form (month/day)
SRI (3/7)
ETAC (3/15)
FNWC (3/15
Rome (3/16)
UCLA (3/19)
AMES IMP (3/21)
GWC (3/22)
Carnegie (4/4)
SDC (4/17)
Illinois (4/18)
UCSB (5/1)
Aberdeen (postponed indefinitely)
[ This RFC was put into machine readable form for entry ]
[ into the online RFC archives by Alex McKenzie with ]
[ support from GTE, formerly BBN Corp. 9/99 ]
AI ELI5
On this page
§1What Changed in This Revision
This is the second revision of the memory retrofit schedule first given in RFC 447. It makes two kinds of change. The retrofits at Utah, Belvoir, NOAA, USC, Stanford, ISI, Case and CCA are done and are removed. The retrofits at UCSB, ETAC, Aberdeen and Rome are rescheduled.
The rest of the note repeats the revised text of RFC 447.
Some sites already got their upgrade, so they are crossed off, and a few dates moved.
§2The Memory Retrofit Plan
During the first several months of 1973, BBN retrofits each IMP and TIP with additional core memory. When the program ends, the machines will have these sizes: an IMP (516 or 316) will have 16K words, a TIP will have 28K words, and a TIP with the Magnetic Tape Option will have 32K words.
The larger TIP memory means the TIP must be enlarged to two cabinets. A site that expects trouble with the extra floor space should contact Hawley Rising at BBN.
Each network box gets a bigger memory. The biggest ones also need a second cabinet, so they need more room on the floor.
§3The Remaining Schedule
The dates were chosen to coincide with each site's usual monthly Preventive Maintenance, to cause the least user inconvenience. The work often needs the machine down longer than normal. Dates are given as month/day.
The remaining list runs from SRI on 3/7, ETAC and FNWC on 3/15, Rome on 3/16, UCLA on 3/19, AMES IMP on 3/21 and GWC on 3/22, through Carnegie on 4/4, SDC on 4/17, Illinois on 4/18 and UCSB on 5/1. Aberdeen is listed as postponed indefinitely. The author promises further RFCs if the schedule needs updating.
Each site gets a day on the calendar, usually the day its box is already being serviced. One site's day was put off with no new date.