IMP/TIP memory retrofit schedule
A preliminary schedule for adding core memory to IMPs and TIPs.
McKenzie, A.M., "IMP/TIP memory retrofit schedule", RFC 434, DOI 10.17487/RFC0434, January 1973, <https://www.rfc-editor.org/info/rfc434>.
@misc{rfc434,
series = {Request for Comments},
number = 434,
howpublished = {RFC 434},
publisher = {RFC Editor},
doi = {10.17487/RFC0434},
url = {https://www.rfc-editor.org/info/rfc434},
author = {A.M. McKenzie},
title = {{IMP/TIP memory retrofit schedule}},
pagetotal = 2,
year = 1973,
month = jan,
} RFC text
Network Working Group Alexander A. McKenzie
RFC 434 BBN-NET
NIC 13658 January 4, 1973
IMP/TIP MEMORY RETROFIT SCHEDULE
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 preliminary schedule for these 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 anticipate 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 in the form (month/day)
Xerox (1/3)
SAAC (1/4)
MIT (1/8)
MITRE (1/9)
Harvard (1/15)
RAND (1/16)
ARPA (1/16)
NBS (1/17)
AMES TIP (1/24)
Lincoln (1/24)
Utah (2/1)
UCSB (2/6)
Belvoir (2/8)
NOAA (2/12)
USC (2/13)
Stanford (2/14)
ETAC (2/15)
Aberdeen (2/22)
ISI (2/22)
Case (2/26)
SRI (3/7)
Rome (3/14)
FNWC (3/15)
UCLA (3/19)
CCA (3/20)
AMES IMP (3/21)
GWC (3/22)
Carnegie (4/4)
SDC (4/17)
Illinois (4/18)
[ 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 ]
ISO Plain Language
On this page
§1Memory After the Retrofit
BBN planned to retrofit each IMP and TIP with additional core memory during the first several months of 1973. The listed final memory sizes were 16K words for an IMP, 28K words for a TIP, and 32K words for a TIP with the magnetic tape option.
The expanded TIP memory would require the TIP to occupy two cabinets.
The upgrade planned different memory sizes for IMPs and TIPs. TIPs would need two cabinets after their memory expansion.
§2Site-by-Site Maintenance Dates
The RFC provides a preliminary list of retrofit dates from January through April. For example, Xerox was scheduled for 1/3, MIT for 1/8, Utah for 2/1, UCLA for 3/19, and Illinois for 4/18.
BBN arranged the schedule to coincide with usual monthly preventive maintenance where possible. The RFC warns that the machines would often be down longer than during normal maintenance, and says the schedule could be updated by later RFCs.
Each site received a planned maintenance date. The work was coordinated with usual maintenance when possible, but could cause longer outages.
§3Space and Rescheduling
Sites that expected difficulty making room for an expanded TIP were asked to contact Hawley Rising at BBN. The schedule gives dates as month and day and presents itself as preliminary.
Sites that needed more room for a TIP were asked to contact BBN. The dates were preliminary and could be updated.