The first Prime system, similar to the DDP 516 but a 32-bit machine with paging
1973: Prime 100 and Prime 300
The Prime 100 was a stripped down version of the Prime 200
(no memory parity or floating point).
The Prime 300 was the current system at the
time ICF was being launched.
1976: Prime 400
By 1977,
the Prime 300 was being replaced by the Prime 400.
The Prime 300 was withdrawn in 1979. The ICF Prime 400 arrived in December 1977.
1979: Prime 450, 550, 650 ,750
The Prime 550 was an upgrade in performance over the Prime 400
while the Prime 750 was a major upgrade
which was very competitive with a similarly priced DEC VAX System. PRIMENET and the local area network software RINGNET
were announced. Four Prime 550 systems were installed in 1979 and 1980. Prime 750 systems were installed at RAL and UMIST.
1980: Prime 150 and 250
1981: Prime 850
Prime also marketed MEDUSA CAD Software
1982: Prime 2250
1984: Prime 2550, 9650, 9750
1985: Prime 9955, 9655, 2655
A Prime 9955 was installed at UMIST and a Prime 9655 at Nottingham in 1985
1986: Prime 2350, 2450, 9755, and 9955-II
1987: Prime 2455, 2755, 6350, and 6550
A summary of the Prime systems installed by ICF is:
Location
Initial Machine
Intermediate Machine(s)
Final Machine
Date
Type
Date
Type
RAL (Services)
1977
P400
2 × P400; 2 × P750
1986
P9955
RAL (Dev)
1977
P300
P400; P550/1
1986
P9655
Sussex
1979
P550/1
-
-
-
City
1980
P550/1
-
1986
P750
Surrey
1980
P550/1
-
1986
P550/2
UCL
1980
P550/1
-
1986
P750
UMIST
1980
P750
P9950
1985
P9955/1
Warwick
1980
P550/1
P550/2
1986
P750
East Anglia
1979
P400
-
1986
P750
Nottingham
1977
P400
-
1985
P9655
The original Prime 400 ran at 0.5 MIPS, had a main store of 192 Kbytes and 160 Mbytes of disc storage.
Typical configurations for the main systems used by ICF were: