The DEUCE was one of the earliest British commercially available computers, built by English Electric in the early 1950s.
It was a productionized version of the Pilot ACE. It had 1450 thermionic valves, and used mercury delay lines for its main memory; each of the 12 delay lines could store 32 instructions or data words of 32 bits. It shared the 1 megahertz clock rate of the Pilot ACE. The DEUCE also had a magnetic drum for storage.
The first machines were delivered in the spring of 1955; in late 1955 a DEUCE 2 improved model appeared, to be followed by a DEUCE 2A in 1957.
Programming had an added complication as each instruction had to wait its turn in the delay line - the order of instructions affected performance. Reading data from a card reader had to be done in real-time - each row had to be read as it passed the read heads - no stopping! The front panel also had a CRT display which showed the current contents of store.
A total of 31 DEUCE machines were sold between 1955 and 1964.
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It was a productionized version of the Pilot ACE. It had 1450 thermionic valves, and used mercury delay lines for its main memory; each of the 12 delay lines could store 32 instructions or data words of 32 bits. It shared the 1 megahertz clock rate of the Pilot ACE. The DEUCE also had a magnetic drum for storage.
The first machines were delivered in the spring of 1955; in late 1955 a DEUCE 2 improved model appeared, to be followed by a DEUCE 2A in 1957.
Programming had an added complication as each instruction had to wait its turn in the delay line - the order of instructions affected performance. Reading data from a card reader had to be done in real-time - each row had to be read as it passed the read heads - no stopping! The front panel also had a CRT display which showed the current contents of store.
A total of 31 DEUCE machines were sold between 1955 and 1964.
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