"Multi-level indirection could be used (you could even put the machine in an infinite indirect addressing loop), and in the middle three digits of five-digit addresses (on the 1620 II) they were set to select one of seven index registers. Dan Ryan (2011). History of Computer Graphics. DLR Associates Series. ISBN978-1456751159.
"1963 : On May 6, the IBM 1443 printer, for use with the IBM 1620 data processing system, makes its debut." "DPD chronology". 23 January 2003. Archived from the original on August 20, 2010.
The IBM 1316 was the removable disk pack to the IBM 1311 disk drive of the IBM 1620, which explains the following: "“The Man from U.N.C.L.E.” movie's full of technological anachronisms ... Back in 1963, when the movie took place, there were disk packs available like the 10-pound IBM 1316." "The Man from U.N.C.L.E." movie's full of technological anachronisms".
mcnabbs.org
paul.mcnabbs.org
even five years later, it was still uncommon for a high school to have an IBM 1620: "IBM 1620".
"The main memory was logically arranged as 20,000 6-bit words. Each word comprised four BCD data bits, a "flag" bit, and an odd parity check bit. Though this was its logical arrangement, physically memory was a 100x100 array of 12-bit ferrite core words, which causes a few quirks in the instruction set. All instructions occupied 12 consecutive digits of memory, and were required to start at an even address so that the two-digit opcode could be read in one 12-bit physical word." "The IBM 1620 Model 1 – Physics @ SMU".
"1963 : On May 6, the IBM 1443 printer, for use with the IBM 1620 data processing system, makes its debut." "DPD chronology". 23 January 2003. Archived from the original on August 20, 2010.
