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jeffshrager
39 lines
1.5 KiB
Plaintext
39 lines
1.5 KiB
Plaintext
Paper tape images of the "doctor" program (aka Eliza) in BBN PDP-1 LISP.
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README This file
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doctor.ptape Paper tape labeled "DOCTOR 10 JULY"
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doctor.ascii doctor.ptape converted from FIO-DEC to ASCII
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scrip.ptape Paper tape labeled "SCRIP 4.1 2 July 1966"
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scrip.ascii scrip.ptape converted from FIO-DEC to ASCII
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bbnlisp.pl BBN-LISP emulator written in Perl
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bbnlib66.lisp Function library for BBN-LISP
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session Transcript of a run on a BBN LISP emulator
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The paper tapes are encoded in a (modified?) FIO-DEC encoding for the
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PDP-1 computer.
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FIO-DEC is an odd parity encoding of PDP-1 "concise code" (with a few
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additional characters). The MSB is the parity bit. Concise code is
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a six-bit code with "upper case" and "lower case" characters that are
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seleced with "shift" codes to switch between upper case and lower case.
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Concise code was converted to ASCII based on the conversion table described
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in F-15D, PDP-1 Handbook, October 1963. Some of the concise codes contained
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in the paper tapes do not have an ASCII equivalent. These were represented
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using the following:
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Upper case octal 05 (or) ! Same representation used by simh
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Lower case octal 40 (dot) @ Same representation used by simh
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Octal 75 (back space) BS
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Lower case octal 14 L14
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Lower case octal 32 L32
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The program can be run under the emulator using the following command line:
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bbnlisp.pl -doctor66 -load bbnlib66.lisp -load doctor.ascii -load scrip.ascii
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Then type (doctor) at the prompt.
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James Markevitch
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December, 2014
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