1. Apply corrections to emulator/B220Processor.js uncovered by the
paper-tape diagnostic routines acquired by Al Kossow:
a. Integer divide: sign of R must be preserved on overflow,
otherwise must be set to sign of the dividend (A register).
b. Floating division: sign of R must be preserved, correct align-
ment of operands in registers before starting division cycles,
perform 11 division cycles instead of 10, reconstruct A and R
registers if exponent overflow is detected during post-divide
mantissa normalization.
2. Disable console keyboard after ADD button is pressed.
3. Correct alphanumeric character code translation used by the internal
memory dump routine to match that for console and paper-tape I/O.
4. Fix bug with backward magnetic tape positioning (MPB) for tape
blocks less than 20 words long.
2665c6066e