% Bugs (sigh) in Computers \& Typesetting --- the most recent errata

\input manmac
\font\sltt=cmsltt10
\font\niness=cmss9
\font\ninessi=cmssi9
\proofmodefalse
\raggedbottom
\output{\hsize=29pc \onepageout{\unvbox255\kern-\dimen@ \vfil}}

\def\today{\number\day\
  \ifcase\month\or
  Jan\or Feb\or Mar\or Apr\or May\or Jun\or
  Jul\or Aug\or Sep\or Oct\or Nov\or Dec\fi
  \ \number\year}

\def\cutpar{{\parfillskip=0pt\par}}

\def\rhead{Bugs in {\tensl Computers \& Typesetting as of \today}}
\def\bugonpage#1(#2) \par{\bigbreak\tenpoint
  \hrule width\hsize
  \line{\lower3.5pt\vbox to13pt{}Page #1\hfil(#2)}\hrule width\hsize
  \nobreak\medskip}
\def\buginvol#1(#2) \par{\bigbreak\penalty-1000\tenpoint
  \hrule width\hsize
  \line{\lower3.5pt\vbox to13pt{}Volume #1\hfil(#2)}\hrule width\hsize
  \nobreak\medskip}
\def\slMF{{\manual 89:;}\-{\manual <=>:}} % slant the logo
\def\0{\raise.7ex\hbox{$\scriptstyle\#$}}
\newcount\nn
\newdimen\nsize \newdimen\msize \newdimen\ninept \ninept=9pt
\newbox\eqbox \setbox\eqbox=\hbox{\kern2pt\eightrm=\kern2pt}

\tenpoint
\noindent This is a list of all corrections made to {\sl Computers \&
Typesetting}, Volumes A,~C, and E\null, since 30 September 1989 (when
the revisions for \TeX\ Version 3.0 and \MF\ Version 2.0 were made).
Corrections made to the softcover version of {\sl The \TeX book\/} are
the same as corrections to Volume~A\null. Corrections to the softcover
version of {\sl The \slMF\kern1ptbook\/} are the same as corrections
to Volume~C\null.  Some of the corrections below have already been made in
reprintings of the books. Hundreds of changes, too many to list here,
have been made to Volumes B~and~D because of the upgrades to \TeX\ and
\MF\null.  Readers who need up-to-date information on the \TeX\ and
\MF\ programs should refer to the |WEB| source files until new
printings of Volumes B~and~D are issued. \looseness=-1

% volume A

\bugonpage A99, line 4 from the bottom (2/22/90)

\ninepoint\indent
to be chosen because there was no feasible
way to keep total demerits small.

\bugonpage A156, line 2 (11/18/89)

\ninepoint
Commands like |\mathchardef\alpha="010B| are used in
Appendix~B to define\cutpar

\bugonpage A171, lines 24--26 (3/13/90)

\ninepoint\noindent
formula produces a result exactly equivalent to
`|\left(|\<subformula>|\right)|', when the \<subformula> doesn't end
with Punct, except that the {delimiters} are forced to
be of the |\big| size regardless of the height and depth of the subformula.

\bugonpage A193, lines 16--18 (12/2/89)

\ninepoint\noindent
line if you insert
`^|\noalign||{|^|\break||}|'
after the |\cr| for that line. You can prohibit {\sl all\/} breaks
in an |\eqalignno| if you set ^|\interdisplaylinepenalty||=10000|; or you
can enclose the whole works in a ^|\vbox|:

\bugonpage A233, bottom 9 lines, and top three on next page (12/2/89)

\danger The |\+| macro in Appendix~B works
by putting the \<text> for each column that's followed by~|&|
into an hbox as follows:
\begindisplay
|\hbox to |\<column width>|{|\<text>|\hss}|
\enddisplay
The ^|\hss| means that the text is normally flush left, and that it can
extend to the right of its box. Since |\hfill| is ``more infinite'' than
|\hss| in its ability to stretch, it has the effect of right-justifying or
centering as stated above. Note that |\hfill| doesn't shrink, but |\hss|
does; if the text doesn't fit in its column, it will stick out at the right.
You could cancel the shrinkability of |\hss| by adding ^|\hfilneg|; then
an oversize text would produce an overfull box.
You could also center some text by putting `|\hss|' before it and just
`|&|' after it; in that case the text would be allowed to extend to the
left and right of its column.
 The last column of a |\+|~line (i.e., the column entry that is
followed by |\cr|) is treated differently: The
\<text> is simply put into an hbox with its natural~width.\looseness=-1

\bugonpage A254, line 5 from the bottom (10/5/89)

\ninepoint\noindent
|\vsize| hasn't changed, and if all insertions have been
held in place, the same page break\cutpar

\bugonpage A286, lines 30--32 (3/13/90)

\ninepoint\noindent
reading and expanding this \cstok{par}
token, \TeX\ will see the \<vertical command> token again. \ (The current
meaning of the control sequence ^|\par| will be used; \cstok{par} might no
longer stand for \TeX's |\par| primitive.)

\bugonpage A290, lines 12--13 (3/24/90)

\ninepoint\noindent
simply a single Ord atom without subscripts or superscripts,
or an Acc whose nucleus is an Ord, the
enclosing braces are effectively removed.

\bugonpage A340, nonblank line 11 (3/13/90)

\tenpoint\noindent
|\topglue 1in % This makes an inch of blank space (1in=2.54cm).|

\bugonpage A342, line 6 ( 3/13/90)

\tenpoint\noindent
|\topglue| but not |\hglue|. It does not
illustrate |\raggedright| setting of para-\cutpar

\bugonpage A346, lines 20--21 (12/3/89)

\ninepoint\noindent
streams used by ^|\read| and ^|\write|, to math
^{families} used by ^|\fam|, to sets of hyphenation rules used by
^|\language|, and to insertions (which require
^|\box|, ^|\count|, ^|\dimen|, and ^|\skip| registers all having the
same number).

\bugonpage A346, line 20 from the bottom (12/3/89)

\ninepoint\noindent
manent value. These macros use registers
|\count10| through |\count20| to hold the\cutpar

\bugonpage A346, lines 8--13 from the bottom (12/3/89)

\ninepoint\noindent
number was allocated. The inside story of how allocation is actually performed
should be irrelevant when the allocation macros are used at a higher level;
you mustn't assume that |plain.tex| really does allocation in any
particular way.
\beginlines
|\count10=22 % this counter allocates \count registers 23, 24, 25, ...|
\endgroup

\bugonpage A347, lines 2--5 (12/3/89)

\ninepoint{\parindent=0pt
|\count19=0  % this counter allocates language codes 1, 2, 3, ...|\parbreak
|\count20=255 % this counter allocates insertions 254, 253, 252, ...|\parbreak
|\countdef\insc@unt=20 % nickname for the insertion counter|\parbreak
|\countdef\allocationnumber=21 % the most recent allocation|\parbreak
|\countdef|^|\m@ne||=22 \m@ne=-1 % a handy constant|\par}

\bugonpage A347, new line after former line 17 (12/3/89)

\ninepoint\noindent
|\outer\def|^|\newlanguage||{\alloc@9\language\chardef\@cclvi}|

\bugonpage A352, new line before line 6 from the bottom (3/13/90)

\ninepoint\noindent
|\def\topglue{\nointerlineskip \vglue-\topskip \vglue} % for top of page|

\bugonpage A355, line 8 from the bottom (12/3/89)

\ninepoint\noindent
|  \noindent{\bf#1.\enspace}{\sl#2\par}%|

\bugonpage A363, lines 8--9 from the bottom (12/8/89)

{\ninepoint\parindent=0pt
|  \if@mid \dimen@=\ht0 \advance\dimen@ by\dp\z@ |%
 |\advance\dimen@ by12\p@|\parbreak%
|    \advance\dimen@ by\pagetotal \advance\dimen@ by-\pageshrink|
\par}

\bugonpage A375, line 27 (10/30/89)

\ninepoint\noindent
depending on whether or not |\t|~contains
an asterisk. \ (Do you see why?) \ And here's\cutpar

\bugonpage A393, lines 3--5 from the bottom (12/3/89)

\ninepoint
|\hskip-.17em plus-3em minus.11em|\par
|\vadjust{}\penalty10000|\par
|\leaders\copy\dbox\hskip3.3\wd\dbox plus1fil minus.3\wd\dbox|

\bugonpage A444, line 4 (3/13/90)

\ninepoint\noindent
Shift box~$x$ down by ${1\over2}\bigl(h(x)-d(x)\bigr)
-a$, where $a=\sigma_{22}$, so that the operator character\cutpar

\bugonpage A450, line 8 (12/3/89)

\def\\#1{$_{\kern\scriptspace#1}$}
\ninepoint\indent
{\qquad\tt\\0h\\0e\\0n\\5a\\0t\\0 \\1n\\0a\\0 \\0n\\2a\\0t\\0
  \\1t\\0i\\0o\\0 \\2i\\0o\\0 \\0o\\2n\\0}

\bugonpage A450, line 14 (12/3/89)

\ninepoint
{\tt.\\0h\\0y$_3$p\\0h\\0e\\2n\\5a\\4t\\2i\\0o\\2n\\0.}

\bugonpage A450, lines 19 and 20 (12/3/89)

\ninepoint\vskip-10pt
\begindisplay
\tt\\0o\\2n\\0
\\0o\\0n\\1c\\0
\\1c\\0a\\0
\\1n\\0a\\0
\\0n\\2a\\0t\\0
\\1t\\0i\\0o\\0
\\2i\\0o\\0
\\0o\\2n\\0
\enddisplay
and this yields `{\tt\\0c\\0o\\2n\\1c\\0a\\0t\\0e\\1n\\2a\\1t\\2i\\0o\\2n\\0}',
i.e., `|con-cate-na-tion|'.

\bugonpage A455, last lines before the quotes (11/30/89)

\ninepoint\noindent
sit yourself (even in restricted horizontal mode) by saying
^|\setlanguage|\<number>;\break
 this changes the current language but it
does not change |\language|. Each what-\break
sit records the current
|\lefthyphenmin| and |\righthyphenmin|.

\bugonpage A467, right column (12/3/89)

\eightpoint\indent\hbox to0pt{\hss\lower1pt\hbox{*}}%
|\hfilneg|, 72, 100, 233, 283, 285, 290, 397.

\bugonpage A468, right column (12/2/89)

\eightpoint
|\interdisplaylinepenalty|, {\it193}, 349, 362.

\bugonpage A469, left column (12/3/89)

\eightpoint\indent\hbox to0pt{\hss\lower1pt\hbox{*}}%
|\language| (hyphenation method), 273, 346, $\underline{455}$.

\bugonpage A469, right column (10/30/89)

\eightpoint\indent\hbox to0pt{\hss\lower1pt\hbox{*}}%
|\lefthyphenmin|, 273, {\it364}, $\underline{454}$, 455.

\bugonpage A472, left column (12/3/89)

\eightpoint
|\newlanguage|, 346, $\underline{347}$.

\bugonpage A476, left column (10/30/89)

\eightpoint\indent\hbox to0pt{\hss\lower1pt\hbox{*}}%
|\righthyphenmin|, 273, {\it364}, $\underline{454}$, 455.

\bugonpage A479, new entry (3/13/90)

\eightpoint
|\topglue|, {\it340}, $\underline{352}$.

\bugonpage A480, right column (3/13/90)

\eightpoint
|\vglue|, $\underline{352}$, {\it408}.

\bugonpage A483, the Providence lines (10/8/89)

\noindent[Change the first one to
\begintt
Providence RI 02940\kern.05em-9506, USA.
\endtt
Then the second one will be
\begindisplay
Providence RI 02940\kern.05em-9506, USA.
\enddisplay
The second line will also appear on page C361.]

% volume B
\hsize=35pc
\def\\#1{\hbox{\it#1\/\kern.05em}} % italic type for identifiers
\def\to{\mathrel{.\,.}} % double dot, used only in math mode


% volume C
\hsize=29pc
\def\\#1{\hbox{\it#1\/\kern.05em}} % italic type for identifiers

\bugonpage C220, top line (3/13/90)

\ninepoint\noindent
modes you get into by hitting
`|S|', `|R|', or `|Q|', respectively, in response to error messages\cutpar

\bugonpage C252, line 16 (3/13/90)

\ninepoint\indent
| for i:=1 upto n_windows: display blankpicture inwindow i; endfor|

\bugonpage C264, lines 4--6 from the bottom (3/24/90)

\ninepoint\noindent
|vardef |^|counterclockwise|| primary c =|\par\noindent
| if turningcheck>0:|\par\noindent
|  interim |^|autorounding||:=0;|\par\noindent
|  if |^|turningnumber|| c <= 0: reverse fi fi c enddef;|

\bugonpage C306, line 6 (3/13/90)

\ninepoint\noindent
| ligtable "'": "'" =: oct"042",                         % close quotes|

\bugonpage C309, second line from bottom (11/18/89)

\ninepoint\noindent
| define_whole_vertical_blacker_pixels(vair,slab,| $\cdots$ |);|

\bugonpage C315, line 9 from the bottom (1/2/90)

\ninepoint\noindent
units of printer's points):

\bugonpage C337, line 4 from the bottom (1/7/90)

\ninepoint\noindent
|\def\startfont{\font\testfont=\fontname \spaceskip=0pt|

% Volume D
\hsize=35pc
\def\\#1{\hbox{\it#1\/\kern.05em}} % italic type for identifiers
\def\to{\mathrel{.\,.}} % double dot, used only in math mode

% volume E
\hsize=29pc
\def\dashto{\mathrel{\hbox{-\kern-.05em}\mkern3.9mu\hbox{-\kern-.05em}}}

\bugonpage E325, line 13 (3/13/90)

\ninepoint\noindent
{\bf if} \\{serifs}: $x_{3r}=\max(x_{1r},{\rm hround}(x_1+.5\\{dot\_diam}
 -.2\\{jut})-.5\\{tiny})$\par\noindent
{\bf else}: $x_3=x_1-.5$ {\bf fi};

\bugonpage E483, line 4 (3/13/90)

\ninepoint
\rightline{\% Character codes \oct{000}--\oct{100} and \oct{133}--\oct{177}
 are generated.}

\bugonpage E544, line 5 (3/13/90)

\ninepoint\noindent
\hskip 3em\vdots\hskip2em\raise2pt\hbox{(the rest of the
 program for `$\gamma$' in |greekl| comes here)}

\bugonpage E557, line 9 (3/13/90)

\ninepoint
\rightline{\sl`Nevermore---Ah nevermore.'\thinspace''}

\bugonpage E558, line 21 (3/13/90)

\eightpoint\noindent
|Clasp a rare and radiant maiden whom the angels name Lenore."|

\bugonpage E570, lines 27--28 look better with proper skewchars (3/13/90)

\begingroup
\tenpoint\bf
\textfont0=\tenbf \scriptfont0=\sevenbf
\font\boldi=cmmib10 \font\boldsy=cmbsy10
\skewchar\boldi='177 \skewchar\boldsy='60
\textfont1=\boldi
\textfont2=\boldsy
\noindent Here's some bold 10-point math:
${\hat A}^\Gamma_0
+{\check B}^\Delta_1
-{\tilde C}^\Theta_2
\times{\acute D}^\Lambda_3
/{\grave E}^\Xi_4
\oplus{\dot F}^\Pi_5
\ominus{\ddot G}^\Sigma_6
\otimes{\breve H}^\Phi_7
\oslash{\bar I}^\Psi_8
\odot{\vec J}^{\,\Omega}_9$.
\endgroup

\bye