On Sun, Dec 27, 2015 at 12:09:03AM +1000, Warren Toomey wrote:
Doug reports in a private e-mail that the physical page A7 is missing,
so he is unable to scan it in. Oh well.
Actually, we can probably substitute part of the db(1) man page from 1st
Edition Unix for the missing page A7:
= When preceded by an expression, the value of the
expression is typed in octal. When not preceded by an
expression, the value of. "." is indicated. This
command does not change the value of ".".
: An attempt is made to print the given expression as a
symbolic address. If the expression is relocatable,
that symbol is found whose value is nearest that of
the expression, and the symbol is typed, followed by a
sign and the appropriate offset. If the value of the
expression is absolute, a symbol with exactly the
indicated value is sought and printed if found; if no
matching symbol is discovered, the octal value of the
expression is given.
The following command may be used to patch the file being
! This command must be preceded by an expression. The
value of the expression is stored at the location
addressed by the current value of "." . The opcodes do
not appear in the symbol table, so the user must
assemble them by hand.
The following command is used after a fault has caused a core
image file to be produced.
$ causes the contents of the general registers and
several other registers to be printed both in octal
and symbolic format. The values are as they were at
the time of the fault.
The only way to exit from db is to generate an end of file
on the typewriter (EOT character).