Radio Shack TRS-80 model III Owner's Manual page 86

TRSDOS
Entry Conditions
(DE)
=
DCB
CALL $POSEOF
Exit
Conditions
z
=
Good
file
specification
nz
=
Bad
file
specification
$SYNTAX—
17436/X'441C'
Move
a
file
specification
to
dcb. This routine takes a
file
specification
and
checks
it
for validity
and
moves
it
to a
dcb
so that the
file
may
be opened.
Entry
Conditions
(HL)
=
Filename
(DE)
=
DCB
CALL $SYNTAX
Exit
Conditions
z
=
Good
file
specification
nz
=
Bad
file
specification
$DIVIDE
—
17489/X'4451
'
The
divide routine takes a 16-bit
dividend
and an
eight-bit divisor.
After
division, the quotient replaces the 16-bit
dividend and
the
remainder
replaces the
eight-bit divisor.
Entry Conditions
hl
=
Dividend
a
=
Divisor
CALL $DIVIDE
Exit
Conditions
hl
=
Quotient
a
=
Remainder
(0 indicates
no
remainder).
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