Tandy 1000 Programmer's Reference Manual page 43

Chapter
1 I
System Calls
ConInputNoEcho
Read Keyboard Function Call 08H
Waits for a character to be typed at the keyboard, and
then returns it in AL. If CONTROL-C is pressed, Inter-
rupt 23H is executed. This call does not echo the charac-
ter. (For a keyboard input function that echoes the
character and checks for CONTROL-C, see Function Call
01H.)
Entry Conditions:
AH
=
r D 8 H
E xi t Conditions:
AL
=
character from keyboard
Macro Iiefinition:
read- k bd macro
mov ah,08H
int 2 1 H
endm
Example:
The following program prompts for a password
(8
charac-
ters maximum) and places the characters into a string
without echoing them.
pa
5 5
word
prompt db "Password:
5 " ;see
Function 09H
db
8
dup(7)
;for explanation o f
$
f unc-08H : display prompt
mov
C X , ~
xor bx,bx
read-k bd
cmp a1,ODH
]e continue
mov password[bxl,al
inc bx
loop get-pass
ge t-pa5
5
:
continue:
;see
Function 09H
;maximum length o f
;password
;BL
can be an index
;THIS FUNCTION
;was
i t
a CR7
;yes,
all
done
; n o , p u t
char.
i n
string
;bump index
;get another character
;BX
ha5 length o f
;password
+
1
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