Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
C onInputFlush
Flush Buffer, Read Keyboard
Function Call OCH
Empties the keyboard type-ahead buffer. Further processing
depends on the value in AL when the function is called:
OlH, 06H, 07H, 08H,
or OAH - The corresponding input system
Any other value
-
Entry Conditions:
AH = 0CH
AL
= function code
OlH, 06H, 07H, 08H, or OAH = call corresponding function
Any other value
= perform no further processing
Exit C onditionsr
If AL = 00H, type-ahead buffer was flushed; no other
processing was performed.
Macro Definition:
call is executed.
No further processing is done.
flujh-and-read- kbd macro witch
mov a1,~witch
m0v ah,ECH
int 21 H
endm
Example:
The following program both displays and prints characters
as they are typed. If
(ENTER] is pressed, the program
sends a
Carriage-ReturniLine-Feed to both the display and
the printer. (The example assumes that
a CONTROL-C
processing routine has been set up before the loop is
entered.)
func-ECH: flush-and-read-kbd 1 ;THIS FUNCTION
pr in t-c har a I ;see Function E5H
CmP a1 ,EDH
;i5 it a CR?
]ne func- 0CH
;no, print it
print- char lE ;5ee Function E5H
display- char 18 ;5ee FunLtion E2H
Imp func- ECH
;get another character
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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200