some low level routines

[kerim]

Does anyone have assembler low level routines for reading a character from keyboard, displaying a character on the screen clearing the keyboard buffer, moving a cursor, etc.

[Pype.Clicker]

for what environment ? plain hardware ? BIOS ? MS-DOS ?

[distantvoices]

mov ax,0xb8000
mov gs,ax
mov [gs:2],'q'

simplest code to put a character on the screen.

[kerim]

I said 'low level' which, of course, means hardware level

[Pype.Clicker]

that's because at the lowest level, there's no keyboard buffer...
reading a character from the keyboard is done with

Code: Select all

in al,0x60
cmp al,128
jae .keyup
;; key with scancode <al> pressed
.keyup:
;; key with scancode <al&127> released.

For the cursor (text) placement, check the VGA registers, and mainly the Cathod Ray Tube Controller (CRT controller) registers...
I've seen a reference to it in a 2-weeks old thread called something like "print function" ...

[kerim]

Are there any texts on the Web dealing with VGA registers and low level VGA programming ?

[Pype.Clicker]

yep. try google, or search within the forum's archive ...