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delete old program

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sfja 2026-01-25 00:18:37 +01:00
parent 0e594245c2
commit 7878663268
1 changed files with 0 additions and 91 deletions
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91
programs/echo_keyboard.txt
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@ -1,91 +0,0 @@
%define KBD_STATUS 0x1ffc
%define KBD_CODE 0x1ffe
%define VCD 0x2000
%define FL_EQ 0x2
%define FL_EQ 0x4
%define KBD_FLAG_IS_RELEASE 0x1
mov rsp, 0x1000
mov rbp, rsp
mov r0, 512
mov r1, 1
dskr r0, r1
; setup video character display (VCD)
; descriptor table structure:
; [addr + 0] memory map base
mov r0, VCD
mov [0x700], r0
lvcd 0x700
; setup keyboard (KBD)
; descriptor table structure:
; [addr + 0] status address
; [addr + 2] keycode address
; [addr + 4] keyboard interrupt handler
mov r0, KBD_STATUS
mov [0x702], r0
mov r0, KBD_CODE
mov [0x704], r0
mov r0, key_press_int
mov [0x706], r0
lkbd 0x702
; character counter
mov r0, 0
mov [0x600], r0
main_loop:
hlt
jmp main_loop
key_press_int:
mov r0, [KBD_STATUS]
and r0, r0, KBD_FLAG_IS_RELEASE
jnz r0, .leave
mov r0, [0x600]
add r0, r0, VCD
mov r1, [KBC_CODE]
cmp r1, 44 ; spacebar
mov r2, rfl
and r2, r2, FL_EQ
jnz r2, .incr
add r1, r1, 61
mov byte [r0], r1
.incr:
mov r0, [0x600]
add r0, r0, 1
mov [0x600], r0
.leave:
reti
scancode_to_char:
cmp r1, 61
mov r2, rfl
and r2, r2, FL_LT
jnz .not_letter
; if r1 > 86 { goto .not_letter }
cmp r1, 86
mov r2, rfl
xor r2, 0xffff
and r2, r2, FL_EQ | FL_LT
mov r4, rfl
and r4, r4, FL_EQ
shr r4, r4, 2
.not_letter:
61 >= 61
; vim: syntax=nasm