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uartctrl: Implement CP437 to DEC VT character conversion

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Nero 2021-04-05 18:59:44 +00:00
parent 963aebd948
commit 85d0949ec7
3 changed files with 163 additions and 32 deletions
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66
boot/chartab.asm Normal file
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org 0x7C00
init xor ax, ax
mov ss, ax
mov sp, ax
mov ax, 0x0e20
xor bx, bx
int 0x10
mov cx, 0x10
.hloop mov al, 0x20
int 0x10
mov al, cl
neg al
add al, 0x10
call btoa
int 0x10
loop .hloop
mov al, 0x0A
int 0x10
mov al, 0x0D
int 0x10
mov cx, 0x20
.line test cl, 0x0F
jnz .loop
mov al, cl
sar al, 1
sar al, 1
sar al, 1
sar al, 1
and al, 0xF
call btoa
mov ah, 0x0e
int 0x10
mov al, 0x20
int 0x10
.loop mov al, cl
int 0x10
mov al, 0x20
int 0x10
mov al, cl
inc cx
and al, 0xF
cmp al, 0xF
jne .loop
mov al, 0x0A
int 0x10
mov al, 0x0D
int 0x10
cmp cx, 0x100
jc .line
halt hlt
jmp halt
btoa add al, 0x30
cmp al, 0x3A
jc .ret
add al, 7
.ret ret
times (0x1FE - ($-$$)) db 0
dw 0xAA55