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Put EttinOS programs into git

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Juhani Krekelä 2021-07-09 01:06:08 +03:00
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1
.gitignore vendored Normal file
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*.bin

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CC0 Normal file
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Makefile Normal file
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OLDBINS = echo.bin
BINS = dec2hex.bin hex2dec.bin echo.bin rot13.bin
.SUFFIXES:
.SUFFIXES: .asm .bin
most: $(BINS)
all: $(BINS) $(OLDBINS)
.asm.bin:
nasm -fbin -o $@ $<
clean:
rm -f *.bin
install: $(BINS)
@test -n "$(DISKIMG)" || { echo "DISKIMG not set, point at EttinOS disk image." >&2; exit 1; }
mcopy -o -i "$(DISKIMG)" $(BINS) ::
.PHONY: all clean

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dec2hex.asm Normal file
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cpu 8086
org 0x3000
xor dx, dx
cmp byte [si], 0
jne atoi
mov ah, 2
mov si, overflow_msg
int 0x21
int 0x20
atoi:
lodsb
cmp al, 0
je .end
cmp al, '0'
jl .notdigit
cmp al, '9'
jg .notdigit
xor ah, ah
sub al, '0'
mov cx, ax
mov ax, dx
mul word [ten]
test dx, dx
jnz .overflow
mov dx, ax
add dx, cx
jc .overflow
jmp atoi
.notdigit:
mov byte [char_slot], al
mov si, notdigit_msg
mov ah, 2
int 0x21
int 0x20
.overflow:
mov si, overflow_msg
mov ah, 2
int 0x21
int 0x20
.end:
std
mov di, hexstring+3
xor bh, bh
mov cx, 4
itoh:
mov bl, 0xf
and bl, dl
mov al, [hexdigits + bx]
stosb
shr dx, 1
shr dx, 1
shr dx, 1
shr dx, 1
loop itoh
cld
mov si, hexstring
mov ah, 2
int 0x21
int 0x20
notdigit_msg db "Not a digit '"
char_slot db 0, "'", 0
overflow_msg db "Value must be in range 0 to 65535", 0
hexstring db "xxxx", 0
hexdigits db "0123456789abcdef"
ten dw 10

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echo.asm Normal file
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org 0x3000
mov ah, 2
int 0x21
int 0x20

101
hex2dec.asm Normal file
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cpu 8086
org 0x3000
xor dx, dx
cmp byte [si], 0
jne htoi
mov ah, 2
mov si, overflow_msg
int 0x21
int 0x20
htoi:
lodsb
cmp al, 0
je .end
.digit09:
cmp al, '0'
jl .notdigit
cmp al, '9'
jg .digitcapital
sub al, '0'
jmp .digit
.digitcapital:
cmp al, 'A'
jl .notdigit
cmp al, 'F'
jg .digitminuscule
sub al, 'A' - 10
jmp .digit
.digitminuscule:
cmp al, 'a'
jl .notdigit
cmp al, 'f'
jg .notdigit
sub al, 'a' - 10
jmp .digit
.digit:
xor ah, ah
test dx, 0xf000
jnz .overflow
shl dx, 1
shl dx, 1
shl dx, 1
shl dx, 1
or dx, ax
jmp htoi
.notdigit:
mov byte [char_slot], al
mov si, notdigit_msg
mov ah, 2
int 0x21
int 0x20
.overflow:
mov si, overflow_msg
mov ah, 2
int 0x21
int 0x20
.end:
mov si, decimalstring + 5
mov ax, dx
itoa:
dec si
xor dx, dx
div word [ten]
add dl, '0'
mov byte [si], dl
test ax, ax
jnz itoa
mov ah, 2
int 0x21
int 0x20
notdigit_msg db "Not a digit '"
char_slot db 0, "'", 0
overflow_msg db "Value must be in range 0 to ffff", 0
decimalstring db "xxxxx", 0
ten dw 10

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old_rot13.disasm Normal file
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; Recreation from disassembly, changing org 0x2000 to 0x3000 should produce
; a binary runnable on current (as of 2021-07-09) EttinOS
cpu 8086
org 0x2000
mov ah, 3
mov al, 255
mov di, buffer
int 0x21
mov bx, buffer
rotloop:
cmp byte [bx], 0
jz .end
cmp byte [bx], 'A'
jl .next
cmp byte [bx], 'M'
jle .inc
cmp byte [bx], 'Z'
jle .dec
cmp byte [bx], 'a'
jl .next
cmp byte [bx], 'm'
jle .inc
cmp byte [bx], 'z'
jle .dec
.next:
inc bx
jmp short rotloop
.inc:
add byte [bx], 13
jmp short .next
.dec:
sub byte [bx], 13
jmp short .next
.end:
mov ah, 2
mov si, buffer
int 0x21
int 0x20
buffer:

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rot13.asm Normal file
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cpu 8086
org 0x3000
mov bx, si
rotloop:
cmp byte [bx], 0
jz .end
cmp byte [bx], 'A'
jl .next
cmp byte [bx], 'M'
jle .inc
cmp byte [bx], 'Z'
jle .dec
cmp byte [bx], 'a'
jl .next
cmp byte [bx], 'm'
jle .inc
cmp byte [bx], 'z'
jle .dec
.next:
inc bx
jmp short rotloop
.inc:
add byte [bx], 13
jmp short .next
.dec:
sub byte [bx], 13
jmp short .next
.end:
mov ah, 2
int 0x21
int 0x20