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Simple display fix to make last char of last line empty instead of full last line empty! #1

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Merged
okforth merged 2 commits into from
May 19, 2026
+12 −1
Merged

Simple display fix to make last char of last line empty instead of full last line empty! #1

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26d5c36
Simple display fix to make last char of last line empty instead of la…
at-eee May 16, 2026
80b2e73
Disabled blinking cursor effect
at-eee May 19, 2026
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13 changes: 12 additions & 1 deletion automaton/bootsector.asm
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Original file line number Diff line number Diff line change
Expand Up @@ -28,11 +28,18 @@ mov ah, 0x00 ; Set video mode
mov al, 0x03 ; 80x25 text mode, color
int 0x10

; HIDE CURSOR
mov ah, 0x01 ; Set cursor shape function
mov ch, 00100000b ; Set bit 5 to 1 = disable cursor
mov cl, 0
int 0x10

main:
call scan ; print former row
call pass ; update to latter row
call copy ; fill former with latter
call sleep
call print_last_char ; Prints last character in line
jmp main

sleep:
Expand Down Expand Up @@ -97,14 +104,15 @@ cell:

scan:
mov di, former
mov si, former + 80
mov si, former + 79 ; 79 and not 80 to emit last character just after sleep and not in this procedure.
.loop:
mov al, [di]
call ascii
call emit
inc di
cmp di, si
jb .loop
mov [last_char], al ; Last character stored in last_char byte variable
ret

ascii:
Expand All @@ -117,6 +125,8 @@ ascii:
.done:
ret

print_last_char:
mov al, [last_char] ; copying from last_char if print_last_char was called instead of emit
emit:
mov ah, 0x0e ; write char in teletype mode
; al = char
Expand Down Expand Up @@ -145,6 +155,7 @@ db 0, 1, 0, 0, 0, 0, 1, 0, 0, 0
db 0
latter:
times 80 db 0
last_char db 0

; pad with zeros until magic number
times 510 - ($ - $$) db 0
Expand Down