The critical section to be drawn is so short:
Code: Select all
...
EX DE,HL ; save the current VRAM position for the next iteration
; Start of the critical section of BLNK signal
LD (HL),C ; clear the previous star character in VRAM
LD (DE),A ; draw the current star character in VRAM
; End of the critical section of BLNK signal
...