absf
Active Member
OK, so the function "RST $10" displays the character in A to the 7-segment display and auto-adjust the display pointer. I assume.
Then looking at this code:
There are 16 characters (including EOT "0") in the STRING but the display LED can only hold 6 characters at a time. So the TS would need another variable called "pointer" or something to adjust the value of (BC) so it would display like
Welcom
elcome
lcome
come t
ome to ........ etc
Or make use of the index register IX or IY (need to read more on the use of these 2 registers tonight)
Allen
Then looking at this code:
Code:
ORG 1800H
LD A,1 ;
LD BC,STRING ; bc points to the string data in memory
LOOP: ;
LD A,(BC) ; Incarca A cu bitul din locatia BC
CP 0 ; Compara A cu 0(end of STRING data)
JR Z,EXIT ; Daca este egal cu 0 atunci sare la EXIT
RST $10 ; Afiseaza A pe ecran
INC BC ; Incrementeaza BC cu 1 pentru a sari la urmatorul bit
JR LOOP ; Sare la LOOP sa faca din nou
EXIT:
RET ; Ne intoarce la basic
STRING: ;
DEFB "Welcome to UP!"
DEFB 13,0 ; 13 este o noua linie si 0 inseamna sfarsit de dataThere are 16 characters (including EOT "0") in the STRING but the display LED can only hold 6 characters at a time. So the TS would need another variable called "pointer" or something to adjust the value of (BC) so it would display like
Welcom
elcome
lcome
come t
ome to ........ etc
Or make use of the index register IX or IY (need to read more on the use of these 2 registers tonight)
Allen