add score(初步)

2026-06-15 16:00:47 +08:00 · 2021-03-31 23:29:04 +08:00
parent 7415d0774d
commit 52ac9f147b
9 changed files with 180 additions and 49 deletions
--- a/printbyte.asm
+++ b/printbyte.asm
@@ -0,0 +1,17 @@
+.data zp
+.space _na 1	; a的临时存放处
+.text
+printbyte:
+    sta _na
+    txa
+    pha
+    ldx #8	    ; 打印8bit
+*   lda #$30	; a = '0'
+    asl _na		; 左移一位，溢出到c
+    adc #0		; a = a + c + 0
+    jsr chrout	; putchar(a)
+    dex			; x--
+    bne -		; if(x != 0) goto 上个星号
+    pla
+    tax
+    rts