mirror of https://github.com/zellyn/a2audit.git
85 lines
1.1 KiB
NASM
85 lines
1.1 KiB
NASM
;;; Assembly conversion of listings 1 and 2 from
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;;; http://rich12345.tripod.com/aiivideo/softalk.html#list2
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;;; https://archive.org/stream/softalkv3n02oct1982#page/54/mode/2up
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!convtab <apple ii/convtab.bin>
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!to "apple_split_1.o", plain
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* = $6000
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V2 = $2D ; bottom point for vertical line drawing
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HOME = $FC58
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SETCOL = $F864
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VLINE = $F828
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MSGPOS = $690
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main:
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;;; 100 HOME
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JSR HOME
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;;; 200 FOR K = 0 TO 39
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LDX #39
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loop:
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;;; 210 POKE 1448 + K, 14 * 16
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LDA #$E0
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STA 0x5a8,X
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;;; 220 POKE 2000 + K, 10 * 16
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LDA #$A0
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STA 0x7D0,X
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TXA
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TAY
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;;; 230 COLOR= K + 4
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ADC #4
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JSR SETCOL
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;;; 240 VLIN 25,45 AT K
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LDA #45
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STA V2
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LDA #25
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JSR VLINE
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;;; 250 NEXT K
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DEX
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BPL loop
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;;; 300 VTAB 6: HTAB 17
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;;; 310 PRINT "APPLE II"
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LDX #7
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msgloop:
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LDA message,X
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STA MSGPOS,X
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DEX
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BPL msgloop
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;;; 400 CALL 768
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;;; 500 GOTO 400
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forever:
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jsr sync
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jmp forever
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message: !text "APPLE II"
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sync:
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STA $C052
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LDA #$E0
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loop1:
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LDX #$04
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loop2:
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CMP $C051
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BNE loop1
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DEX
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BNE loop2
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LDA #$A0
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loop3:
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LDX #$04
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loop4:
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CMP $C050
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BNE loop3
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DEX
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BNE loop4
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STA $C051
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RTS
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