basic dev environment

.gitignore

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+*.o
+*.nes
+*.nes*
+.DS_Store

.vscode/tasks.json

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+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "ca65",
+			"problemMatcher": [
+				"$ca65",
+				"$ld65"
+			],
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			},
+			"label": "ca65: Build without config"
+		}
+	]
+}

cl65config.json

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+{
+    "executable": "C:\\cc65\\bin\\cl65",
+    "input": "main.s",
+    "params": "--verbose --target nes -o demo.nes"
+  }

main.s

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+.segment "HEADER"
+    .byte $4E, $45, $53, $1A ;Nes header identifier
+    .byte 2 ;2x 16KB PRG code
+    .byte 1 ; 1x 8KB CHR Data
+    .byte $01, $00 ; mapper 0, vertical mirroring
+
+.segment "VECTORS"
+    .addr 0 ; nmi interrupt
+    .addr reset ; reset interrupt
+    .addr 0 ; external interrupt
+
+.segment "STARTUP"
+
+.segment "CODE"
+
+reset:
+    ldx #3
+    inx
+    inx
+    dex
+
+    ldy #7
+    dey
+    rts