From f796d233938bb16d136842aa10c92c300a66ebea Mon Sep 17 00:00:00 2001
From: a dinosaur <nick@a-dinosaur.com>
Date: Mon, 1 Apr 2019 16:16:55 +1100
Subject: [PATCH] attempted ca65 conversion

---
 .gitignore     |  3 +++
 jca65/Makefile | 24 ++++++++++++++++++++++++
 jca65/jimmy.S  | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 jca65/Makefile
 create mode 100644 jca65/jimmy.S

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..bf38227
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.prg
+obj/
+*.o
diff --git a/jca65/Makefile b/jca65/Makefile
new file mode 100644
index 0000000..2881ef1
--- /dev/null
+++ b/jca65/Makefile
@@ -0,0 +1,24 @@
+TARGET := jimmy.prg
+SOURCE := jimmy.S
+OBJDIR := obj
+
+CC := cl65
+AS := ca65
+
+OFILES := $(patsubst %.S, ${OBJDIR}/%.o, ${SOURCE})
+
+default: all ${TARGET}
+all: ${TARGET}
+
+${OBJDIR}:
+	mkdir -p $@
+
+${OBJDIR}/%.o: %.S | ${OBJDIR}
+	${AS} $< -o $@
+
+${TARGET}: ${OFILES}
+	${CC} -t none $< -o $@
+
+clean:
+	rm -rf ${OBJDIR}
+	rm -f ${TARGET}
diff --git a/jca65/jimmy.S b/jca65/jimmy.S
new file mode 100644
index 0000000..843eb76
--- /dev/null
+++ b/jca65/jimmy.S
@@ -0,0 +1,42 @@
+	.word $0801		; prg untz untz
+
+.org $801			; basic bootstrap
+	.byte $0c, $08, $0a, $00, $9e, $20
+	.byte $34, $30, $39, $36, $00, $00
+	.byte $00
+
+.res $1000-*
+.org $1000			; actual progrem startshere
+
+	ldx #$08		; Screen colours
+	stx $d020
+	ldx #$00
+	stx $d021
+
+	jsr $e544		; clear screen
+	jsr print_string
+
+loop:
+	lda $dc01		; Scans the keyboard buffer
+	cmp #$ef		; If user presses Space ($ef) then quit
+	bne loop
+
+	rts
+
+.proc print_string
+	ldx #$00
+
+loop:
+	lda message, x
+
+	cmp #$0			; return on null terminator
+	beq :+
+
+	sta $0428, x
+	inx
+	jmp loop
+
+:	rts
+.endproc
+
+message: .byte "welcome to scat os", $00