Add QUIT.SYSTEM

.travis.yml

@@ -0,0 +1,11 @@
+sudo: enabled
+os: osx
+language: c
+
+install:
+- git clone https://github.com/cc65/cc65 /tmp/cc65 &&
+  sudo make -C /tmp/cc65 ca65 ld65 avail &&
+  ca65 --version
+
+script:
+  - make

Makefile

@@ -2,7 +2,7 @@
 CAFLAGS = --target apple2enh --list-bytes 0
 LDFLAGS = --config apple2-asm.cfg
 
-TARGETS = bye.system.SYS buhbye.system.SYS
+TARGETS = bye.system.SYS buhbye.system.SYS quit.system.SYS
 
 .PHONY: clean all
 all: $(TARGETS)

README.md

@@ -60,3 +60,8 @@ next file starting with 'C').
 
 There are a few spare bytes to play with and more can be squeezed
 out, so perhaps further improvements can be made.
+
+## QUIT.SYSTEM
+
+This just invokes the ProDOS quit handler immediately. It can
+be used as the last in a chain of "driver" installers.

quit.system.s

@@ -0,0 +1,35 @@
+
+        .setcpu "6502"
+        .include "apple2.inc"
+        .include "prodos.inc"
+
+        .org    $2000
+
+CLR80VID        := $C00C
+ROMIN2          := $C082
+SETVID          := $FE93
+SETKBD          := $FE89
+INIT            := $FB2F
+HOME            := $FC58
+SETNORM         := $FE84
+
+        cld
+        bit     ROMIN2
+        sta     CLR80VID
+        sta     CLRALTCHAR
+        sta     CLR80COL
+        jsr     SETVID
+        jsr     SETKBD
+        jsr     SETNORM
+        jsr     INIT
+        jsr     HOME
+
+        MLI_CALL QUIT, quit_params
+        brk
+
+quit_params:
+        .byte   4
+        .byte   0
+        .word   0
+        .byte   0
+        .word   0