Update makefile to allow setting bootrom path and improve comments.

Author: ejaquay

.gitignore

@@ -1,3 +1,5 @@
+moduledir
+vccromdir
 bootstrap
 bootstrap.rom
 *.swp

bootstrap.asm

@@ -3,7 +3,7 @@
 *
 * After assembly boottrack with boot_emu is appended.
 *   ops="--raw -D DISKROM=1 -D H6309=1 -D DEBUG=0"
-*	lwasm $ops -o bootstrap bootstrap.asm
+*   lwasm $ops -o bootstrap bootstrap.asm
 *   cat bootstrap boottrack > bootstrap.rom 
 *   truncate -s 8192 bootstrap.rom
 *
@@ -17,7 +17,7 @@
 * When Super Extended Basic sees a rom starting with "DK" it 
 * is processed as a disk11 rom. Basic copies it to ram then 
 * makes changes to it before jumping to $C002. We need to set 
-* ROM mode to avoid those changes.
+* back to ROM mode to not see those changes.
 
  IFNE DISKROM
   fcc "DK"       ROM to disk11 rom 
@@ -27,6 +27,10 @@
  ENDC
 
 * Copy bootstrap containing REL, BOOT, and KRN to $2600.
+* REL will copy these to $ED00 and run them.  It is possible
+* to copy bootstrap to $ED00 directly by switching back and
+* forth between ROM and RAM modes as chunks are copied but
+* this is not done here.
 
  ldu #boottrack where the bootstrap modules are
  ldy #$2600     where they are copied to low RAM

makefile

@@ -1,26 +1,23 @@
-# Need to know where the modules are
-ifndef NITROS9DIR
-NITROS9DIR  = $(HOME)/git/nitros9
-endif
 
+# ROM build options. See bootstrap.asm for their purpose
 ROMOPTS = -D DISKROM=1 -D H6309=1 -D DEBUG=0
 
-# Adjust boot targets here
-REL  = $(NITROS9DIR)/level2/coco3_6309/modules/rel_80
-BOOT = $(NITROS9DIR)/level2/coco3_6309/modules/boot_emu
-KRN  = $(NITROS9DIR)/level2/coco3_6309/modules/krn
+# Rom and nitros9 module paths. These can be adjusted to suit
+BOOTROM = ./vccromdir/bootstrap.rom
+MODDIR  = ./moduledir
+REL  = $(MODDIR)/rel_80
+BOOT = $(MODDIR)/boot_emu
+KRN  = $(MODDIR)/krn
 
-# NOTE: You may have to add boot_emu to the BOOTERS target
-#       in $(NITROS9DIR)/level2/coco3/modules/makefile
-
-all: bootstrap.rom
+all: $(BOOTROM)
 
 clean:
-	@rm -f bootstrap bootstrap.rom
+	rm -f bootstrap $(BOOTROM)
+	make all
 
 bootstrap: bootstrap.asm
 	lwasm $(ROMOPTS) --raw -o$@ $< 
 
-bootstrap.rom: bootstrap $(REL) $(BOOT) $(KRN)
+$(BOOTROM): bootstrap $(REL) $(BOOT) $(KRN)
 	cat $^ > $@
-	truncate -s 8192 bootstrap.rom
+	truncate -s 8192 $(BOOTROM)