Support different preludes for different archs (c64 and vic20 now.)

README.md

@@ -79,10 +79,6 @@ are trashed inside the block.
 Not because it saves 3 bytes, but because it's a neat trick.  Doing it optimally
 is probably NP-complete.  But doing it adequately is probably not that hard.
 
-### Different preludes for different architectures
-
-`--prelude=c64-basic`
-
 ### And at some point...
 
 *   `low` and `high` address operators - to turn `word` type into `byte`.

bin/sixtypical

@@ -37,10 +37,11 @@ if __name__ == '__main__':
         help="Only parse and analyze the program; do not compile it."
     )
     argparser.add_argument(
-        "--basic-prelude",
-        action="store_true",
-        help="Insert a Commodore BASIC 2.0 snippet before the program "
-             "so that it can be LOADed and RUN on Commodore platforms."
+        "--prelude", type=str,
+        help="Insert a snippet before the compiled program "
+             "so that it can be LOADed and RUN on a certain platforms. "
+             "Also sets the origin. "
+             "Options are: c64 or vic20."
     )
     argparser.add_argument(
         "--debug",
@@ -93,10 +94,16 @@ if __name__ == '__main__':
         fh = sys.stdout
         start_addr = 0xc000
         prelude = []
-        if options.basic_prelude:
+        if options.prelude == 'c64':
             start_addr = 0x0801
             prelude = [0x10, 0x08, 0xc9, 0x07, 0x9e, 0x32,
                        0x30, 0x36, 0x31, 0x00, 0x00, 0x00]
+        elif options.prelude == 'vic20':
+            start_addr = 0x1001
+            prelude = [0x0b, 0x10, 0xc9, 0x07, 0x9e, 0x34,
+                       0x31, 0x30, 0x39, 0x00, 0x00, 0x00]
+        else:
+            raise NotImplementedError
 
         # we are outputting a .PRG, so we output the load address first
         # we don't use the Emitter for this b/c not part of addr space

loadngo-c64.sh

@@ -5,11 +5,11 @@ if [ "X$X64" = "X" ]; then
 fi
 SRC=$1
 if [ "X$1" = "X" ]; then
-    echo "Usage: ./loadngo.sh <source.60p>"
+    echo "Usage: ./loadngo-c64.sh <source.60p>"
     exit 1
 fi
 OUT=/tmp/a-out.prg
-bin/sixtypical --traceback --basic-prelude $SRC > $OUT || exit 1
+bin/sixtypical --traceback --prelude=c64 $SRC > $OUT || exit 1
 ls -la $OUT
 if [ -e vicerc ]; then
     $X64 -config vicerc $OUT

tests/SixtyPical Compilation.md

@@ -7,7 +7,7 @@ SixtyPical to 6502 machine code.
 [Falderal]:     http://catseye.tc/node/Falderal
 
     -> Functionality "Compile SixtyPical program" is implemented by
-    -> shell command "bin/sixtypical --basic-prelude --traceback %(test-body-file) >/tmp/foo && tests/appliances/bin/dcc6502-adapter </tmp/foo"
+    -> shell command "bin/sixtypical --prelude=c64 --traceback %(test-body-file) >/tmp/foo && tests/appliances/bin/dcc6502-adapter </tmp/foo"
 
     -> Tests for functionality "Compile SixtyPical program"
 

tests/appliances/bin/dcc6502-adapter

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-# script that allows the binary output of sixtypical --basic-prelude --compile to be
+# script that allows the binary output of sixtypical --prelude=c64 --compile to be
 # disassembled by https://github.com/tcarmelveilleux/dcc6502
 
 import sys