disk and tape loader

the loader is a small program with liblzg only, which loads data from
the snake.pack.lz (from either disk or tape), inflates the ram, and
starts the game

Makefile

@@ -3,17 +3,20 @@
 ASM=$(wildcard src/*.asm)
 RES=res.bin/amour.sid res.bin/levels.bin res.bin/unlzg.bin
 
-.PHONY: debug env clean
+.PHONY: debug env clean all
 
-bin/snake.bin: bin/snake.pack.lz
-	dasm src/cart.asm -Isrc/ -DVERBOSE=$(VERBOSE) -f3 -sbuild/cart.symbols.txt -obin/snake.bin
+all: bin/snake6502.bin bin/snake6502.d64
 
-#bin/tape.prg: bin/snake.pack.lz.file
-#	dasm src/tape.asm -Isrc/ -DVERBOSE=$(VERBOSE) -f1 -sbuild/tape.sybols.txt -obin/tape.prg
+bin/snake6502.bin: bin/snake.pack.lz
+	dasm src/cart.asm -Isrc/ -DVERBOSE=$(VERBOSE) -f3 -sbuild/cart.symbols.txt -obin/snake6502.bin
 
-#bin/snake.pack.lz.file: bin/snake.pack.lz
-#	echo -e "\x00\x80" > bin/snake.pack.lz.file
-#	cat bin/snake.pack.lz >> bin/snake.pack.lz.file
+bin/snake6502.d64: bin/loader.prg
+	c1541 -format "snake6502,01" d64 bin/snake6502.d64
+	c1541 -attach bin/snake6502.d64 -write bin/loader.prg loader
+	c1541 -attach bin/snake6502.d64 -write bin/snake.pack.lz.prg packlz
+
+bin/loader.prg: bin/snake.pack.lz.prg
+	dasm src/loader.asm -Isrc/ -DVERBOSE=$(VERBOSE) -f1 -sbuild/loader.sybols.txt -obin/loader.prg
 
 bin/snake.prg: bin/snake.pack
 	dasm src/prg.asm -Isrc/ -DVERBOSE=$(VERBOSE) -f1 -sbuild/prg.symbols.txt -obin/snake.prg
@@ -24,6 +27,10 @@ bin/snake.pack: env $(ASM) $(RES) bin/explodefont
 bin/snake.pack.lz: bin/snake.pack liblzg/src/tools/lzg
 	liblzg/src/tools/lzg bin/snake.pack > bin/snake.pack.lz
 
+bin/snake.pack.lz.prg: bin/snake.pack.lz
+	echo -n -e "\x00\x80" > bin/snake.pack.lz.prg
+	cat bin/snake.pack.lz >> bin/snake.pack.lz.prg
+
 liblzg/src/tools/lzg:
 	cd liblzg/src && make
 

README.md

@@ -7,19 +7,20 @@
 Current development status [here](https://git.giomba.it/giomba/snake6502).
 
 ## Download
-* [.prg](dist/snake.prg) for tapes and disks (size not optimized, yet)
-* [.bin](dist/snake.bin) for 8KiB cartridges
+* [.d64](dist/snake6502.d64) for floppy disks
+* [.bin](dist/snake6502.bin) for 8KiB cartridges
 
 ## Compile
 You need the GNU compiler collection and the [dasm](https://dasm-assembler.github.io/) macro assembler, then:
 ```
+$ git submodule init
+$ git submodule update
 $ make
 ```
 Interesting targets:
 
-* ```make bin/snake.bin``` produces .bin, ready to be burnt on an 8K EEPROM for making a cartridge (default)
-* ```make bin/snake.prg``` produces .prg for the emulator, ready to be used on tape/disk
-* ```make tape/disk``` (fastloader, to be done)
+* ```make bin/snake6502.bin``` produces .bin, ready to be burnt on an 8K EEPROM for making a cartridge
+* ```make bin/snake6502.d64``` produces .d64, ready to be used for floppy disks
 
 You can also define the following environment variables:
 
@@ -27,6 +28,10 @@ You can also define the following environment variables:
 
 ```$ VERBOSE=1 make```      output useful info during compilation
 
+## Tape
+Copy ```loader.prg``` and ```packlz``` from disk to tape.
+On a physical machine, you can use [disk2tape](https://git.giomba.it/giomba/cbmutil).
+
 ## Developer docs
 ### Package
 The whole program is assembled into a ```snake.pack``` binary blob with the following structure.

src/loader.asm

@@ -0,0 +1,60 @@
+    processor 6502
+
+    SEG.U
+    org $02
+    INCLUDE "zeropage.asm"
+
+    SEG autostart
+    org $801
+autostartRoutine SUBROUTINE
+    ; this is at $801
+    ; and it MUST be exactly at this location in order to autostart
+	; 10 SYS2060 ($80c) BASIC autostart
+    BYTE #$0b,#$08,#$0a,#$00,#$9e,#$32,#$30,#$36,#$31,#$00,#$00,#$00
+
+    ; this is at (2061 dec)=($80d)
+    ; and it MUST be exactly after the above BASIC statement
+. = $80d
+    ; load pack from tape
+    lda #(packFileNameEnd - packFileName)      ; filename length
+    ldx #<packFileName                         ; filename string address
+    ldy #>packFileName
+    jsr $ffbd                                  ; setnam
+
+    lda #$01                                   ; file nr
+    ldx $ba                                    ; last used device nr
+    ldy #$01                                   ; load to address stored in file
+    jsr $ffba                                  ; setlfs
+
+    lda #$0                                    ; load to memory
+    jsr $ffd5                                  ; load
+
+    ; address of input compressed data
+    lda #$00
+    sta srcPointer
+    lda #$80
+    sta srcPointer + 1
+
+    ; address of output decompressed data
+    lda #$00
+    sta dstPointer
+    lda #$10
+    sta dstPointer + 1
+
+    jsr inflate
+
+    jmp $2800
+
+    ; decompression util
+    INCLUDE "lzgmini.asm"
+
+;   DATA
+; -------------------------------------
+packFileName:
+    BYTE "PACKLZ"
+packFileNameEnd:
+
+#if VERBOSE = 1
+    ECHO "PRG SIZE:",(. - $801),"=",[(. - $801)d]
+#endif
+