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| author | B. Watson <yalhcru@gmail.com> | 2016-02-18 05:26:21 -0500 |
|---|---|---|
| committer | B. Watson <yalhcru@gmail.com> | 2016-02-18 05:26:21 -0500 |
| commit | 112ed11473e4be6fadf8f1abad08195294e838f4 (patch) | |
| tree | ca6aa40ee05a20fdccd416de1e6b218108ea067c | |
| parent | 7759a52eb0ee980efd8a1d9faa1c84af1db1368c (diff) | |
| download | taipan-112ed11473e4be6fadf8f1abad08195294e838f4.tar.gz | |
save a byte in the cart build
| -rw-r--r-- | Makefile | 18 | ||||
| -rw-r--r-- | crt0_cart.s | 11 |
2 files changed, 10 insertions, 19 deletions
@@ -303,21 +303,11 @@ mkcart: mkcart.c $(HOSTCC) $(HOSTCFLAGS) -o mkcart mkcart.c # cc65 doc atari.html explains how to produce a raw binary file. -# we build it for $03ff because cc65-produced atari binaries always -# have an RTS as the first byte (for compatibility with SpartaDOS). -# the "tail -c+2" stuff removes the first byte, so we end up with -# a romable_taimain.raw that's ready to be copied to $0400 and run -# via "JSR $0400". -#romable_taimain.raw: $(TAIMAIN_C_SRC) $(TAIMAIN_ASM_SRC) $(TAIMAIN_HDRS) -# rm -f taimain.xex -# $(MAKE) FONT_ADDR=0x9c00 TAIMAIN_ADDR=0x3ff EXTRACFLAGS="-Wl -D__AUTOSTART__=1 -Wl -D__EXEHDR__=1 -DCART_TARGET=1 --asm-define CART_TARGET=1" taimain.xex -# tail -c+2 taimain.xex > romable_taimain.raw -# rm -f taimain.xex - +# using a custom crt0 to get rid of the extra RTS cc65 puts there for +# SpartaDOS compatibility (which has no effect on a cartridge image, +# except to waste 1 byte). romable_taimain.raw: $(TAIMAIN_C_SRC) $(TAIMAIN_ASM_SRC) $(TAIMAIN_HDRS) $(BIGNUM_SRC) $(BIGNUM_HDRS) $(TAIMAIN_LIBS) crt0_cart.s - cl65 --config cartbank3.cfg -m taipan.map -t atari -T -I. -L. -DFONT_ADDR=0x9c00 --start-addr 0x3ff -Wl -D__STACKSIZE__=0x200 -O -Wl -D__SYSTEM_CHECK__=1 -Wl -D__AUTOSTART__=1 -Wl -D__EXEHDR__=1 -DCART_TARGET=1 --asm-define CART_TARGET=1 -DBIGNUM=BIGFLOAT -o romable_taimain.raw.in $(TAIMAIN_C_SRC) $(TAIMAIN_ASM_SRC) $(BIGNUM_SRC) $(TAIMAIN_LIBS) crt0_cart.s - tail -c+2 romable_taimain.raw.in > romable_taimain.raw - rm -f romable_taimain.raw.in + cl65 --config cartbank3.cfg -m taipan.map -t atari -T -I. -L. -DFONT_ADDR=0x9c00 --start-addr 0x400 -Wl -D__STACKSIZE__=0x200 -O -Wl -D__SYSTEM_CHECK__=1 -Wl -D__AUTOSTART__=1 -Wl -D__EXEHDR__=1 -DCART_TARGET=1 --asm-define CART_TARGET=1 -DBIGNUM=BIGFLOAT -o romable_taimain.raw $(TAIMAIN_C_SRC) $(TAIMAIN_ASM_SRC) $(BIGNUM_SRC) $(TAIMAIN_LIBS) crt0_cart.s # 256 bytes of $ff filler, for the last page of each code bank. Wasting # this little bit of space simplifies the copying code in bank7.s (no diff --git a/crt0_cart.s b/crt0_cart.s index ec3e423..7448e9b 100644 --- a/crt0_cart.s +++ b/crt0_cart.s @@ -8,6 +8,12 @@ ; Stefan Haubenthal ; +; Modified for use with Taipan cartridge image: +; - Removed the RTS at the start of the code +; - Got rid of __ATARIXL__ conditionals +; - Don't save stuff like APPMHI and LMARGN, since the cart +; never returns. + .export __STARTUP__ : absolute = 1 ; Mark as startup .export _exit, start @@ -22,11 +28,6 @@ .segment "STARTUP" - rts ; fix for SpartaDOS / OS/A+ - ; They first call the entry point from AUTOSTRT; and - ; then, the load address (this rts here). - ; We point AUTOSTRT directly after the rts. - ; Real entry point: start: |