z88dk forums

Thank you!!!

OK, thanks!

I just finished implementing a BIFROST*2 interface library for z88dk. It's available for download from directory "_Z88DK" here:

https://www.dropbox.com/sh/bgtoq6tdwrop ... 6dLJZfGASa

Could you please incorporate it into the z88dk repository? Thanks!

Thanks a lot for the info!

Properly choosing compile parameter "-startup" is very important to minimize program size. This parameter chooses CRT, which means memory model and devices attached to stdin, stdout, stderr. According to wiki page http://www.z88dk.org/wiki/doku.php?id=temp:front and thread http://www.z88dk...

Thanks!

Further testing indicates the mask to set PAPER (while preserving INK) is probably wrong. It's supposed to reset attribute bits 3,4,5 only, but it's apparently resetting bit 2 too.

Take this test program: #include <stdio.h> #include <arch/zx.h> #define printInk(k) printf("\x10%c", (k)) #define printPaper(k) printf("\x11%c", (k)) #define printAt(row, col) printf("\x16%c%c", (col), (row)) main() { zx_border(0); zx_cls(0); printInk(0); /* black */ pr...

Thanks!

Thanks!

Sample file "z88dk/libsrc/_DEVELOPMENT/EXAMPLES/zx/demo_nirvanap/nirvanadem.c" contains the following definition: #define printAt(row, col) printf("\x16%c%c", col<<1, row) Sample file "z88dk/libsrc/_DEVELOPMENT/EXAMPLES/zx/demo_nirvanam/nirvanadem.c" contains the follow...

When I try to compile example file "z88dk/libsrc/_DEVELOPMENT/EXAMPLES/zx/demo_nirvanap/nirvanadem.c" (from latest z88dk distribution), I get the following error: > zcc +zx -vn -startup=1 -clib=new nirvanadem.c btile.asm -o nirvanadem Key to filenames: s7p8_.o = nirvanadem.c s7p8_1.o = bti...

Thanks!

File "nirvana-.h" revision 1.2 line 198 has an incorrect define (missing function name). Please take a look!

I improved ZX7 documentation again. There are now more detailed technical notes describing the algorithm behavior in terms of a more generic sliding window size w<n (although ZX7 implementation uses a fixed sliding window size). This information will be more useful for people that care about the the...

Thanks!

... and I just realized a mistake I made in the documentation. Fixed now, can you please update it again?

Sorry!!!

BTW latest version is available from here, as usual:

https://www.dropbox.com/sh/bgtoq6tdwrop ... 6dLJZfGASa

I updated ZX7 documentation to add some extra information. Could you please update file "zx7.txt" in z88dk repository? Thank you!

I reimplemented most of this game logic in optimized Assembly, for comparison. I just left the main execution flow coded in high level language, because I'm going to add more features now, so there's no point optimizing code that will be changed soon. This new, mostly optimized Assembly version now ...

Yet another sample program test.c : unsigned char counter = 7; void func() { counter = 11; } main() { func(); } Now generated code for function func() is as follows: ._func ld hl,11 % 256 ;const ld a,l ld (_counter),a ret Comment: 1.) When assigning a constant expression to a variable, it would be m...

Another sample program test.c : unsigned char counter = 7; void func(unsigned char i) { if (i == 1) ++counter; if (i == 2) --counter; } main() { func(0); } This time, generated code for function func() was worse: ld hl,2 ;const add hl,sp ld a,(hl) ; A = i; cp #(1 % 256) ; if (i == 1) jp nz,i_4 ld hl...

Sample program test.c : unsigned char counter = 7; void func(unsigned char i) { if (i == 1) counter++; if (i == 2) counter--; } main() { func(0); } Compile options: zcc +zx -vn -startup=31 -clib=new test.c -O3 -a The following code will be generated by z88dk-win32-20151215.zip for function func() : ...

Thanks for your detailed tips! I will try sdcc later.

In the meantime, I checked the compiled code and noticed a few oportunities for optimizations. I will start separate threads to report my findings.

Adding "-Cl--split-bin" to the compile line produces the following files: 1 game_BSS.bin 30 game_bss_compiler.bin 2 game_bss_error.bin 2 game_bss_stdlib.bin 3 game_CODE.bin 36 game_code_arch.bin 13 game_code_bifrost_h.bin 2,332 game_code_compiler.bin 118 game_code_compress_zx7.bin 3 game_c...