-
Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…
... $18
62011 Loop1: LD C,$00 ; Repeat Loop2 256 times ... byte $2C
62018 DEC C ; Next iteration of Loop2 $0D ... JP NZ,Loop2 ; Loop if C not zero $C2 (62016) $40 ... $3A $30 $F2
62028 XOR A ; Invert bit pattern $AF ... -
Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…
... $00 $40
62009 LD C,$18 ; Repeat Loop1 24 times ... $3A $30 $F2
62026 XOR A ; Invert bit pattern $AF ... $30 $F2
62030 DEC C ; Next iteration of Loop1 $0D ... JR NZ,Loop1 ; Loop if C not zero $20 (-22 Bytes ... -
Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…
... might work better on compiled C code, as part of an ... instructions later there is a XOR A and there's nothing ... -
How to turn OFF the "ULA Plus"??Hi. We've made a platform-game for 128k. While testing it on 2 machines with ULA+ we have noticed the colours are crap. Can You suggest h…
... ; mode select.
out (c),a ; set ULAplus mode.
xor a ; mode off.
... out (c),a ; switch off ULAplus.
Proportional fontsI've been doing some proportional font drawing, purely on C level at the moment, but it's orders of magnitude slower than I'd want it to be. It's sti…
... )
ld l,d
xor (hl)
and #F0
xor (hl)
ld (bc),a< ... br /> inc c
... ;the above is ... h
exa
ld c,a
inc b
Flicker-free animationTrying to create flicker-free screen update, but... Where I'm wrong? [url="https://dl.dropboxusercontent.com/s/pfywhfejfmwt2zq/test_128.sna"]Snaps…
... :
ld a, 0x17
xor %1010
ld (swap_video+1 ... /> ld bc, BANKS
out (c), a
ret
ld bc, BANKS
out (c), a
ret
Graphics program in AssemblyHi so I think I'm getting the hang of this so I've done this program. It writes directly to the screen. I'm using ZX Spin. [code] LD HL,16384 LD B,…
... A>255 THEN...
XOR A ; LET A =0 : ENDIF ... /> LD A,B
OR C
JR NZ,Loop
Communal Project for ASM NewbiesHi Folks, I tend to learn best by trying stuff and then going through the pain of it not working so that I can research and fix mistakes. I suspec…
... player 1
LD C,H ;1/4 - C = Player 1 height ... the next row
DEC C ;1/4 - Counting down the ... we need to draw
XOR A ;1/4 - Set A ...RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... /> inc hl
ld c, (hl) ; attrib = * ... jr nz, paint_skip
xor a ; col = 0;
ld (ix+0), c ; *(p+delta[col]) = ...Code optimisation! 16bit number to 5 digit stringJust for interest this one, any thoughts on how to make this as fast as possible? Little optimisations to this routine or a complete reimagining? …
... /> [code];Inputs:
; C unsigned integer
;Outputs:
bBinBCD:
xor a
ld b,8 ... /> djnz nbit
rl c
ret
[/code ... ; B, C = 0
; 29 bytes, 801cc
wBinBCD:
xor a ...Code optimisation! 16bit number to 5 digit stringJust for interest this one, any thoughts on how to make this as fast as possible? Little optimisations to this routine or a complete reimagining? …
... /> ; B, C = 0
; 29 bytes, 801cc
wBinBCD:
xor a ... ,h ; a h
dec c
jr nz,nl
C
[code];Input: HL ...
ld b,16
xor a
add hl,hl ...Code optimisation! 16bit number to 5 digit stringJust for interest this one, any thoughts on how to make this as fast as possible? Little optimisations to this routine or a complete reimagining? …
... dabble
;Inputs:
; C unsigned integer
;Outputs:
bBinBCD:
xor a
ld b,8 ... br /> djnz nbit
rl c
ret[/code]
[ ... /> Another way to save C register usage, and get a ...ZX GameDev tools consolidatedHello WoS! It's been a while, yet with a plenty of decent gamedev tools (including new ones!), is there a [i]single/pivot table[/i] or some datash…
... script-based language and underlying C compiler to make the ... be any type (mask, or, xor, load). The model is sprites ... underlying tool, an ansi C compiler with linker/librarian assembler ... which supports easy mixing of C and asm, comprehensive libraries written ...Akalabeth gamei found now that someone ported an ansi-basic game (coded in 1979?) to msx-basic - what about a zx-spectrum basic version of it? ;) https://plus.goo…
... /> PLOTs: push hl
ld c,(ix+1)
ld b ... e,a
ld c,a
xor a
ld b ...Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... e,l
ib_lp0:
xor a
ld (hl),a ... /> ld (hl),a
inc c
dec l
inc ...c64 .sid player coming soon to specy 128!!!c64 .sid player coming soon to specy 128!!! the first old version uses only square waves, 4 years ago: https://www.youtube.com/watch?v=6CKt9noxA7s…
... bc,#FFFD
xor a
out (c),a ;select AY ... b,#BF
out (c),h ;try writing stuff to ... br /> .AY_found
out (c),l ;select "AY register 16 ... exist)
in a,(c) ;and try reading it ...A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
... )
inc e
xor (hl)
ld (hl),a ... back in L
jr c,nsl_shift_done ;if ADD A,$20 ... />
ld a,(hl)
xor d
ld (hl),a ... back in L
jr c,msl_shift_done ;if ADD A,$20 ...A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
... />
ld a,(hl)
xor d
ld (hl),a ...
ld a,(hl)
xor e
ld (hl),a ... back in L
jr c,msl_shift_done ;if ADD A,$20 ...Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... af
and c ;
ld ... /> set_counters:
xor a
rld ...
dec c ;DEC C overlay counter
Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... af'
and c ;
ld ... /> set_counters:
xor a
rld ...
dec c ;DEC C overlay counter
Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... ,get_data ;
dec c ;DEC C overlay counter
jr nz ... ?
put_bit:
cpl
xor (hl)
and e
Copying a single character from one place to another?[code] ORG 33000 LD A,8 LD HL,16384 LD BC,256 LD DE, 18432 LOOP: PUSH AF LD A,(HL) LD (DE),A ADD HL, BC POP AF DEC A JR NZ,LOOP REST […
... for such instructions as "OUT (c), a", the port number is ... C - but the value in B ... supports | for OR and ^ for XOR, or you can use the ... words AND / OR / XOR.
The conditions you ...Recently broken links???We all know that most WoS archive files are inaccessible, except for tapes, snapshots and screenshots. However even those started disappearing rec…
... /pub/sinclair/games-info/x/XOR.txt
/pub/sinclair/games ... /pub/sinclair/screens/in-game/c/Codebreaker.gif
/pub/ ... /pub/sinclair/screens/in-game/c/CowboyShootout.gif
/pub/ ... sinclair/screens/in-game/c/CowboyShootOut.gif
/pub/ ...ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…
... back to attr space
xor d
rra ; 4t
[code]
ld c,(hl) ; 7t - get col check ...ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…
... offset+length copy
jr c,_ulzfa010 ; 12/7t - ... copy routine
ld c,a ; 4t - store ... pos)
ld a,c ; 4t - bring back ... mem space?
jr c,_ulzfa070 ; 12/7t - ...
rlca ; 4t
xor %10000010 ; 7t
ld d ...ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…
...
rlca ; 4t
xor %10000010 ; 7t
ld d ... unsigned char *s,unsigned char **c);
int ... (unsigned char *s,unsigned char **c) {
rr pos;
}
}
*c=s+pos.rr;
return ...ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…
... jr c,_uclzf120
rlca
rlca
rlca
xor 130 ...
ret nz
xor d
rra
... jr c,_uclzf120
rlca
rlca
rlca
xor 130 ... jr c,_uclzf120
rlca
rlca
rlca
xor 130 ...Super Wonder Boy antimultiface[url="http://bizzley.com/"]Bob Pape's book[/url] mentioned that Rob Hylands put Multiface protection in Super Wonder Boy. The program can detect whe…
...
JR NZ,LFB85
XOR A
LD L,A ... /> DEC DE
LD A,C
LDDR[/code]
