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Krakatoa not workingI can't get any of the Krakatoa files in the archive to load on spin or zxds. Anyone else had this problem?
... , the loader gets a 16383 bytes-long headerless block and then ... or synchs) longer than 31 bytes each and with pauses in ... routine is the ROM one (LD-DEC).
The data itself ... -
Krakatoa not workingI can't get any of the Krakatoa files in the archive to load on spin or zxds. Anyone else had this problem?
... /> 5B23 LD B,10 ;16 attempts to load enough bytes for this ... counter2
5B26 LD E,9F ;10011111 (159) bytes to load, max ... /> 5B2A CALL 05C5 ;LD-DEC+1, load bytes with ROM timings, overwrite ... ROM
5B2D LD A,0C ... -
128k multicolour graphics...ok over the years I've been a fan of multicolour graphics on zx spectrum, an I clearly get that on a 48k the (8x1@2)multicolour limit stands at 18cha…
... tricky. The POP/PUSH or LD/PUSH method works because you ... stack pointer) that's another LD instruction. So every time you ... pointer, you lose another 2 bytes from either the reading or ... cut you down to 12 bytes per row.
So ... -
tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…
... the original "tiny" version (53 bytes instead of 12).
LD SP, HL ; 249 ;from m ...
POP BC ; 193
LD SP, HL ; 249
PUSH ... -
Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
...
ld h,rotation_table_to_use
ld l,0 ; sprite byte ... sprite row is zero
ld de,sprite_definition_address
... hl = sprite definition addr
ld e,(hl) ; e = current sprite ... If the tables are 256 bytes long and are aligned to ... -
Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
... br /> [CODE]draw_face ld de,16384
ld a,0
... br /> ld h,0
ld l,a
ld bc,face_sprites ... /> ld b,8
face_loop2a ld a,(hl)
ld (de ... bit :
[CODE]draw_face ld de,16384
;I' ... side to side....16 bytes in all....which means ... -
Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
... and this involves POKEing eight bytes to memory per letter, each ... rows remaining
ld b,c ; b = number of ... horizontal columns
ld l,0 ; l = sprite data ... hl = sprite definition addr
ld e,(hl) ; e = current sprite ... -
z88dk stdio fopenI'm trying to write a fcntl library, based on the p3.lib one. Looking at fopen(), it calls freopen_z88() which turns the mode string into mode and f…
... code]
fputc:
ld hl,STDIO_MSG_PUTC ; = 0, other messages ... steps of 3
ld a,'A' ; send the ... )
variable number of bytes owned by driver (filepos, ... br />
DRIVER:
ld de,microdrive_jptbl
add hl ... -
Machine code crunching soundI'm looking for a re-locatable subrountine that makes a crunching sound, no border effects(border is black). Anyone got anything suitable?
... />
[CODE]CrunchSound:ld bc,768
loop: ld a,r
dec bc
ld a,b
or c ... done this in about 100 bytes! -
Z80 Cross-assemblersI need to build some code which contains sets of routines which run at one address but are stored elsewhere. Unfortunately, neither of the assembler…
... that runs along the assembled bytes, and used for calculating ...
LD HL, MYCODE
LD DE, 0C000h
LD BC, 100h ... followed by 16370 zero bytes (or FF bytes) to get to the ...
LD HL, MYCODE
LD DE, 0C000h
LD BC, 100h ... -
Z80 Cross-assemblersI need to build some code which contains sets of routines which run at one address but are stored elsewhere. Unfortunately, neither of the assembler…
... - if there's 15 bytes worth of assembly, assembler should ... the A300-A3FF page.
ld a,(ICOUNT)
... patch: Clear title screen
ld bc,1AFFh
[/CODE]< ... that just generated 7 contiguous bytes would be useless in ... -
What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... br /> di
ld a,253
ld i,a
xor ... br /> out (254),a
ld b,128
Wait djnz ... pairs of pixel/attribute bytes (or 4 bytes) is enough to meet ... -
BREAK from GOSUBHere's another one. Just in case you wanted to break out of multiple GOSUB levels with a single command, here's a routine to do it, tested on all mod…
... ADD HL, SP ;(ERR_SP)
LD SP, HL ;from m/c ... /> DEC SP ;entry is 3 bytes
EX (SP), HL ... reset Zero flag
SETRET: LD BC,$1B76 ;$1B76 = STMT_RET
Auto generated spritesLooking around for some graphics I came across [url]http://blog.disktree.net/?p=19[/url] , one of several such pages. Need the odd 8x8 UDG or two (…
... random keypresses to generate random bytes, then mirror them, ... so 10 udgs = 80 bytes stops at the (C) ... will give all the same bytes, no good! I' ... br /> ld a,b ;want to display number of bytes generated, ... thus 8 bytes created)
xor a
ld (23560),a ...BackgroundDoes anyone know how i would create a background similar to [URL=http://imageshack.us/photo/my-images/42/backgroundmockup.png/][IMG]http://img42.ima…
... br /> [CODE]org 33000
ld hl,22528 ;point hl at ... black ink bright
ld de,22529 ;de to ... following byte
ld bc,767 ;fill whole screen ... ;#columns across
loop ld (hl),64 ;poke value ... 't I?, that makes 34 bytes.. Uhhnnn
...BackgroundDoes anyone know how i would create a background similar to [URL=http://imageshack.us/photo/my-images/42/backgroundmockup.png/][IMG]http://img42.ima…
... bytes by using LD BC,nn instead of LD B,n; LD ... LD (STK),SP
LD SP,23232
LD HL,$2020
LD ... DE,$0707
LD ... /> DJNZ L1
LD SP,(STK)
...BackgroundDoes anyone know how i would create a background similar to [URL=http://imageshack.us/photo/my-images/42/backgroundmockup.png/][IMG]http://img42.ima…
... three bytes by using LD BC,nn instead of LD B,n; LD C ... will cost you a few bytes more :razz:
The ...BackgroundDoes anyone know how i would create a background similar to [URL=http://imageshack.us/photo/my-images/42/backgroundmockup.png/][IMG]http://img42.ima…
25 bytes. [I]fill_bytes[/I] must be ... ld de,22528
ld hl,fill_bytes
ld c,(hl)
fill_screen2 ld ... b,8
ld ...BackgroundDoes anyone know how i would create a background similar to [URL=http://imageshack.us/photo/my-images/42/backgroundmockup.png/][IMG]http://img42.ima…
... />
[QUOTE=Turkwel;587894]25 bytes. [I]fill_bytes[/I] must be ... /> ld hl,fill_bytes
ld c,(hl)
fill_screen2 ld b,8
ld ...Calculating percentage..or even calculating percentage. Maths and asm I find verryyy tricky. Can anyone suggest the easiest/best way to calculate a percentage from two 1…
... br /> ;
percent ld hl,Total24
ld (hl),0
inc ... number
ld hl,Given24
ld de,GivenCopy24
ld bc,3 ... Given Amount
ld c,99
percent1 ld de,GivenCopy24+2 ... 0,0,0
;scratch bytes for Calculations[/CODE]ANN: Tipshop updated Saturday, 31 December 2011Saturday 31 December 2011 The last update of the year - Happy New Year when it comes! * GoodBoy sent in a cheat for Wacky Races. * Hippy Smith sen…
... LD SP,$FFFF
LD IX,$4000
LD DE,$3F48
LD ... reloc:
LD HL,$5E00
LD DE,$9E00
LD BC,$2000 ... as required
LD DE,table
LD BC,$9E00
LD (BC),A
JR ... 13,5,14 ;only 9 bytes on this row
...PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…
... br />
norotate:
ld b,a ; b = pixel mask ... from pixel coordinates
ld a,b ; get pixel mask ... ; OR with screen contents
ld (hl),a ; write to screen ... and Y coordinates (8-bit bytes) and shuffling them around to ...PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…
... /> [code]
ld hl,10000
ld de,9000
ld bc,8000 ...
ld c,90
ld ... b,7
ld hl,-10000
ld ... and the latter taking 4 bytes and 14 cycles). Conceptually, the ...A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…
... can do it in 23 bytes now. Wanna play? :))
LD a,1
Is ...Using ATTR detection in machine codeIs there a ROM routine that can be called that reads the ATTR value of a co-ordinate?
... different udgs
ld a,(colour)
ld (hl),a ; ... to attribute address
ld hl,22528 ;start of ... xy 0,0
ld a,(horizontalcoord) ;number 0 ... byte of hl
ld a,(vertical_coord) ;number 0 ... /> loop ld de,32 ;each row is 32 bytes apart, ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
...
ld sp, ix
pop af ; read 16 bytes
...
ld sp, iy
push hl ; write 16 bytes
push ... /> incbin "unionflag.bmp" ; 6144 bytes of in order bitmap
incbin "unionflag.atr" ; 768 bytes of attributes
org ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... faster.
[CODE]
LD (STACK),SP ;DUMPS VIRTUAL SCREEN ... IN REAL SCREEN
LD SP,$E428 ;TABLE OF DIRECTIONS ... ;IF BC REPEATS
LD SP,(STACK)
[/CODE ... all, but for putting 2 bytes in the screen with LDI ...Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
[QUOTE=climacus;595221]putting 2 bytes in the screen with LDI ... /> [code]REPT 160, line
ld sp,data + line*20
pop iy
ld sp,16384 + (line/64)*2048 ...Loading the display with data from memoryTrying to load part of the screen(4k's worth) with data from memory location 53000, I've written this routine, but it doesnt work... [I]ld b,4000 ld…
... ld bc,4000
ld de,16384
ld hl,55000
loop ld ... a,(hl)
ld ... s, 'b' only
ld a,b ;puts both b ... ld bc,4000 ;no of bytes
ld de,16384 ;destination
ld hl ...Loading the display with data from memoryTrying to load part of the screen(4k's worth) with data from memory location 53000, I've written this routine, but it doesnt work... [I]ld b,4000 ld…
[QUOTE=Rebelstar without a cause;595755]Use LDIR instead.[/QUOTE]
[CODE]
ld hl,53000 ;source
ld de,16384 ;destination
ld bc,4096 ;number of bytes to copy
ldir[/CODE]
