-
Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... of getting arguments from a function into asm seems ... br /> I have a asm rountine to print a 8x8 block
#asm
ld hl,2
add hl,sp
; skip over ... sure if there is a flag to stop this ... I may have made a mistake by passing these ... -
Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... /> #asm
ld hl,2
add hl,sp ; skip over return ... /> add a,l ; add to low byte.
ld l,a
LD (HL),E ... />
LD HL,#16384
LD A,B
ADD A,L
LD ... -
Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... /> add a,l ; add to low byte.
ld l,a
LD (HL),E ... />
LD HL,#16384
LD A,B
ADD A,L
LD ... /> ld hl,7
add hl,sp
ld d,(hl)
dec hl
LD HL,#16384
LD A,B
ADD A,L
LD ... -
Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... /> add a,l ; add to low byte.
ld l,a
ld (hl),e ... />
LD HL,16384
LD A,B
ADD A,L
LD ... -
CMWC random number generator for Z80Seeing the interest regarding the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=23070"]Xor-Shift random number generator for Z80[/URL]…
... bc,0
add hl,bc
ld a,c ; i = ( i ... />
rnd ld hl,table
ld a,(hl) ; i = ( i + 1 ... ),a
xor a
ld b,a
ld c,(hl ... -
CMWC random number generator for Z80Seeing the interest regarding the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=23070"]Xor-Shift random number generator for Z80[/URL]…
... 7
inc a
ld (hl),a
inc hl ; hl = &cy ... q[i]
add a,l
ld c,a
jr nc ... ;q[i]
add a,l
ld c,a
ld ... -
AYFX .afb files<p>I've been creating sound effects using AYFX v 0.4. How do you go about implementing these files into .asm to use in a game?</p><p>I cant make…
... when bit6 is
set, a single byte with noise period ... c,(hl)
inc hl
ld b,(hl)
add hl,bc
hl= ... every effect there could be a null terminated text
... was saved
into a file using corresponding item of ... -
Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... (HL),A
PUSH HL
LD DE,$20
ADD HL,DE
LD (HL),A ... HL
LD L,A
LD H,0
ADD HL,HL
ADD HL,HL
ADD HL,HL ... -
Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... which might render a floating point result. ... br /> DoubleHeight:
ld a,2
call $1601 ... ;CHAN-OPEN open channel A
ld ix ... ) ;DEFADD
ld a,(ix+6) ; =d$ length ... -
Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... nc,print_string
ld a,d
add a,8
ld ... HL at graphic
ld h,0
ld l,a
add hl,hl ... ;x2
add hl,hl ;x4
add hl,hl ;x8
... address here
add hl,bc ;HL now pointing at graphic
Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... /> ld h,0
add hl,hl
add hl,hl
add hl,hl ;HL=CODE d$(c)*8 ... /> inc hl
djnz LoopB
ld a,e
add a,32 ;increment ...Multiplying. Again.Is there a faster way of hl=a*32 than doing add hl,hl 6 times?<div><br></div><div>I get the feeling that working with 8 bit registers for most of it …
Is that any value in A, or is it limited?I'm pretty bad at the maths stuff but I'd be surprised if you'll do significantly better than ADD HL,HL, even with a flabby lookup table.EDIT - ooh what abour RLD?Multiplying. Again.Is there a faster way of hl=a*32 than doing add hl,hl 6 times?<div><br></div><div>I get the feeling that working with 8 bit registers for most of it …
... ,a ;4t
add hl,hl ;11t
add hl,hl ;11t
add hl,hl ;11t
add hl,hl ;11t
add hl,hl ... ;11thowsabout
xor a ;4t ...Multiplying. Again.Is there a faster way of hl=a*32 than doing add hl,hl 6 times?<div><br></div><div>I get the feeling that working with 8 bit registers for most of it …
... l,a
REPT 5
add hl,hl
ENDR
HL=A*32 ... using RLD:
ld hl ...
ld l,(hl)
ld h,a
add hl,hl
The ...Multiplying. Again.Is there a faster way of hl=a*32 than doing add hl,hl 6 times?<div><br></div><div>I get the feeling that working with 8 bit registers for most of it …
... ld l,0
or a
rra
rr ... rr l
ld h,a
Otherwise, if ... with ADD A,A's and the rest with ADD HL,HL's< ... br />
That or using a look ... h,MultTable/256
ld a,(hl)
inc h
...Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... ,a
ld de,VectorTable
add hl,de
ld a,(hl)
inc hl ...
ld h,(hl)
[code] add a,a
ld (addr+1),a
addr:
ld hl,(jump_table ...Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... ,a
ld de,VectorTable
add hl,de
ld a,(hl)
inc hl ...
ld h,(hl)
[code] add a,a
ld (addr+1),a
addr:
ld hl,(jump_table ...Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... /> ld a,(hl) ;a=1 or 2
inc a ;a=2 or ... ld a,(hl) ;a=1 or 2
dec a ;a=0 or ... a,(hl) ;a=1 or 2
cpl ;a=-2 or -3
add a,4 ;a ... /> ;Best
ld a,(hl) ;a=1 or 2
xor ...Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
...
ld e,a
add hl,de
add hl,hl
add hl,hl ; hl=a*12
; 9 ...
ld l,a ;hl=a*3
add hl,hl ;hl=a*6
add hl,hl ;
Einar Saukas
August 2015
Development
Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... a, (frame_count)
ld e, a ; Set index low byte
add hl, de ; Add ... offset to base
ld a, (hl) ; Look up ...Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... ,a
ld de,VectorTable
add hl,de
ld a,(hl)
inc hl ...
ld h,(hl)
ld a,(Number)
add a,a ; a*2 (limits Number to 128)
add a,VectorTable ...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... l,a ; char
push hl ; store hl
add hl,hl ; hl=hl*2
add hl,hl ; hl=hl*4
pop de ; de=original hl
add hl,de ; hl=hl ...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
...
REPT 5
add hl, bc ; character gfx offset = ... with screen
ld (hl), a ; store on screen
... or c
ld (hl), a
inc h
...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... a
ld d, 0
REPT 6
add hl ... , de ; * 6
ENDM
ex de, hl ; ... ld (hl), a
ld a, c
and a
...Subtract 4 from an addressThis is a novice Z80 question really: I'm trying to vertical scroll my back buffer, but I'm not sure of the quickest way to apply an offset and mo…
... the fastest possible implementation. A shorter alternative is also possible ...
ld hl,-40
add hl,sp
ld sp ... next step and implement a circular buffer as others ... decreasing the addresses before a byte is copied therefore ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... - correct for missing sbc a,' '
add hl,bc ; now hl = FONT_ADDR + 7 * ... br /> ld (hl),a ; write background color to screen
add hl,bc ; next ... br /> ld (hl),a ; write background color to screen
add hl,bc ; next ...Heavy on the magick bugsDo you know any "Heavy on the magick" bugs or glitches? As far I know cheat with realign status and not well drawn cyclops arm http://i.imgur.com/VY…
... /> [code]
ld hl, keyboard_buff
inc (hl) ;increase length
ld ... d, 0
add hl, de
ld (hl), a ;put letter to buffer ...r-type in development for the sam coupehttp://cookingcircle.co.uk/ we need z80 coders graphics artists and audio this is the amstrad cpc 6128 version: https://www.youtube.com/watc…
... A
29B2 87 ADD A,A
29B3 87 ADD A,A ;*8
29B4 83 ADD A ... /> 29BE 5E LD E,(HL) ;GET WIDTH FROM STRING ... 29C1 23 INC HL
29C2 E5 PUSH HL
... NEXT SCAN, A'=INVERSE MASK
29D5 ;HL' CAN ... WIDTH)
29E0 09 ADD HL,BC ;DROP 1 SCAN ...Games not compatible with the 128+ & grey +2Like the +2A & +3 thread, there are a few games that do not work correctly on the original 128+ and the grey +2. Two games that I know of that wil…
... /> inc hl
inc hl
type3 ld a,(hl) ; a=first byte< ... type 3
patch add hl,bc ; hl=address after jp pe< ... br /> add hl,bc ; go forward 10 bytes
ld a,(hl) ; a=value ... itself now
add hl,bc ; otherwise add another 10 so we ...Drawing some spritesI figured I want to draw some sprites. My target was to do a 16x16 masked sprite. There's no clearing here, just drawing the sprites. My first ite…
... h, 3 (iy)
add hl, bc ; add x offset
ex de ... the data
ld (de),a ; and back to screen we ... de
pop hl ;repeat
ld a, (de)
and ...
