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this code wont give me a random starfieldim using a peice of code that ive copied from a book, ignore most of it as it is redundant. for some reason i get a strange random starfield instead …
... br /> ; . . . . . . . . . . .
;
GETRND LD BC,(SEED) ; Modified version of ... defb $41
defb $00,$00,$80
defb $32 ; ... FPTOBC
LD (SEED),BC
LD A,(HL)
LD (HL),A
... -
Arkanoid / Batty clones ?Although there is an old 2008 topic [url="https://worldofspectrum.org/forums/discussion/16532/best-worst-arkanoid-clones/"]here[/url] , I felt a new …
... /> [code]
$BB39 $CD $00 $5D call $5D00 ; redirect
$5D00 $21 $00 $04 ld hl, $0400 ; delay time
$5D04 $7C ld a,h
$5D05 ... $DD $21 $54 $9B ld ix,$9B54 ; original overwritten command ... -
Dynamite Dan II - Island 6 - HELP!Hi all, can someone possibly create a snapshot of Island 6 (car park island) on Dynamite Dan II for me please? I'm trying to work out why half the…
...
checkpauseon: ld a, $df
in a, ($fe)
rra
checkquit: ld a, $fb
in a, ($fe)
rra
checkpauseoff: ld a, $df
in a, ($fe)
rra
Dynamite Dan II - Island 6 - HELP!Hi all, can someone possibly create a snapshot of Island 6 (car park island) on Dynamite Dan II for me please? I'm trying to work out why half the…
... loader
ld ix,26367
ld de,38910
ld a,255 ...
out ($fe),a ; BORDER 0
print: ld a,1 ... 1
ld a,$f7
in a,($fe)
bit 0 ... 6
ld a,$ef
in a,($fe)
bit 4 ...Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…
... org 32768
ld hl, 16384 ; 10
ld b, 8 ; ... lp: xor a ; 4
ld c, (hl) ; 7
write: ld (hl), a ; 7
... is $ff or $00 and skipping mirroring, might ... org 32768
ld hl, $4000 ; 10
ld d, $c0 ...Prefered Tools for Developing Maching Code in 2021I am considering this year to fulfill my goal of actually writing machine code programs for the ZX Spectrum. I am an accomplished object oriented cod…
... is correct my instruction [b]ld bc, 10[/b] is ... BC, but the other LD commands for other registers are ... wrong address. The opcode for LD BC,** is 01. The ... this:
01 0A 00
If you ... is the opcode for the LD A,(BC) instruction. Since ...Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…
... to check
LD C,&FE ; C is always ... /> Read_Keyboard_0:
LD B,(HL) ; Get the ... to check
LD C,&FE ; C is ... to check
LD C,&FE ; C is ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... supply
ld ix, spr_8x8
ld hl, txt_air
ld (ix+2 ... 23
ld hl, checkerboard
ld (ix), hl
ld(ix+2 ... press a
ld a, #fd
in a, (#fe)
bit ... /> text_out:
ld a, (hl)
ld e, a
ld d, 0 ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... br /> airloop ld ix, spr_8x8
ld hl, txt_air
ld (ix+2 ...
ld ix, spr_8x8
ld hl, txt_air
ld (ix+2 ... press a
ld a, #fd
in a, (#fe)
bit ... text_out:
ld a, (hl)
ld e, a
ld d, 0 ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... br /> ld ix, spr_8x8
ld hl, txt_air
ld (ix+ ... a
ld a, #fd
in a, (#fe)
... /> text_out:
ld e, (hl)
ld d, 0
... br /> ld b, 8
ld e, (ix)
ld d, ... to be
ld e, (hl)
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... [code]
ld de, gfx16x16_ball
ld c, 5 ; ... #00, #00, #00, #00, #00, #00, #00, #00
db #00, #00, #00, #00, #00, #00, #00, #00
db #00, #00, #00, #00, #
Paradigm Shifter
June 2022
Development
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... br /> airloop ld ix, spr_8x8
ld hl, txt_air
ld (ix+2 ...
ld ix, spr_8x8
ld hl, txt_air
ld (ix+2 ... press a
ld a, #fd
in a, (#fe)
bit ... text_out:
ld a, (hl)
ld e, a
ld d, 0 ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... ld ix, spr_8x8
ld hl, txt_air
ld (ix+2), a
ld ... 23
ld hl, checkerboard
ld (ix+0), ... br /> ld a, #fd
in a, (#fe)
... br /> ld a, (hl)
ld e, a
ld d, ... add hl, hl
ld de, FONTBASE
add ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... ld ix, spr_8x8
ld hl, txt_air
ld (ix+2), a
ld ... press a
ld a, #fd
in a, (#fe)
bit ... /> ret
text_out:
ld a,31
cp (ix ... ,cltoe31
ld a, (hl)
ld e, a
ld d, 0 ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... CHECK BEFORE CALLING text_out
ld a, (ix+3)
ld hl, checkerboard
ld (ix+0), l ... a
ld a, #fd
in a, (#fe)
... about CP instruction
;ld a,31
;cp ... br /> ld a, (hl)
ld e, a
ld d, ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... BEFORE CALLING text_out
ld a, (ix+3)
ld a,5
ld b,23
ld c, ... call setattrib
ld hl, checkerboard
ld (ix+0), l ... a
ld a, #fd
in a, (#fe)
... br /> ld a, (hl)
ld e, a
ld d, ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... ; B
; ld a, port
; in a, (#FE)
; to do ... press space
ld a, #7F
in a, (#FE)
bit ... pressing W?
ld a, #FB
in a, (#FE)
bit ... or D?
ld a, #FD
in a, (#FE)
bit ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... br /> IF RETURN_TO_BASIC
ld (stashed_iy), iy
... exx
ld (stashed_hl_alt), hl
ENDIF ... IF STRIPES
ld c, 12
ld hl, ATTRIBS
.next2rows
ld b, 32
ld ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... register
ld a, r
ld l, a
;ld hl, #315a ... /> ENDIF
IF RETURN_TO_BASIC
ld (stashed_iy), iy
exx
IF STRIPES
ld c, 12
ld hl, ATTRIBS
.next2rows ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... ; B
; ld a, port
; in a, (#FE)
; to do ... press space
ld a, #7F
in a, (#FE)
bit ... pressing W?
ld a, #FB
in a, (#FE)
bit ... pressing I?
ld a, #DF
in a, (#FE)
bit ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... , #CC, #FF, #CC, #CC, #CF, #00 ; AE
; in data ... main
[code]
ld hl, thanks_str
call puts ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... tags
TAG_NIL EQU #00
TAG_INT16 EQU # ... br /> ld (input_buff), a
ld (input_buff_cursor), a
ld (input_buff_len ...
pop hl
ld (hl), 0
jr ... jr z, hltodecimal
ld a, '-'
ld (de), a
...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... tags
TAG_NIL EQU #00
TAG_TRUE EQU # ... /> [code]
maketrueobj:
ld hl, str_true
call puts ... />
makenilobj:
ld hl, str_nil
call puts ... string
intrinsic_lookup:
ld de, intrinsics
. ...ZX32 HelpI've been using the brilliant ZX32 version 2.00.04.04 ( Beta ) for a while now with no problems. However this week after my machine running win 95 cr…
... the brilliant ZX32 version 2.00.04.04 ( Beta ) for a ...Little problem with AYmakeWell, I'm not sure if this post may be here, but, if I'm wrong, I'm sorry. I have a little problem using aymake. I want to convert a 48k's song, w…
... tried many ways:
Areg=#00 #22 #44
Areg=#002244 ...
Areg=#00,#22,#44
(The ...ZX-2-PC Interface continue...A couple of months ago I started to built an interface for less then ? 5,00 which should communicate to the PC on a high speed. Yesterday I managed t…
... interface for less then ? 5,00 which should communicate to the ...
