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Need help with keyboard scanning ?After getting frustrated with learning ASM for a while I'm back into it. The little listing below is using the ROM's PRINT AT routine to draw me a sp…
... .
[code]
LD HL, UDG
LD (23675),HL
LD A,2
MAIN:
CALL DRAW
LD A,(INKEY)
CP 13 ... -
Other than using attributes what other ways to detect collisions, when using char based movement?So I'm slowly working out the bits and pieces to write a game completely in assembly. I've been using attributes when writing in BASIC to detect whet…
... think?
[code]
ld hl,22528
ld a,10 ; This the ... row number
ld bc,10; This is the ... bc
ld bc,32
LOOP:
add hl,bc
pop bc
add hl,bc
ld a,(hl) ; a now holds ... -
Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
... official paging port
ld hl,$c100 ; address in upper page ... change to page 0
ld (hl),c ; write test byte< ... upper 2 bits ignored)
ld (hl),l ; write new byte< ... change to page 0
ld a,(hl) ; read byte
... -
No-tearing (“vsync”) Full Screen FadeSeeing as most screen fades exhibit visible tearing, I wrote my own routine which does away with that problem. Simple, effective, short, and fully re…
... of seven colors
fade0 ld hl,$5800 ;beginning of attr area ... beam
fade1 ld a,(hl) ;read attr into A
f1 ld a,(hl) ;reload A with attr
ld (hl),a ;write attr
inc ... -
Prportional Ascii text scrollerA couple of years ago I wrote a little scroller that nestles at the top of RAM (FFCA - 65482) and scrolls standard Ascii encoded text from anywhere y…
... ld hl,0fe92h ;character set-1
ld c,(hl) ... ;counter into C
push hl ;save HL
print:
ld ... />
ld (hl),b ;reset counter< ... -
Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…
... /> add hl,de
ld e,(hl)
inc hl
ld b,(hl)
ld a ... /> ld h, #0x00
add hl, hl
add hl, hl
add hl, hl
ld e ... ,-4 (ix)
ld d ... -
Printing text using direct screen addressingHaving some problems printing using the FASE engine which is currently defeating me. Hoping to have someone clear out the bit of fog currently dwell…
Having some problems printing using the FASE engine which is currently defeating me. Hoping to have someone clear out the bit of fog currently dwelling in my brain for this function. I'm trying to get the text working properly in 128k mode which uses ... -
Help With infinite music on 128KHi :) I'm trying to play infinite simple music on 128K , but i don't know what is wrong with the loop I tried this routine but doesn't work I…
... /> ld hl,$FEFF
ld (hl),lowRSI
inc hl
ld (hl), hiRSI
ld a ... ,$FE
ld ...
inc hl
inc hl
ld (pos),hl
ei
Is it possible to run a single BASIC line via a ROM CALL of the Standard ZX 48k ROM?On: https://cygnus.speccy.cz/popis_trdos-assembler.php I found the following code: [code] CHADD equ 23645 ; Location of SOS variable CHADD ld…
... /> ld hl,(CHADD) ; Start to save true CHADD
ld (TEMP),HL ; ... of true CHADD
ld HL,SAVE ; Address of SAVE ... called
ld HL,(CHADD)
ld (TEMP),HL ; The routine ... /> call 15619
BACK ld HL,(TEMP) ; Start to restore ...No AY sound from online emulatorsI've writing an app that makes sound using the AY. I have a simple update mechanism that works like this: 1. During a frame, I write values to a b…
... /> do_update_ay
ld hl,ay_regs
ld d,0
ld c,LOW(AYCTRL ... /> out (c),d
ld e,(hl)
ld b,HIGH(AYDATA)
out (c),e
inc hl ...why am i getting b integer out of range in this code?ive tried running this in spin but thats what i get [code]main org 40000; ; We want a black screen. ld a,71 ; white ink (7) on black paper (0…
... /> ; Set up the graphics.
ld hl,blocks ; address of user-defined ... /> ld hl,21+15*256 ; load hl pair with starting coords.
ld (plx),hl ... location.
inc hl ; Increment pointer.
ld (seed),hl
ret
this code wont give me a random starfieldim using a peice of code that ive copied from a book, ignore most of it as it is redundant. for some reason i get a strange random starfield instead …
... /> ; Set up the graphics.
ld hl,blocks ; address of user-defined ... .
ld hl,3861 ; load hl pair with starting coords.
ld (plx),hl ; set ... location.
inc hl ; Increment pointer.
ld (seed),hl
ret
type in to learn about IM2I'm trying to mess around with learning about IM2 and I found a nice little article in Sinclair User September 1988, issue 78, Page 70-71 [url="https…
... /> ld ($fdfd), A
ld HL, INT_ROUTINE ;;different
ld ($fdfe), HL
ld HL, FIFTIES
ld (HL ... /> ld H, 0
add HL, HL
add HL, HL
add HL, HL
ld A ...Textured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…
Pity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the ZX Spectrum 48K. It was for a text/graphic adventure I'm working on. The algorithm is based on [url="http ...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…
...
ld l, a
add hl, hl
add hl, hl
add hl, hl ; HL = char ... /> .ok
ld (scr_out_row), hl
ld de, cursor_row
ld hl, scr_out_row
ldi ...Calling all coding munkeez...Having spent the last 8 years as a Windows application developer I thought I'd try my hand at a bit of Z80 speccy coding - something I missed out on …
... /> Like
LD HL,16384
LD A,(HL)
must work ... like this:
LD HL,16384
LD ... A,(HL+higherload)ZX48k terminal...Hello everybody, I thought someone might help me. I connect my good old ZX48k to my PC via serial (IF1) link, and I was trying to write a little term…
... :
ld hl,MyReader
ld (HD_11),hl
rst 08
MyReader:
ld hl,SER_FL
ld a,(hl)
and a< ... amp;0B98
inc hl
ld a,(hl)
scf
...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... ;restaurar
ld bc,(tempbc)
ld hl,(temphl)
LD A,C ;
or_pixel: ex de,hl
or (hl)
ld (hl),a
line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... /> ld hl,0
ld (counter),a
ld a,&xx
ld i ... program--
ld hl,(counter)
ld bc,hl
ret
ld hl,(counter)
inc hl
ld (counter),hl
ei ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... restaurar
ld bc,(tempbc)
ld hl,(temphl)
LD A,C < ... ld h,(hl)
ld l,a
ld a,(de)
or (hl)
ld (hl ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... /> 7 ld h,(hl)
4 ld l,a
7 ld a,(de ... )
7 or (hl)
7 ld (hl),a
10 pop ... /> 7 ld h,(hl)
4 ld l,a
7 ld a,(bc ... )
7 or (hl)
7 ld (hl),a
20 ld ...
