-
Problem with DivIDEHi There is a problem on ZX-Spectrum +2 (Grey Model) + DivIDE 2k14 here is video with problem [URL="http://www.youtube.com/watch?v=nIQboFo7Epc"]h…
... ]
[CODE] ld de,#3808
i_04
ld hl,#5818
i_02 ...
ld bc,#001f
i_03
ld (hl),d
add a,a< ...
ld (hl),e
inc hl
djnz i_03
ld bc,#0018 ... -
Currah ?Speech channelIt seems to me that it would be nice to be able to send words to the ?Speech with PRINT #5;"Speak English to me, Jimmy" or some such. There really i…
... /> ld d, 0
ld e, a
add hl, de ; allophone
ld a, (hl ... ) ; get allophone
ld hl, (65362) ; address buffer
ld (hl ... -
Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
...
0x11DA LD H,D ; HL = DE (0xffff)
0x11DB LD L,E
downloop:
0x11DC LD (HL ... LD DE,3EAF
0x1206 LD BC,00A8
0x1209 EX DE,HL ; HL=3EAF, DE=FFFF ... -
Problem Reading the KeyboardHi Folks, I'm working my way through Toni Baker's rather good book and thought I'd write some code to scan the keyboard and store the results so tha…
... to copy
LD DE,_oldKeyStates ;Destination
LD HL,_currentKeyStates ;Source
LD HL,_currentKeyStates ;Where to store ... keyboard segment number
LD HL,_keyboardSegments ;Calculate the keyboard ... -
Simple text scrolling routine...I'm having trouble writing a very simple text scroller, the idea is to use the ROM printer routine to print 32 characters each time the routine is ca…
... routine is called, updating the de string start address by 1 ... new number
ld (point+2),a ;load de with new start ... /> call 5633
point ld de,dat
ld bc,32
call ...
attr
ld hl,23264
ld b,64
loop ... -
Help needed with a bit of code...My minds gone blank again I'm afraid, I'm having trouble with this routine that loads variables into memory then calls the corresponding routine. Th…
... ]ld b,3
ld hl, cor
ld de,adds
loop
ld a,(de ... )
ld (caller ... be called in de
inc de
;ld a,(hl) ;hl stores variables ... -
Pixel level collision detection[SIZE=3][FONT=Calibri]I need to do some pixel level collision detection. Assuming I have a byte of my ?player? sprite in DE and a byte of screen to t…
... in DE and a byte of screen to test in HL I ... /> [CODE]
ld a, (de)
ld b, a
xor (hl)
and ... -
Return to basic from sna created by Z80 compilerHow can I go back to basic when running sna created using Z80 Assembler ([url] http://www.worldofspectrum.org/utilities.html#crossass [/url])? For e…
... /> ld hl,16384
ld de,16385
ld bc,6143
ld a,255
ld (hl ... ),a
ldir
skok: ld a ... -
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 de,dat1
loop2
ld a,(de)
ld (char),a
push hl ... de
pop hl
inc de ld hl,x1+1
inc (hl)
ld hl ... ,x2+1
inc (hl ... -
WANTED Machinecode Routine for Paging in Betadisk TR-DOS v5 ROMI try to build a small MCode-program which writes the TR-DOS-ROM v4 / v5 to RAM adress 40000 an up. It´s working on TR-DOS v4 / Betadisk 48k: C…
... an additional PUSH HL for RET
PUSH HL ;Put the ... 40000:
LD HL, 0
LD DE, 40000
LD BC, 16384
LD C,0 ;Set DOS Routine ... 40000:
LD HL, 0
LD DE, 40000
LD BC, 16384
Mr. Jido makes some noiseA little something to analyse and discuss for you. [code] ORG 60000 ; RND Generator: RND LD HL,EARTH LD A,(WIND) ADD A,L LD …
... /> LD HL,WIND
INC (HL)
LD E,(HL)
LD HL,EARTH
ADD HL,DE
LD ... A,(HL)
LD (RANDOM ...Problem with BC corrupting after DJNZJust for fun, I'm messing around trying to get the level maps from Lemmings to display on the screen with machine code. It's been ages since I did an…
... ]
MAIN LD HL,50213 ; MAP START ADD
LD DE,16384 ; SCREEN ... START ADD
LOOP1 LD BC,8 ... THE LINE COUNTER
LD BC,32 ; SET THE COUNTER ... THE MAP ADDRESS
ADD HL,BC ; ADD 32 TO THE ...Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…
...
LD HL, FONT
LD (23606),HL
LD DE,L_35413
LD BC,00001 ... : LD A,(DE)
AND C
JR Z,L_35464
INC (HL ... H
INC DE
DJNZ L_35459
LD HL,PUNTO_A
RRC ...Add with Carry ExampleHi, I have been really struggling to understand this simple example from Mastering Machine Code and I wonder if anyone can help? I have include…
... :
[code]LD DE,3385
LD HL,7BC7
LD A,L ;A ... ;A = 7B + 33 = AE
LD L,A ;L = AE
LD H,A ;H = 4C
HL etc, then the H is ...Z88DK NOOB cplot INK colorHi I am a complete NOOB with Z88DK, I am trying to draw colored circles. How does ink, paper and border work with Z88DK. I started trying to wo…
... />
POP HL ; HL = return address
POP DE ; E = y, ... CALLEE functions)
PUSH HL ; push return address back ... /> djnz PLOTBIT
or (hl)
ld (hl),a
RET ...Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …
... /> ld hl, attrib_data
ld b, %01111000
ld de, 768
_loop:
ld (hl), b ...
inc hl
dec de
ld ...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…
... /> draw_keep:
ld hl, SCREEN
ld de, SCREEN+1
ld bc, CYCLES-1 ... /> rrc a
ld (keeper), a
ld (hl), a
ldir ...
ret
swap_video:
ld ...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]number2string: ;arrive DE number, HL at end of string,assume ... br /> jp c,cont
ld (hl),'0' ;yep,reset and do ... ,c ;HL back to start of string
dec de ;decrease ... number counter
ld a,d
How would you do a negative image ?So I want to invert a Speccy bitmap. What would be the fastest and easiest way to this ? I've been using this a lot but I can't see how I could achi…
... addresses HL to DE.
ie
LD HL, 16384
LD DE, 51444
LD BC ...Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…
... bits, simply add the instruction LD DE,(SEED+2) just
... ,$38 ;restack,end_calc
LD A,(HL) ;Fetch the exponent of ... . divide 'last value'
LD (HL),A ;by 65536 to give ... last value'.
RANDOM0:POP HL ;discard $2d2b ;STACK_BC return ...Scrolling loader counter in 85 T-States?Would it be possible to write a scrolling loader counter in 85 T-States? I have a custom screen load routine that loads attribute first, then the …
... /> ld hl,22528 ; attributes
ld de,49152 ; destination
loop2: ld (saveaa+1),hl ; ... save attribute address
ld a,(hl) ; get attribute
ld (de ... address in hl
loop1: ld a,(hl) ; get pixel
ld (de),a ; ...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…
... /> ex de,hl ;save screen address in DE
ld hl,(sprite_8x8) ;point HL to ... sprite data
ld b ... /> ex de,hl ;screen address -> HL, spite data -> DE
ld a,(hl ...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 […
...
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 ...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…
... /> ld d,(hl) ; 7t - start screen pos into de
inc hl ; 6t
ld ... /> ld a,(hl) ; 7t - get literal
inc hl ; 6t - next mem
ld (de ...
_ulzfa040:
ld a,(hl) ; 7t
ld (de),a ; 7t
call ...Mojon Twins MK2 and lighting effectsDoes anyone have any experience in getting the overlay.h working in the MK2 engine. There were several games written in the churro that used the ove…
...
add hl, de ; hl = ovl_y * 36 + ovl_x
ld de, _ovl_buff
add hl, de ; hl = _ovl_buff ...
add hl, de ; hl = ovl_y * 36 + ovl_x
ld de, _ovl_buff
add hl, de ; hl = _ovl_buff ...how does this multiplication routine work?taken from chuntey wordpress: imul ld e,d ; HL = H * D ld a,h ; make accumulator first multiplier. ld …
... /> ld hl,0 ; zeroise total.
ld d,h ; zeroise high byte so de ... =multiplier.
ld b,8 ; repeat 8 ... wasn't set.
add hl,de ; bit was set, so add ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... /> ex de,hl ;de now contains screen address hl contains array location
ld (hl),e ...
inc hl
ld (hl),d
inc hl
ex de,hl
High score table routineI wrote this general purpose high score table routine. It stores 5 scores and displays them alongside the player names, which are 8 characters long. …
... /> LD HL,THIRD
LD DE,FOURTH
LD BC,2
LDIR
LD HL, POS_3 ... /> LD HL,SECOND
LD DE,THIRD
LD BC,2
LDIR
LD HL, POS_2 ...Flood Fill IssueHi Folks, Came across the following Flood Fill routine by John Metcalf: [code]; scanline fill by John Metcalf ; call with d=x-coord, e=y-coo…
... rightedge 60039 28 0D
ld (hl),a 60041 77
... rightedge:
pop de 60054 D1
ld a,e 60055 7B ... br /> or (hl) 60083 B6
cp (hl) 60084 BE
push de 60101 D5
jp (hl) 60102 E9[/code ...
