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multi-scroll m/c subroutine for BASICArising from recent posts, here's a scrolling routine that will manage multiple left/right scrollings for any (sensible) line width or step; (ie. whe…
Arising from recent posts, here's a scrolling routine that will manage multiple left/right scrollings for any (sensible) line width or step; (ie. where width is -
I like smileys ... but what's this one about?The last few years I've noticed on some webpages an itty, bitty, tiny little, very specific smiley-face which doesn't seem to serve any purpose. Asi…
The last few years I've noticed on ... being [I]just[/I] a smiley, does it serve a known webomologically ... technical purpose?
Look! THERE IT IS!!! [I ... ]RIGHT[/I] there!!!!!!!
calculator and sinusok, look at the Sysel's routine: [PHP]3 5b00 *s 4 5b00 tabsin = #7000 03 mksin 19.11.1995 Busy soft …
... /> 6 8000 fd213a5c p ld iy,#5c3a Systemky musia byt ... br /> 9 8007 7d mksn1 ld a,l
10 8008 ... br /> 24 8020 77 ld (hl),a
25 8021 2c ... :0 [/PHP]
I do not understand how to ...Graph Plothi! please, help with code: [PHP]For x=-100 To 100 For y=-100 To 100 If (x/2-25)*(x/2-25)+(y-50)*(y-50)<200 Or (x/2+25)*(x/2+25)+(y-50)*(y-50)<200 th…
hi! please, help with code:
[PHP]For x=-100 To 100
For y=-100 To 100
If (x/2-25)*(x/2-25)+(y-50)*(y-50)Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... nc, exo_get4bits
ld (iy+0), c ;bits[i]=b1
push ... a, a
ret nz
ld a, (hl)
inc hl
adc a, a ... AF' register pair.
I am talking about simple and ...Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …
... Graph Plot" thread, I wrote this general purpose ... , try as I might I can't get ... a
sla a ;A =A*8
add a,198
ld (SETPIXL+1),a
ld a ... /> ---
"But why? - I don't understand - Whose mind ...checksum routine from Space GunThis routine starts off with HL=$ffff and a file header read from tape, for each byte of which in turn it assigns to A and calls this routine, ending…
... $0f :
LD E,A : LD A,L : XOR B :
LD H,A : LD A,E : XOR ... : RLA :
LD B,A : RLCA : AND $01 :
LD E,A : LD A,B : XOR ... H : XOR E
LD H,A : LD A,B ... C
LD L,A : RET
[/code]
So I presume …need some help with a small programHi you all, maybe someone can quickly help me on this small program, I just did a really small program for a presentation, I want the letters to ch…
... program, I just did a really small program for a presentation, I want ... its enough anyway but I kind of want it working ... planned.
program i wrote like this, workes fine ... i=1 to 6 step 1
120 let a$=" ... print at 9,11; ink i; a$;
150 print at ...How do you restrict this routines actions?I'm trying to plagiarise a piece of code I came across in the 80's, but seem to be banging my head against a brick wall! The routine fades the scree…
... fades the screen, but I am only wantin to ... much of it, so I have altered the line ... br /> The only problem is I cant seem to work out ... (768 bytes).
I only want to fade 672 ... a
l_b7c9: ld a, b
l_b7ca: ld (hl), a
inc hl
ld a ...Trouble with rainbow effect push/popI'm having a bit of bother getting my rainbow graphics to behave themselves. Basically I want a rainbow effect to last for say 4 seconds before movi…
I'm having a bit of bother getting ... .
Basically I want a rainbow effect to last for ... , the problem is if I omit push and pop bc ... an endless loop, if I include it the rainbow effect ... a
LD B, 2
LD DE, 23150
lp2 LD (DE), A< ...Machine code assistance please #1Dear all, Learning the ropes here, so please excuse these odd questions which may seem simplistic to you learned lot. This routine is placed at 33…
... ld l,155
ld c,200
ld a,c
add a ... ,l
ld c,a ...
ret
[/code]
When I ... add at the beginning, the following...
[code]
ld ... hl,0
ld bc,0
Struggling with this routine... Any ideas?I'm trying to write a routine that plots 3 pixels to decrease the energy bar in the top right corner by 5 units, but it just wont have it! There mus…
I'm trying to write a routine that plots ... times in loop)
ld a,96 ;green paper black ... br /> ld (23695),a ;set colour
ld a,(hl) ;load a with ... energy level
ld b, ... be plotted
ld c,a ;load c with ammended ...The 'why did I buy that?' threadWhich games did you shell out your hard-earned cash on - despite crap or indifferent reviews? I remember spending ?7.95 on Ocean's [URL="http://www.…
... indifferent reviews?
I remember spending ?7.95 on ... once, thinking it was a load of old slow ... gave it 45%, and I hardly ever bought games which ... budget games)
I re-visited it the other ... what? It's [I]still[/I] a load of old slow ...Rotronics Wafadrive v.1.80 ROM - Corrupt or purposely broken?I've been digging around the Wafadrive v1.80 ROM (from [URL="http://zxspectrum.it.omegahg.com/_RO.htm"]here[/URL]) and can't decide if the ROM is cor…
I've been digging around ... on purpose...
I was interested to see what ...
add a, a
push de
ld hl, $009f< ... push hl
ld e, a
ld d, $00
ld hl, $0cf7 ... /> ;
[/CODE]
I haven't found any other ...Strider II (and others) + 3 disk versionsHello everyone, I've been working on converting some games to be able to load them from the +3 floppy. I started with single load games but now Im i…
... games too. So far I've converted successfully Ninja Spirit ...
The disk loader I wrote will load the levels ... ld (levid+1), a
ld a, (23399)
ld (rombkup), a
ld a,4
ld (23399),a ... />
Also I have a LDIR routine at 48641 which ...trying to read keyboardI have the speccy in interrupt mode 1 I used 'IM1' in assembly language then Im printing the contents of memoryu area 23560 to the screen: [quote] l…
... in interrupt mode 1
I used 'IM1' in assembly language ... #16
LD A,#0
LD (#23560),A
LD A,(#23560)
I forgot to load the C ...Routine for Currah speechI'm currently writing a routine for the Currah that will provide speech during a game. A timer is set to initiate the speech every 50 cycles of the …
... of the game, but I want 5 different allophone sets ... to be cycled each level i.e. level 1 would ... 15 bytes long so I somehow need to times ... into HL...
I've been pushing and popping ...
ld a, (tim) ;timer
inc a
ld (tim),a
...JSW1 - Changes Between ReleasesHere is a list I'm working on of differences between JSW versions. I'm not currently 100% sure what all the changes do although by using one of the J…
... *** 000 *** 000 *** 000
I think these two have something ... *** 000 *** 000 *** 000
I think these are related to ... before a LD BC, 2862 to just one NOP and a LD (DE), A with ... 231 *** 231 *** 239
I've seen this listed before ...JSW2 - Game Loader DifferencesThere are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it …
... official releases of JSW2. I'm not counting the ' ... here as far as I'm aware this was ... 'official' as it incorporates a built in cheat mode. ...
Also, James has added a feature to this version, whereby ... examining the basic itself I then decided to simply ...RCS HelpThis plea for HELP is related to the RCS screen handling routines thread. To further save space in the current crop of routines its looking like the …
... D first, then E.
I'm wondering if using the ... /> Current routine:
[CODE]78 ld a,b
A9 lp1 xor ... xor c
57 ld d,a
A8 xor b
07 rlca
5F ld e,a[/CODE]SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
I've been using the SCREEN$() ... space with an array and I got fed up with the ... stacking bug in it so I wrote this little replacement fix ... ,ScrDone
ld a,(de)
add a,$70
ld (de),a
ScrDone ...LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…
... compressed format specification[/URL], I thought it looked fairly ... advance past token
ld c,a ; keep a copy of the token ... the lowest four bits set, i.e. four less than the ... the stream file. I've written a separate (PC-based) ...Troublesome routine, help needed!Having problems with this routine, it basically fires a rocket up the screen, but refuses to detect collisions. I'm using attribute blocks for detect…
... , but refuses to detect collisions. I'm using attribute blocks for ... detect something in its way, I've tried allsorts to remedy ... LD A, (rx1) ;calculate ATTR
LD (av1), A
LD A, (15)
LD (bv1), A
LD A ...Simple memory transfer routineI'm looking for a simple memory transfer routine that shifts 32 bytes of data from the address HL is set to 55143, I have tried using LDIR, but cant …
I'm looking for a simple memory transfer routine ... is set to 55143, I have tried using LDIR, ...
ld a,(51990) ;level number
ld b,a
ld hl,udg ... br /> djnz loop
ld b,32 ;hl should now ... level x 32
ld de,55143 ;de pointing to ...Foggy London - A 'Sherlock' EnvironmentAfter visting [I]WILDERLAND[/I] a year ago I have no moved on to [I]FOGGY LONDON[/I] at the turn of the last century! -- Have you ever asked yourself…
... [I]WILDERLAND[/I] a year ago I have no moved on to [I]FOGGY LONDON[/I ... with my Sherlock environment [I]Foggy London (FL)[/I]!
[IMG ... ]
Visit the [I]Foggy London[/I] webpage at
[URL ...Z80: ABS(HL) functionI must be very tired but I cannot get my head around whether this function provides a correct implementation of a ABS function for a signed 16-bit va…
... positive
LD A, H
CPL
LD H, A
LD A, L
NEG
LD L, A
RET ...
[/code]
I know I can perform a ...About how z88dk generates code and makes room for variables.When you attempt to code games for the 128K models using z88dk in C you need to somewhat control where variables are stored in memory. I thought tha…
... in memory.
I thought that z88dk created space ... script = 9;[/code]
I can see int he debugger ... [code]ld A, $06
ld ($5EF1), A
ld A, $07
ld ($5EF2), A
ld HL ... this happenning? How can I prevent this from happenning? ...Calculating screen address to alternative ATTR area?I'm using this small snippet of code to convert a screen address to an attribute cell address... [CODE]AttrDE: ld a, d ; get the hig…
... tired (which I am...[I]a lot[/I], but I was hoping I could just change ... ?
[CODE]DFtoATTR LD A,H
RRCA
RRCA ... /> OR 58H
LD D,A
LD E,L
RET ...Convert AT co-ordinates to PLOT co-ordinatesHow do you convert the 2 from MC? I don't know how to convert the vertical value as they're differently ordered... Heres what I have so far: [CODE]…
... the 2 from MC? I don't know how ... />
Heres what I have so far:
< ... points
ld a,(50000-3) ;vertical AT co ... ld b,22
sub b
add a,a
ADD A,A ...
add a,a ;times by 8
ld (x),a ...
