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Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... /> add hl,hl
add hl,hl
add hl, ... without adding an offset value to the base address of ... good. It removes the ADD and also frees up ... yesterday. Specifically, how to draw the sprtites and ... down.
Time to get started!
... -
Algorithm for rounding fractionsI could use some advice :smile: Let's say that I have some percentages that sum to 100% for example: 9,52% 28,57% 38,10% 9,52% 14,29% Now I'd like…
... is correct, if not, add a small value to every number (one by ... will depend from the small value that you will add. -
Need help with tzxingI recently got a copy of this Polish text game: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0006622[/url] I can't make a tzx of it howeve…
... is what I believe to be the assembler code from ... SP),HL
DI
ADD HL,BC
LD BC ... AND 251
ADD A,14
LD (IX+0),A
ADD A,(IX+51)
SUB (IY+0)
ADD A,(IX+52 ... ADC A,H
ADD A,(IX+17)
LD H,A ... -
Getting the contents of tablesHi All, I'm risking a potentially daft question here as it seems pretty fundamental but here goes: What's the best way of pointing register pairs a…
... amp; nothing seems to say it's any different to IX. Confused. [/QUOTE ... it but only IY original value isn't preserved. So ... it suddenly has some value thet you never set ... />
If you want to use IY you'll have ... to learn about interrupts :) and ... -
Pixel engines for explosions...Hi... Iv a strange request... I was toying around with an old YS program, which can be found here: [url]http://www.users.globalnet.co.uk/~jg27paw4/ty…
... /> ; THESE FIRST 12 BYTES HAVE TO BE POKED WITH SETTINGS PRIOR ... /> ;at. Choose the numbers to POKE into here..
;0 ... ;Choose a speed from 1 to 255 and then:
half_vrange ... /> LD A,(IX+0)
ADD A,(IX+2)
LD (IX+0),A ... -
Pixel engines for explosions...Hi... Iv a strange request... I was toying around with an old YS program, which can be found here: [url]http://www.users.globalnet.co.uk/~jg27paw4/ty…
... /> ;at. Choose the numbers to POKE into here..
; ... LD A,(IX+0)
ADD A,(IX+2)
LD (IX+0),A ... ; Begins a Calculation that points to SCR_TABLE
; Originally ... ; LD D,243 ; Points to high byte of UNKNOWN2 table ... -
playing sound samples from Boriel's zxbasic-compilerfirst of all, sorry if it sounds confusing if i'm posting this thread here instead instead of at Discussions:SinclarBasic it's because this is more …
... an old disk this evening to see if I can recover ... /> [code]
; Uses PWM techniques to turn beeper into a DAC ... value to vary where the output goes to zero. One loop iteration takes constant ... /> I can already see how to speed up the loop using ... -
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…
... . Thus you will have to explicitly disable it yourself, ... [*]The other solution is similar to the ZX81 character set, where ... (just add 128 to the character value to obtain the same value in inverse ... ). For instance:
[CODE]
FOR f=32 to ... -
Unreal Championship PC alpha version foundFans of the Unreal games might not have heard of Unreal Championship, or at least not played it, as it never came out on the PC. Well, not really. Th…
... is undergoing constant development (although new maps would have to be build ... follow up to Quake 2), but they released an add on pack ... increased agility allows you to skillfully travel quickly to any part of ... see how it does add some thought to the game, but I ... -
Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…
... 128K spectrums didn't really add much value.[/QUOTE]
I ... graphics...
:)
To me, the best Spectrum games ... -
Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…
... to debug. After launching I enter the debugger and manually add 2 to ... the PC value to skip past it to my real ... to write the same on the screen line below. Then add a ... loop to write 16 lines for ... -
Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…
... to debug. After launching I enter the debugger and manually add 2 to ... the PC value to skip past it to my real ... to write the same on the screen line below. Then add a ... loop to write 16 lines for ... -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... />
I tend to jump to address 1331 when my stack ... magenta flashing border without having to write any code.... This ... /> To size your stack, fill the stack space with a constant value, ... run the code for enough time to exercise ... -
Disable interrupts?Well, I've read the bits from the David Webb book about interrupt modes and (vaguely) appreciate the principles behind having a vector table, after r…
... main routine using a notional value to slow things down, just because ... did or whether it needs to reference FRAMES or not... I ... choices; (a) ignore interrupts completely to keep it simple, or (b ... at a constant rate. The downside of (a) seems to be potentially ... -
Another request/idea for infoseekHello Martijn, I was thinking that some of the games which are considered as "commercial", were indeed commercial, but not in the strict sense, I mea…
... types of "commercial release" to separate these games?[/QUOTE]
to obtain the product', nothing more ... definition you provide has nothing to do with something being ... I'd rather not add yet another value to the list of publication ... -
Generating a constant of 2?Hi Folks, Through "The Wizard of WOS" I learnt that you can generate constants as follows: [B]NOT PI=0 SGN PI=1 INT PI=3[/B] Is there a quick way …
... , e15 and e16 (the constant value being the number) and used ... , assigning frequently used literals to short variable names can save ... t usually make much difference to performance. Particularly time-critical ... assigning a variable name to a literal; anything less ... -
Generating a constant of 2?Hi Folks, Through "The Wizard of WOS" I learnt that you can generate constants as follows: [B]NOT PI=0 SGN PI=1 INT PI=3[/B] Is there a quick way …
... assigning a variable name to a literal; anything less ... it's a long value and a short name ... . use a HEX value to indicate the constant value. In terms of ... made by using "GO TO/SUB variable" for frequently ... to be changed. [/QUOTE]
I can see the value ... -
WANTED: Britain Invaded! instructions[deleted]
... the "Britain Invaded" listing to a text file and placed ... br />
I take this to mean "Attack?"
... />
The attacking combat appears to have a pseudo-random element ... random seed is apparently set to constant value at the start of the ... -
converting mp3 to zx importfile.is it possible?Hi peeps I am just looking through old threads and browsing through music tools on the zx in particular converting or creating ,what i am looking for…
... Id probably aim to try to synthezise just one ... with some preset settings to play in occasonal clusters ... or two pips, add some code to playing it in ... then your going to have to get your hands dirty ... routine more complicated to avoid constant repetition of the ... -
Specbas Photo'sOK here's a place to show us some screen grabs of Specbas programs Here are some of my Invaders screen grabs [IMG]http://i699.photobucket.com/album…
... ;611889]
TO: ASH-II : could the ... to quote Dunny
[quote="Dunny"] [B]I've decided to add ... more commands to make writing this ... DAD HL (add the value of HL TO HL) then ... command that allows you to single PEEK the single ... -
The Elder Scrolls V: Skyrim...has been confirmed! [url]http://www.computerandvideogames.com/article.php?id=280129[/url] A direct sequel to Oblivion, and has been in developme…
... by name, weight, and value.
To get an early look ... set of game add-ons that will be exclusive to the Xbox ... 360. This additional content will add new ... quests, locations, features, and much more to the ... -
Arcade Game Designer 2.0 releasedI know dozens of you downloaded the previous version of AGD. Well, you can put it away now because I've made some major improvements to that version…
... /> Command. Expects to be followed by a number to add to the score. SCORE ... 100 will add 100 points to the ... player's total. Values 0 to ... only for make the sprites' value.
And I gathered, ... -
Intermittent sound cutting outHello, I'm resurrecting an old rubber key spectrum. Originally it had no sound at all, diode D9 was blown, I replaced it with one from my other dead …
... turns out to be OK then it has to be ...
If you intend to replace the speaker you have ... to make sure it has ... to add a resistor to the speaker to match the original impedance value ... must add a resistor of 10 ohm resistance to match ... -
ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
... for a small routine to read the entire video ... the Spectrum; to copy data, i.e. to read and write ... new features within ESXDOS to be able to say "find me ... it's really easy to work around the issue on ... and it doesn't add any "coolness" value to the project (which ... -
ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
... the Spectrum; to copy data, i.e. to read and write ... new features within ESXDOS to be able to say "find me ... disk".
To be honest, it isn't ... it's really easy to work around the issue on ... and it doesn't add any "coolness" value to the project (which ... -
Rescue by Mastertronic Debugging QuestionJust wondering if anyone knows how to move the spawn points of the enemys in the game Rescue by Mastertronic made by ste cork using the debugger in s…
... places a value in (IX+0)&(IX+1) which is transferred to BC ... a CALL $BBE7 converts this value into a display file address ... on RET is copied to (IX+7)&(IX+8 ). For example, BC ... -
What's going on during a reset?Always wanted to know this. Why does the screen fill with garbage then white lines on black then just a totally black screen? What is happening?
... /> ; of NEW the supplied top value. The entire screen turns black ... H,D ; Transfer the top value to the HL register
LD ... to subtract.
SBC HL,DE ; subtract and add back setting
ADD ... -
ISO-Copy - Individual Software revisitedHi folks In another thread about Supertape: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36203[/url] ... we touched on ISO-Copy by th…
... should not forget to subtract one to every value we got.
value to Z80 cycles (as timings ... 25, a very near value to the one we got for ... to that we haven't a clean array of pulses of constant ... take, and get to a median value. You can see ... -
In Java for ZXHi All I am glad to notify you that I have opened the sources of my J2Z80 translator (0.1 version) which allows to use Java toolchain to generate Z8…
... LD HL,0
ADD HL,SP ; HL equ ... LD E,A
ADD HL,DE ; HL is ... new value
PUSH IX ; place the old IX value on ... the stack
PUSH DE ; load IX ... PUSH HL
POP IX ; the old IX restored
Multiply the value of 'a' by 5Is there a way of multiplying the value of 'a' by 5? I've tried 'add a,a' etc. but only get multiples of 2...
... a copy of the original value of A in B you ... the digits 101 from left to right and for each digit ... value (ADD A, A)
[*]If "1" then add the original value to the current value (ADD ...
