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Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... once
ld bc, 256 ;Make 256 copies
ldir ;Thusly
ld A,254 ;High byte of address table...
ld I ... data
pop af ;Scoop up 8 bytes into registers
exx
pop af ;Scoop up 8 more bytes into registers ... -
A tidy loader for minigamesThe minigame competition doesn't permit the use of separate loaders like [code]10 LOAD "": RAND USR 32768[/code] The loader must be included in the b…
... [code]LET a = PEEK 23635 + 256 * PEEK 23636[/ ... code]
The program looks like this, byte ... 1018 65 Variable name (a)
1019 0 Mantissa ... s a way to squeeze out another byte or ... you'll end up executing byte 4 (the ... -
Copying a SCREEN$ in ZX BASIC in 1 second?!Following on from the revived "[thread=20207]Saving a complete SCREEN$ in BASIC[/thread]" thread (although Arjun really only needed a suitable POKE i…
... 6912): DEF FN p(a)=PEEK a+256*PEEK (a+1):
DEF ... FN l(v)=v-256 ... h(v)=INT (v/256):
LET udg=FN ...
[spoiler]It works because LOOK-VARS searches the DEFADD area ... VARS. So it sets up a dummy DEFADD area in the ... -
Can anyone see a way to speed up the following line of code?Hi Folks, Been looking at bottle necks in my code using BASin's Profiler and the following line (well the 2nd LET statement) is somewhat slow. [COD…
... INT (CODE z$(a,4)/16)
LET a$=(("D" AND ... h)+("DP" AND z$(a,o)=CHR$ 10)+STR$ (( ... 16)*65536+CODE z$(a,6)*256+CODE z$(a,5)))[/CODE]
Does anyone see a ... way to speed it up?
... -
DisarrayFor the sake of having some clarity [COLOR="Silver"]for once[/COLOR] I have the project data in several source files according to their types. E.g. t…
... align nicely since most of the LUTs sizes are multiples of 256 ... which is supposed to have a 24 byte LUT in the middle ... of it, another 8 byte one in the beginning and ... I just can't come up with a neat clean-cut way ... -
Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…
... partitioned memory (i.e. a table on 256 byte boundary) I have optimal ... up with so far.
[CODE]
ld a,#x ; symbolic. a ... /> ld b,a ; our shift counter
xor a ; a=0
Is there a more optimal approach to creating ... -
Repton ManiaHi all, I am the creator, and look after, the Repton Resource Page ([url]www.reptonresourcepage.co.uk[/url]). For the site, I have written a freely …
... /> I am the creator, and look after, the Repton Resource Page ... /> 0x0A6F2 unknown
0x0A7B6 Lookup table into the screen memory
up/down frame 1
27 ... 02 ED. Finally, every byte directly following a single ED is not ... -
Tutorial: Using UDGs in SpecBASSpecBAS is capable of using graphics mode, in a similar manner to the original Spectrum. Like most things though, the extended nature of SPecBAS's ab…
... is a font, as you can see when you look ... bit per pixel, making up one byte per row. Because SpecBAS ... uses one [i]byte[/i] per pixel, we ... for each of the 256 characters, takes up 16Kb of space ... do that by reading a byte, and then extracting each ... -
i want to start writing my own gamesi want to start writing my own games but have no idea how. is there any downloadable dummys guides or some software that teaches u how. the only expe…
... you didnt even have to look up a table to read that?[/quote]
a common structure.
If ... want to see something from a PRINT USR statement that's ... to load BC. The last byte is RET, C9, or 201 ... -
Platform vs BackgroundForgive my ignorance if this is a 'stoopid' question, but although I've written games for many platforms over the years I'm only now making my first …
... " with colour indices 0-256, storing a true physical colour. You ... colours on screen, you perform a table lookup in the "virtual pallette ... state of a state machine. Your program uses a single byte or integer ... object that can be picked up is here; an enemy ... -
Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…
... code in C that clears up timing questions. For the record ... this to keep up speed.
"ptr" is a pointer into ... I looked at generates a table of fixed point byte offsets to add ... with this code. I'd look at reducing the volume setting ... -
Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…
... the play sample routine, look up in a table. The note will range ... so we need a 2*296=592 byte period table, assuming 2 ...
You'd construct a 592-byte table using this formula, and using ... note + finetune possibility. This table is available in one of ... -
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... had never thought of using a preshifted byte table. But I think it ... ", as you have to look up the table for every byte, which is fairly ... sprite. You could use a multiplication table to do the time 96 ... store all the data in a table for each of the sprites ... -
Fast division in machine codeHi Does anyone know what is the fastest way to divide a 16 bit number by 24 in machine code. Derek [ This Message was edited by: dmsmith on 2004-0…
... such a bad idea - divide by 8 with some shifts, then look up ... that result in a table that divides by 3 ... read a 2-byte value
RES 0,L ; from the table
byte...
LD D,(HL) ; result ... -
InterruptsCan someone help with providing some info or a link about IM 2. I know I need to create a vector table and want to store this as high in memory as po…
... supply the low byte and hence you could have a table of vectors ... you'll possibly end up looking in your table between two other ... if you have 256 possible values for the low byte and you ... low byte and A100 for the high byte. Thus meaning you table needs ... -
Pocket Clive - 2 QuestionsHello, I've just started using Pocket Clive on my iPaq pocket PC, excellent emulator BTW. 1. I have just wrote a small BASIC program to randomly pi…
... , (using the trick of having a 257 byte table filled with $ff)
Therefore, we can safely insert a halt ... get some more time to look at the problem, my next ... 'halt fix' method undoubtedly uses up more T-states than the ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... will allow you to set up whatever kind of memory map ... entire display (32x24) and sets up the memory map described at ... a 512-byte table of pointers. Each entry in the table is a pointer to a ... two 256 byte arrays, with the first 256 bytes containing the LSB of a ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
...
"sprdrawftbl[]" is a table of sprite draw functions used ... a 2-byte software-rotated masked sprite. How I came up ... table ("idtypetbl[]"). This table associates a constant sprite ID with a table ... directive tells z80asm to look for these draw functions ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... list, hash table, heap, stack and queue. Byte- and word- ... [U]Hash Table[/U]
A hash table is a fast table lookup. One ... pairs in a hash table. One uses a hash table by supplying the ... hash table.
You will notice that this key look up ... -
The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... much as a Spectrum, required a dedicated datarecorder ... br /> PLA ;PULL LOW BYTE FROM STACK
INY ... org $c300
ArrayAddress: .block 256
--------------------------------
... and if you look up the clock cycles ... -
Cybernoid editorSo, my long tern goal is to make my own Cybernoid or Rex like game (see an ancient thread about Sprite advice)...but my skills are somewhat lacking..…
... by HL. If you look up a bit from that bp it ... at #75e0. Try poking a few different numbers from that ... />
The enemies are a bit different with this one ... they are show as (1 byte each, 3 bytes total). ... same enemy table) and the end of their 3 byte data ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... br /> // start of a new line, look for special chars
up is to look for special command ... has each byte in a character square separated by 256 (0x0100 ... h (which you can look up in the wiki) and ... so you can have a look. You'll find the ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... up all over the place, hence these subroutines. Let's have a look ... characters ending in a '0' byte). "strlen()" is a well-known function ... . itoa() also appends a terminating "0" byte. In other words, ... shows this distribution in table form for three cases ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... incomplete. Nevertheless let's have a look at both of them now ... the number is a four-byte long rather than a two-byte integer), 1000 ... on plane 128. SP1 supports 256 sprite planes with sprites located ... where we used it to look up the player's colour and ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... 50Hz interrupt. Let's have a look at them now (from interrupt ... up a sprite into its characters and represents each character by a 24-byte ... the next scanline in a char is 256 bytes away so once ... that is done "disp" gets 256 added (0x0100) to move down ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... print
ld (de),a ;??print a blank byte on line1
nextbyte ... a,c ;check that line count again
and $3f ;look at ... of 256 up the display file
ld h,a ;point there(byte to ... of 256 up the display file
ld d,a ;point there(byte to ... -
Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…
... the interrupting device supplies a single-byte instruction to execute ... cycle. This is usually a RST n instruction.
... byte during the interrupt acknowledge that is used to look up ... the interrupt service routine address CALLed from a table ... -
Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... you know whether a given tap will produce a long enough sequence ... before repeating?[/QUOTE]
Well I look up ... the taps in a table like all the other ... br />
I tried out a 16-bit LFSR for plotting ... -
VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…
...
It's shaping up to be a CSSCGC 2009 compo entry ...
; PTR2 points to 256 byte table of worm segment positions
A & WORMPOS TABLE
TYA
COMMODE_NYBBLER
; A commode has been nybbled
