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Pixel Color IncorrectHello i am new to the ZX Spectrum and z80 assembly language. I am coding my first game and am having a small problem. I am trying to make the botom r…
What FrankT said.
You can set the attribute for any combination by using the formula:
attr = 128*flash + 64*bright + paper*8 + ink
where, flash = 1/0 (on/off), bright = 1/0(on/off), paper = 0..7, ink = 0..7 -
Kobrahsoft DB1 - doesn't work?Hi, I've tried loading [URL="http://www.worldofspectrum.org/infoseek.cgi?regexp=^DB1$&pub=^Kobrahsoft$&loadpics=3"]DB1 by Kobrahsoft[/URL] into two …
... REMs holding machine code and a PRINT USR 0 followed by what may ... know anything about until I read [url=http://www.worldofspectrum.org ... a real +3? - because that's what the R-register is getting set to at ... -
Unlisted game - The Battle of MaidaI've just moved back the the UK and unearthed a game called "The Battle of Maida". I really loved this game back in the 80s and I believe a friend of…
... /> to 8-bit mono @ 44100Hz:
It'd be best to sample at ... "S.C.JACKSON. 1985", that was easy to extract, but the rest...:sad ... 2 wanted blocks, but that means
this is a "development" copy? Line ... , with the common values 0,1 and 2 declared as ... -
User Defined GraphicsCan someone please give some very simple code for a displaying a UDG at a location on screen? Any assistance would be greatly appreciated. Sincerely…
...
For UDG graphic is reserved 21 chars (8x8 pixels ... FOR F=USR "a" TO USR "a"+7:READ B:POKE F,B ... br /> 30 PRINT AT 10,10;"a"
Char "a" in line ... PRINT AT 10,10;CHR$ 144)
UDG font size is ... 168 bytes(21 chars x 8 bytes each ... -
TZX format rev. 1.21Once 1.20 draft seems to be official now I would like to suggest some additiones to do on 1.21. I hope it will be easier to upgrade once block 19 has…
... a new routine to print that field to screen.
All those tasks are easy ... info logic routine is already done into ... /> Case H Of
0: ListBox.Items.Add('Title - ... Add('Protection/Loader');
8: Details.Add('Origin');
... -
MCODE problem...Hi Folks, Trying to write a simple machine code program to hatch the screen. So far I have the following but even this is not working - it does not…
... can see that we need to switch from AA to 55 exactly ... test if we use the 8-bit (byte) INC mnemonic ... because 8-bit INC sets the zero ... )
4) INC L is faster than INC HL and ... trips back to 0 then we get a chance to manually INC H at the ... -
SP1 library questionsI'm working on my first game. I've not written a game since the late 1980s and that was a text based multiuser dungeon for BBC Micros with econet... …
... not you will have to construct a rectangle that is the intersection of ... of 32x24 is mapped to the screen at char coordinate 0,0 etc). Without ... , move sprites to new locations, redefine tiles, print new tiles and ... be used as an easy way to create pop up menus ... -
AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…
... a rather complex expression, as for drawing a sprite with a mask it is ... data (the 8 pixels to draw at this position). msk is the sprite mask ... bits 0 let the corresponding pixel in the background to show up (that is ... -
fav spectrum charactermy fav spectrum character is called dizzy
10 PRINT AT 0,0; CHR$ 134; CHR$ 128; CHR$ 137
either 134 or 137 :-(
in our day we had no sprites and were lucky to get a UDG -
Mazes and Tremaux's AlgorithmI've done a version of Tremaux's maze solving algorithm which solves my current test maze with 400 junctions and 715 connections in a reasonably quic…
... point.)
Below is the reverse search segment, although ... location 'sa' to location 'so'; u$() is populated earlier with ... gets a route where all the required key items on that ... /> 1214 PRINT AT k3,k0;"Depth=";jp,"Checked=","From=","To=": LET ht ... -
Create a new microdrive cartridge image formatHi there, I'm working to emulate the IF1+Microdrives in JSpeccy.I've found what the "classic" MDR format ins't capable to store all the required inf…
... is another history that needs another "brick" message ... easy convert MDR to MDV at reading time, another different matter is saving a ... . Moreover, is possible to read a 180 sectors ... VERSION to #GAP ENTRIES, first 8 bytes not ... GAP is a byte value where [b]0 is NO ... -
Noob needs helpSorry gents but decided to have a play with basic...see if I could knock up a shonky as hell space invader type game I seem to have gotten myself co…
... /> Currently experimenting with trying to put some UDGs in....but ... this Send command referred to in the help ...
10 LET y=8 :REM initialise y
... br /> 40 PRINT AT 0,0;y;" " :REM Just to print the value ... of y (obviously)
50 GO TO ... -
Faster CLS...Hi Folks, Looking at the CLS command in the Spectrum ROM disassembly it seems rather complex. Does anyone know of a simpler/quicker routine that wi…
... working which is a bit strange. May be this is a "feature" of that emulator ... . I was hoping by having a faster ... , if you want to reset the print position, just do "PRINT AT 0,0;" From Basic ... -
Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…
... at exactly the same time every frame, which isn't as easy ... instruction was a HALT, that works like a lot of ... instructions, but that in itself is very hard to test. ... 8 pixels.[/QUOTE]
Well, it is possible to ... cz/taps/misc/timingtest-0.2.zip"]timing ... -
IF....AND......THEN statementsSorry...more questions Now initially I thought this should work....but now thinking about it it is doomed to fail as if the player's x co ordinate a…
... THEN PRINT a$" would only display a$ onscreen if a+b is not equal to 0. If a ... ) if a is indeed 1, and "0" (false) if it's not. That is the ... a is 0, and "0" (false) if a is non-zero. It's a brain-bender at first ... -
Reading interface 2 using the IN commandHow do you read using the IN command from BASIC? You can read multiple keys at once, but I cant remember the values...
... /> 10 print at 0,0; in 61438,: go to 10
Run that program, press ... like to use a variable to read the row and then create a routine that handles that ... error message caused by invalid cordinates:
Let a=(-1 and a ... -
Another BUG play tapes, in ALL EMULATORs when press STOP1 FOR n=1 TO 20 : PRINT IN 254 : NEXT n : PRINT AT 0,0 : GOTO 1 RUN Type this simple code, load a TZX, pres PLAY, when ear input change between 191 …
... n=1 TO 20 : PRINT IN 254 : NEXT n : PRINT AT 0,0 : GOTO ... stop, the input need to be 191, not 255 ... value the tape player is feeding to the ULA when it ... There's no guarantee what that will be - it might ... If you're writing a loader for a Spectrum, making it level ... -
countdown timer ?just curious if there was a pre-made one about that I could use to count down from 999 to 0. in MC / under interrupt, that returns to basic? but how…
... how that Alarm Clock routine could be used to count down from a ... single 'start' number and jump to ' ... br /> PRINT AT 0,0;hr*24+mi*60+se;" ":
GO TO (PEEK 23621 ... the next line number, so that will work regardless of which ... -
Turn UDG to Attrribute blocksI'm trying to enlarge my UDG's to 8 x 8 character blocks per pixel, but struggling, is there any subroutine/program for enlarging UDG's x 8?
Umm. That's not exactly what I ... 0..15. It seems to me a waste of time devising a complicated loop to ... /> [CODE]PRINT AT 0,0;
LET u = USR (u$)
FOR b = 0 TO 7 ... l = p-(h*16)
PRINT b$(h+1) ; b$(l ... -
How much space does a number take?Hi Folks, Could someone please remind me how much memory a number takes up in a BASIC listing. For example, if you had: [CODE]100 LET a=3000[/CODE…
Here's a little program to list the length (excluding the 4-byte header and the trailing ENTER) of each BASIC line in the selected range.
[code]
9990 DEF FN p(a)=256*PEEK ABS a+256*PEEK (ABS a+1)-255*PEEK (ABS a+(a -
'Spectrum Play' ErrorI always wondered why the screen sometimes filled with 'SPECTRUM PLAY' if I loaded a 48k game in 128k mode (using my 128k+2B). Colditz Story in parti…
... PRINT AT 0,10;"Hello World"
20 POKE 23606,1
30 PRINT AT 0 ... ago I wrote a demo which displayed text to a story by fading ... in/out the colours to get like a film credits effect. When ... the story got to an earthquake ... -
What is the best way to detect CAPS LOCK?Hi Folks, Not sure what the correct behaviour is here as I do not have access to a real Spectrum. Under BASin, when you press CAPS LOCK on the PC k…
... 0
120 PRINT AT 21,0,,
130 LET a=PEEK 23560
140 PRINT AT 0,0;a ... ,CHR$ a
150 POKE 23560,0
160 GO TO 100 ... -
Work out attribute location in MCHow do I go about writing a MC routine which calculates the attribute address from a set of PRINT co-ordinates. I know you in basic you multiply the…
... load a 16bit, that is two byte, value from 60000. The byte at 60000 ... need is:
LD A,(60000)
LD L,A
LD H,0 ...
To get the byte ... in the lower 8 bits ... -
INKEY$ giving me troubleHello, I have been using BASin (great program by the way...) Sad though it seems during the typhoon here I have been re-learning my spec-skills an…
... at the start of the program with POKE 23658,8 (on) or 0 ... long as the relative spacing is maintained. (FN c() returns ... at lines 35 & 107) then a check should be included to ensure that ... released before the second option is checked, because otherwise the key ... -
Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …
... row at a time.That means that during a keyboard read, only one bit of the 8 ... the data read from that 3-bit input is the row number (0 to 7 ... ).
Better yet, use a 8-to ... -
.chr to .binSo here goes another stupid question. What's the best way to convert .chr files created with ZX-Paintbrush to binary or asm format? I know ZX-Blocked…
... which will print all 256 characters (without shuffling around CHARS, that is)?[/QUOTE ... BASIC has had support for 8-bit character set printing ... file in at 16384 for whatever code page you want to use ... [img]https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-snc7 ... -
Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…
... of the other control lines that is not working (may be /CAS ... that the upper DRAM is not responding to the Z80 MPU at all, and that ... what the Z80 MPU is ... want to test
20 LET b=PEEK address
30 PRINT AT 0,0;a ... -
BASin gets its (profile) sums wrong (sometimes)I often use BASin to time pieces of code, and I've found it to be useful, but I was testing a routine earlier, which took less than 2 seconds to run …
... BASinC v16r3 and it reports that it takes 11.3 seconds ... frames). This looks right to me as I measured it ... it took about 11 seconds to run.
Profile ... /> [CODE]100:1 FOR R=0 TO 20 = 27,131 Ts
TO 32 = 6.5 Frames
101:2 PRINT AT 0,0;r = 8.4 ... -
Covering my tracks using OVERI've got myself in a bit of a mess again I'm afraid, the routine I have written is for 4 characters to move across the screen 2 spaces at a time in I…
... thus if moving rightwards a string of length l by ... it's just necessary to deal with the situation ... less than (s+l) print positions remaining on the line ... to the right-hand edge:
LET p=32-c: PRINT AT 0 ... ,c;a$( TO z-(z-p AND p -
Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…
... ULA, the 8 half-rows are connected to the high address ... row.
To read the whole keyboard you have to read the inputs ... eight times each with a different ... address line is at 0v this pulls the input down to 0 signalling a "press ...
