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In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…
[QUOTE=Paolo Ferraris]This is a good point. Anyway, if sorting is needed then I'd strongly suggest, for sprite sorting, bubblesort over the other sorting methods: it is simple, uses few memory, and - more importantly - it is very fast for almost-sorted ... -
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…
... 00 ;TURN EXCHANGE FLAG OFF (= 0)
STY $32
... FF ;TURN EXCHANGE FLAG ON (= -1)
STA $32
... /> ld hl,1 ; Setting H=0 and L=1, for optimising speed ... temp_sp .dw 0
restcount: .db 0
counter: .db 0
< ... -
The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... to check max numbers - 1
ld e, 0 ; reset swap flag ... goto next
ld e, 1 ; flag we swapped bytes
dec hl ; move back 1
ld (hl), c ; ... is very close to 2:1 in all cases, largely ... NTSC but in your region 1.02.
That ... -
Font centering problemA while back today, I started coding a simple Othello/Reversi game in BASIC, with the precious aid of BASin (great tool, hope it eventually becomes b…
... =PEEK (chars)+256*PEEK (chars+1)
40 CLS
50 ... OVER 1
60 PRINT 0;"12"
70 FOR r=1 TO ... 7
80 LET c$="1"
90 PRINT AT r ... ,0;r;
100 GO SUB ... -r)
210 FOR i=0 TO 7
220 LET ... -
Programs detecting Spectrum modelsHi. I'm curious about knowing how some speccy games detect if they are runnning in a 128k or 48k model. What tricks can be used to make this in a Spe…
[code]POKE 49152,255: POKE 23388,17: PAUSE 1: POKE 49152,0: POKE 23388,16: PAUSE 1: IF PEEK 49152255 THEN [48K mode] ELSE [128K mode]
[/code] -
Programs detecting Spectrum modelsHi. I'm curious about knowing how some speccy games detect if they are runnning in a 128k or 48k model. What tricks can be used to make this in a Spe…
... : POKE 23388,17: PAUSE 1:
POKE 49152,0: POKE 23388,16 ... : PAUSE 1:
IF PEEK 49152255 ... -
Floating point representationI'm planning on picking up the [url=http://matt.west.co.tt/category/spectrum/openzxrom/]OpenZXRom[/url] project from where I left off a few months ba…
... its valid values are 1..255. So 0 means kinda "denormalized" number ... -
My Dell TFT Monitor deadMy Dell E171FPB monitor is dead... it wont turn on... even the LED wont come on.... I've checked the usual...cable and fuse.... I am trying to dism…
... to Inverter
1 ------ 1.45v - 1.55v fluctuating
2------- ... 5v
6-------1.3v-1.7v fluctuating average 1.5v
... Visual
1 ----- 1.3 - 2.0 seemed to regularly cycle ... 0v
7------1.3v-1.7v Fluctuating avrage 1.5v
< ... -
Oh so BRIGHT!What is the SLOWEST way to change the attribute area to BRIGHT? It has to be legit! No meaningless instructions or doing stuff for the sake of it. …
... ,(ix+0)
add a,1
ld (ix+0),a< ... br /> set 0,d
ld a,(ix+0)
and 63
... -
SCART Lead and C= 1940 MonitorHi, I've decided to make a SCART lead for my +3 I've been doing a lot of searching on the internet and forums but I'm a little confused as some peop…
... Ohm resistor)
PURPLE +12V 1 - 8 Audio/RGB switch
1 down to 0.84V and prevent the ... auto switching). (Pins 1 and 5 ... -
Getting scr addresses from x and yCould someone please tell me how to calculate the 8 screen addresses corresponding to a character printed in basic at coordinates x and y? For examp…
... /> [code]3000 LET x=0: LET y=0: LET z=127
3139 PAUSE 0
3140 IF INKEY$="q ... " THEN LET y=y-1: IF y23 THEN LET y ... =0
3160 IF INKEY$="o" ... THEN LET x=x-1: IF x31 THEN LET x ... =0
3190 POKE 22528+x1 ... -
Getting scr addresses from x and yCould someone please tell me how to calculate the 8 screen addresses corresponding to a character printed in basic at coordinates x and y? For examp…
... =0: LET y=0: LET z=127: LET a=0: LET b=0: BORDER 1 ...
3010 PRINT #1;AT 1,9;"MOVE ... =0: LET y=0: LET z=127: LET a=0: LET b=0: BORDER 1 ... : LET m=0
3010 PRINT #1;AT 1 ... -
Getting scr addresses from x and yCould someone please tell me how to calculate the 8 screen addresses corresponding to a character printed in basic at coordinates x and y? For examp…
... 0: LET y=0: LET z=127: LET a=0: LET b=0: BORDER 1 ... : LET m=0 ...
3010 PRINT #1;AT 1 ... INKEY$=" " THEN PRINT #1;AT 1,9;" ALTER SIZE ": ... THEN PRINT #1;AT 1,9;"MOVE SELECTION": LET m=0
... -
Question For The Emulator AuthorsWhy do $ED $44, $ED $4C, $ED $54, $ED $5C, $ED $64, $ED $6C, $ED $74, $ED $7C all disassemble to opcode NEG and $ED $45, $ED $55, $ED $5D, $ED $65, …
... where each bit opens (1) or closes (0) gates on the processor ... example) with bits 7 (=0), 6 (=1), 1 (=0) and 0 (=0). By ignoring 3 bits ... -
NMI : especially PitersHello Piters, here the link to your NMI-button. [url]http://members.tripod.com/~piters/nmibutto.htm[/url] I don't understand your reason to place …
... = iff2 = 0
EI: iff1 = iff2 = 1
NMI: iff1 = 0; call & ... -
Try this in google mapsTake 60 seconds to do this: 1. go to [url]www.google.com[/url] 2. click on "maps" 3. click on "get directions" 4. type " New York " in the firs…
... ;ll=55.030088,-1.510105&spn=0.043979,0.11673&om ... -
Reason for strange display layout?I have always wondered if there is any technical reason behind the strange layout of the display file or why did Sinclair choose to do it this way?
... start with BBSSSLLLCCCCC = 0, then repeatedly add 1. The CCCCC bits increases ... rightmost edge and adding 1 sets CCCCC = 0 (left edge) and a ... drop from char row 0 to char row 1 (a drop of ... = 111). Then adding 1 to LLL makes LLL = 0 (back to the ... -
Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…
... for the running with my 1 line snake game
1: LET v=0: LET sc=0: BORDER 1: CLS : PAPER 1: PRINT AT 0,0 ... ;"Score:",,: FOR n=1 ... TO 1000: PRINT AT 0,8 ... -
Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…
... 0: PAPER 0: INK 7: CLS : LET x=15: FOR f=0 TO 1 ... :
PRINT AT 0,x; INK 6 ... ;CHR$ 144: FOR g=0 ... TO s/99:
PRINT AT 21,RND*31; BRIGHT 1 ... )7: NEXT f: PRINT AT 0,0;"Score=";s:
INPUT "Press ... -
Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…
... 0:
PAPER 0: INK 7: CLS : LET s=1: FOR f=1 TO ... 1: LET p=9: LET a=1: LET b=1:
FOR f=0 ... TO 1: PRINT AT ... NEXT f:
PRINT AT 0,0;"Score=";s: INPUT "Press enter ... 254,254,254,254,254,0,
0,127,127,127,127 ... -
Game OptimisationBelow is a section of code Im using for movement enermy display and collision detect. What happens is that you move the sight with ,.qa and space do…
... br /> 85 PRINT AT 1,1;g
90 PRINT ... 0: LET f=INT (RND*21)+1
240 LET e=e+1 ... /> 280 POKE USR "A"+0,BIN 00011000
290 ... POKE USR "A"+1,BIN 00011000
300 ... /> 380 POKE USR "B"+0,BIN 00000000
390 ... f=INT (RND*21)+1: LET g=0
520 RETURN ... -
Game OptimisationBelow is a section of code Im using for movement enermy display and collision detect. What happens is that you move the sight with ,.qa and space do…
... engine (It maybe only 1 stroke at the mo ... INT (RND*21)+1: LET g=0: LET c=0
30 ...
50 PRINT AT 1,1;g
60 PRINT ... LET g=g+1: LET c=1: PRINT AT 1,1;g: GO ... ": LET e=0: LET f=INT (RND*21)+1: PRINT AT ... /> 300 POKE USR "B"+0,BIN 00000000
310 POKE ... -
Try this in google mapsTake 60 seconds to do this: 1. go to [url]www.google.com[/url] 2. click on "maps" 3. click on "get directions" 4. type " New York " in the firs…
... &ie=UTF8&om=1&layer=c&cbll ... ,-74.406761&cbp=1,234.924811093247,0.61024115755627,1&ll=40 ... .69795,-74.405594&spn=0.099562,0 ... -
Try this in google mapsTake 60 seconds to do this: 1. go to [url]www.google.com[/url] 2. click on "maps" 3. click on "get directions" 4. type " New York " in the firs…
... &ie=UTF8&om=1&layer=c&cbll ... ,-74.406761&cbp=1,234.924811093247,0.61024115755627,1&ll=40 ... .69795,-74.405594&spn=0.099562,0 ... -
Try this in google mapsTake 60 seconds to do this: 1. go to [url]www.google.com[/url] 2. click on "maps" 3. click on "get directions" 4. type " New York " in the firs…
... &ie=UTF8&om=1&layer=c&cbll ... ,-74.406761&cbp=1,234.924811093247,0.61024115755627,1&ll=40 ... .69795,-74.405594&spn=0.099562,0 ... -
Game OptimisationBelow is a section of code Im using for movement enermy display and collision detect. What happens is that you move the sight with ,.qa and space do…
... INT (RND*21)+1: LET g=0: LET c=0
25 ...
50 PRINT AT 1,1;g
60 PRINT ... LET g=g+1: LET c=1: PRINT AT 1,1;g: GO ... ": LET e=0: LET f=INT (RND*21)+1: PRINT AT ... /> 210 POKE USR "A"+0,BIN 00011000
220 ... /> 300 POKE USR "B"+0,BIN 00000000
310 POKE ... -
Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…
... /> 21 (Blackjack-variant)
1 LET B$="AJQK789T": LET c ... =32: LET A$="": FOR A=0 TO 2: P
OKE ... =7)-(t=3)*(e>0))*(v=m)*8: IF s ... -
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…
... />
[code]
m[0] = 'a'; // the first element in ... is at index 10-1=9
q[0] = &m ... address of the fourth char (0,1,2,3 remember) in ... the element m[0]. The next line adds 1 to the ... the array, would contain the 0 byte. Using the declaration " ... -
Yesteryear's Computers.Ahhhh ... [URL="http://www.computerworld.com/action/article.do?command=printArticleBasic&articleId=9023960"]back in the day[/URL] when a 300mb system…
... I'd be seeing 1's and 0's in my sleep ... /> Lets see:
2.1 Gig HD
CD ROM ... -
Yesteryear's Computers.Ahhhh ... [URL="http://www.computerworld.com/action/article.do?command=printArticleBasic&articleId=9023960"]back in the day[/URL] when a 300mb system…
... I'd be seeing 1's and 0's in my sleep ... /> Lets see:
2.1 Gig HD
CD ROM ...
